Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 37, Issue 1
Displaying 1-50 of 62 articles from this issue
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  • The Decay of 76Br
    Teruaki Nagahara, Jian-zhi Ruan (Gen), Hiroshi Nakayama, Yasuhiro Ishi ...
    1974 Volume 37 Issue 1 Pages 1-9
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.1
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    The decay of 76Br was investigated using a spectrometer of a Ge(Li) detector placed at the center of a large annular NaI(T1) crystal, which was used either as a Compton suppression spectrometer or as a pair spectrometer. The energies and relative intensities of 103 gamma rays were determined from the singles gamma-ray spectrum. Gamma-gamma coincidence experiments were performed with Ge(Li)–NaI(T1) detectors. Of the observed transitions, 96 are placed in a decay scheme with 32 excited levels in 76Se at 559.1, 1122.3, 1216.1, 1330.9, 1689.0, 1787.8, 2127.6, 2171.1, 2374.0, 2429.2, 2515.4, 2629.1, 2655.6, 2670.2, 2950.5, 3069.8, 3160.1, 3351.0, 3459.7, 3556.5, 3604.0, 3669.0, 3913.1, 3929.0, 3970.5, 4020.2, 4084.4, 4172.6, 4198.8, 4215.7 and 4604.1 keV.
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  • Decay of 154Pm to Levels of 154Sm
    Hiroshi Yamamoto, Kiyoshi Kawade, Hiroyasu Fukaya, Toshio Katoh
    1974 Volume 37 Issue 1 Pages 10-16
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.10
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    Decay of 154Pm isomers has been studied with Ge(Li), NaI(Tl) and plastic detectors. Sources were prepared by the 154Sm(n, p)154Pm reaction with about 15 MeV neutrons. Seventy-five γ-rays have been observed and 57 of them are assigned to the 154Sm level scheme including four new levels at 1815.8, 1879.3, 2592.3 and 2618.8 keV. Observed Qβ values were 3.9±0.2 MeV. Most probable spin assignments of 0± or 1± and 3± or 4± are proposed for the 1.7±0.2 min and 2.9±0.2 min 154Pm, respectively.
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  • Photoprotons from 27Al
    Hiroaki Tsubota, Nobuaki Kawamura, Siro Oikawa, Katsufusa Shoda
    1974 Volume 37 Issue 1 Pages 17-23
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.17
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    Proton energy spectra of the 27Al(e, e′p)26Mg reaction in the giant resonance region have been measured at 90°. The (γ, p0) and (γ, p1) differential cross sections were obtained. A strong proton group is found at 8.5 MeV in the energy spectra with the electron energies above 22 MeV. This proton group is found to be due to non-ground state transitions. The integrated differential cross sections of the (γ, p0) and (γ, p1) reactions are obtained as 0.45±0.06 and 0.92±0.21 MeV-mb/sr, respectively. The results are compared with those for the neighbouring closed nucleus 28Si. A discussion is made on a direct process. The splitting of the (γ, p0) resonance is studied, and an effect of the isospin rather than the nuclear deformation is suggested.
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  • Statistical Thermodynamics of Ternary Solutions
    Masaji Onodera
    1974 Volume 37 Issue 1 Pages 24-35
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.24
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    The asymptotic method established in the theory of binary solution is applied to ternary solutions. The configurational partition function is obtained for the system containing molecules of simple structure. It provides improved relations for excess heat capacity and heat of mixing, as a function of temperature and volume fractions. They are compared with existing expressions of the thermodynamic functions.
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  • Hydrostatic Pressure Effect on the Superconducting Transition Temperature and the Transport Properties of NbSe2
    Kazuhiko Yamaya
    1974 Volume 37 Issue 1 Pages 36-43
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.36
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    Pressure dependence of the superconducting transition temperature, Tc, the electrical resistivity, ρ, and of the Hall coefficient, RH, in the layered compound NbSe2 were measured. A low-temperature phase was found to be stable in a range of temperature below 26 K and of pressure below 1 kb, with Tc=7.16 K and negative sign of RH, while Tc of the high temperature (2H) phase is 7.35 K and RH being positive in sign. It is concluded, contrary to the current idea, that changes in the intralayer parameters are important in explaining the behavior of Tc, ρ, and RH under pressure, at least equally to the change in the van der Waals gap distance in layered compounds.
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  • Stochastic Approach to Nonlinear Chemical Reactions Having Multiple Steady States
    Ken’ichi Nishiyama
    1974 Volume 37 Issue 1 Pages 44-49
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.44
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    A stochastic approach is carried out to nonlinear chemical reactions having multiple steady states. The reaction processes are assumed to be Markovian and normal approximation is adopted. It is shown that the steady states and their stability conditions are the same as those obtained from the deterministic approach when the volume of the system is large compared with order 1. Furthermore it is obtained from the machine calculation that even if the volume is large the transition from an initial state near the unstable steady state to the stable one is not always possible. And there seems to be a sort of threshold. If the state is too close to the unstable steady state, then the fluctuations of the chemical substances become divergent and the transition can not be seen. When the the transition is possible, the fluctuations will pass through a maximum on the way.
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  • Magnetic Properties of Manganese(II) Phthalocyanine
    Hirokazu Miyoshi
    1974 Volume 37 Issue 1 Pages 50-56
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.50
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    The canted ferromagnetism of manganese(II) phthalocyanine (PcMn) was studied by torque and magnetization measurements. The experimental results were interpreted in terms of a two sublattice-four domain model. Below the Curie temperature, the magnetic moments on two sublattices which form ferromagnetic linear chains are aligned nearly along the molecular axes and make an angle about 90° with each other resulting in the canted ferromagnetism. This spin structure gives four kinds of domain as observed in the torque measurement. From the analysis on the basis of the molecular field approximation the large and negative crystalline field parameter, D, was found to be responsible to the spin structure in PcMn.
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  • Temperature and Frequency Dependences of Line Width of Antiferromagnetic Resonance in Europium Telluride
    Satoru Kunii, Sadamichi Maekawa, Eiji Hirahara
    1974 Volume 37 Issue 1 Pages 57-62
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.57
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    EuTe is a second kind f.c.c. antiferromagnet. The line width of the antiferromagnetic resonance of the single crystal has been measured at frequencies of 9.20, 22.12, and 33.99 GHz in the temperature range of 1.25 4.20 K. The measurements have been performed on the spin-flop mode with the resonance field applied in the easy plane (111). The results show that the temperature depends of the line width strongly depends on the used frequency. The line width at 9.20 GHz increases with temperature as exp (−5⁄T), the one at 22.12 GHz increases linearly with T, and at 33.99 GHz it increases very slowly with T. The essential behavior of the temperature and frequency dependences is theoretically explained in terms of the three-magnon process derived from the exchange interaction.
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  • Magnetic Properties of FeCl2-Graphite Compounds. Mössbauer Effect and Magnetic Susceptibility Studies
    Kentaro Ohhashi, Ikuji Tsujikawa
    1974 Volume 37 Issue 1 Pages 63-70
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.63
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    Mössbauer spectra and magnetic susceptibilities χ of the 1st and the 2nd stage FeCl2-graphite compounds are reported. The spectra at 80 and 300 K indicated that both stage compounds have two different Fe2+ ion sites (FeI and FeII) with dissimilar distortions from a regular octahedron of chlorines. Their spectra at 1.5 and 4.2 K were explained in terms of internal fields Hn along the c-axis at both sites and the temperature dependence of χ below 77 K was interpreted by weakly anisotropic triangular-layer ferromagnets with an effective spin S′=1. The obtained values of Hn, quadrupole splittings, isomer shifts and anisotropy of χ are discussed and compared with those of anhydrous FeCl2. The FeII site ions having the same crystal field as in the anhydride (with the doublet ground state) are presumed to induce spin polarizations of the FeI site ions (with the singlet one) along the c-axis via exchange fields.
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  • Influence of Impurities on the Temperature Dependence of Spin Cluster Resonance Intensity
    T. de Neef
    1974 Volume 37 Issue 1 Pages 71-72
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.71
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    The temperature dependence of spin cluster resonance signals can be used to calculate the dominant exchange interaction in chainlike structures. It is shown that impurities in the sample can result in a drastic change of the calculated value of the exchange. The results are applied to the case of CsCoCl3·2H2O.
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  • NMR of Non-Transition Impurities in Transition Metals and Alloys
    Naoki Yokoyama, Yoshihiro Yamada, Shohtaro Kohzuki, Kunisuke Asayama
    1974 Volume 37 Issue 1 Pages 73-76
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.73
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    Nuclear spin-lattice relaxation times, T1’s of Al27, Sn119 and Cu63 dissolved in transition and non-transition metals and alloys are measured. T1’s of Al and Sn are enhanced in transition metals, Whereas T1 of Cu in transition metals does not change appreciably. The result is explained well by Terakura and Kanamori’s theory.
    The Knight shifts in some of the alloys are also measured and the results are discussed.
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  • Band Structure and Band-Gap Effects for Photoelectron Spin Polarization of Ferromagnetic Metals
    Tsuyoshi Murao
    1974 Volume 37 Issue 1 Pages 77-84
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.77
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    The electron spin polarization (ESP) in photoemission is investigated on the basis of a one-dimensional model for ferromagnetic metals in order to elucidate the band structure and the band-gap effects for this problem. Discussion is particularly made about the exchange splitting and the difference of related matrix elements for up and down spin electrons. It is shown that the surface effect involved both in the interband transition and in the transition to the gap states, which is of a nondirect nature, is important for positive ESP. ESP of Ni metal is briefly discussed in connection with the present model.
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  • Angular Correlation of Photons from Positron Annihilation in Copper-Nickel Alloys
    Masayuki Hasegawa, Toshiharu Suzuki, Makoto Hirabayashi
    1974 Volume 37 Issue 1 Pages 85-91
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.85
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    Angular correlation measurements of radiation from positrons annihilating in copper-nickel alloys have been carried out with crossed-slit geometry using single crystals containing less than 73 at % Ni. The neck radius of the Fermi surface decreases linearly with increasing nickel content, but the neck does not detach from the hexagonal zone face even at the highest nickel content. No marked change in the composition dependence of neck radius is observed at the magnetic phase boundary near 70% Ni. The neck radius of paramagnetic nickel is estimated to be about 0.13 in unit of that for copper from the extrapolation of the observed data.
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  • Dielectric Properties of GdDy(MoO4)3
    S. N. Das
    1974 Volume 37 Issue 1 Pages 92-94
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.92
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    The properties of GdDy(MoO4)3 were measured at microwave and lower frequencies. The measured permittivity and the loss tangent of GdDy(MoO4)3 are 6.6±0.2 and 0.0017 from 8.78 to 12.26 GHz. The permittivity at 12.26 GHz was found to be substantially independent of temperature from 23°C to 180°C. The permittivity of GdDy(MoO4)3 is reduced by 13% of its zero bias value at 159°C by a bias field of 8.3 kV/cm at 1 kHz.
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  • Mechanism of Resistivity Decrease of N-Type InSb by Millimeter Microwave Irradiation
    Kohzi Yamada, Tadashi Sekiguchi
    1974 Volume 37 Issue 1 Pages 95-103
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.95
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    The phenomenon that the overall electrical resistivity of InSb decreases significantly with the irradiation of 4 mm microwave has been observed in the temperature region from 1.7 to 4.2 K and in the presence of externally applied magnetic field up to 18 kG. The experimental results have been analysed on the basis of the two-band model. It is concluded that the significant decrease in the resistivity can be attributed, to the increase in the carrier concentration of the conduction band which arises from the impact-ionization of donors by hot-electrons in the conduction band. The possibility that the photo-conduction by hot-electrons or the photo-ionization of donors plays a dominant role is almost entirely excluded.
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  • Measurements of the Reflectivity of Single Crystal Ag2F at Room Temperature
    Hiizu Fujita, Yoshio Okada, Haruki Kawamura, Ichimin Shirotani, Hiroo ...
    1974 Volume 37 Issue 1 Pages 104-107
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.104
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    Optical reflectivity spectrum of silver subfluoride, Ag2F, is measured from 9,000Å (1.377 eV) to 3,000Å (4.132 eV) at room temperature. The spectrum shows typical metallic features which are expected from Drude’s classical free electron theory in metal; the reflectivity is fairly high and constant against wavelength in the long wavelengths region, while it decreases rapidly, almost to zero, at the specific wavelength which is known as “the UV window”. The optical constants are calculated from the reflectivity spectrum, and the real part of the complex dielectric constant is found to be zero at the photon energy of 2.572 eV (4,520Å); which is the plasma criterion of the free electron gas in the metal.
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  • On the Higher Interband Electro-Reflectance Structure Observed around 3.37 eV in GaSe
    Yoshihiko Suzuki, Yoshihiro Hamakawa
    1974 Volume 37 Issue 1 Pages 108-113
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.108
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    Electro-reflectance spectra of GaSe in the photon energy region from 3.32 to 3.44 eV have been precisely explored to identify the origin of new absorption peak at 3.37 eV at 90 K, which is currently observed unidentified elsewhere. The electro-optical spectra taken by the applied field parallel and perpendicular to c-axis have been examined by comparing three possible transition processes on this edge. As a result of systematic analysis of the structure, this edge is attributed to the transition at an excitonic M1 critical point.
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  • New Cyclotron Resonance Absorption Peaks in Germanium under High Excitation
    Eizo Otsuka, Tyuzi Ohyama, Toshi Sanada
    1974 Volume 37 Issue 1 Pages 114-121
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.114
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    New absorption peaks are observed in time-resolved cyclotron resonance for germanium under a fairly high excitatin. They are associated with proper cyclotron resonance signals in a systematic way. Characteristic behavior of these peaks is described in detail. A tentative interpretation of the phenomenon in terms of the idea “excitonic polaron” is attached.
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  • Studies on Ag− Centers in Alkali Halides. V. Ag−(Na)2 Centers
    Kazuko Kojima, Yoshiko Doi, Tadanobu Kojima
    1974 Volume 37 Issue 1 Pages 122-129
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.122
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    In addition to the previously known Ag−(Na)2 centers of D4h symmetry, another type of Ag−(Na)2 center which has C2v symmetry is discovered in KCl, KBr and RbCl. Absorption and emission spectra, decay time of the emission, and degree of polarization for the emission are measured on the two types of Ag−(Na)2 centers. Anomalous emission having a large Stokes shift is found in the Ag−(Na)2 center of C2v symmetry. A semi-empirical calculation of the energy levels is also performed.
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  • Resistance changes Induced by Electron Spin Resonance and Spin Relaxation in Phosphorus-Doped Silicon
    Seizo Toyotomi
    1974 Volume 37 Issue 1 Pages 130-139
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.130
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    Phosphorus-doped silicon in the intermediate concentration range of impurity conduction exhibits a decrease in dc resistance with occurrence of ESR at low temperatures. This phenomenon is caused by the conversion of spin energy absorbed at ESR into the kinetic energy of carriers. The carriers are here mobile electrons which are excited thermally to the delocalized states characterized by the activation energy ε2. The experimental characteristics of this phenomenon are elucidated by studying the non-ohmic properties at high electric fields. The rate at which the absorbed spin energy is transferred to the lattice via the electron kinetic energy is determined. The spin relaxation process of this type is shown to become predominant with increasing donor concentration in the semiconductor-metal transition range.
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  • Electrical Resistivity and Hall Effect of ZnCr2Se4
    Tsuneo Watanabe
    1974 Volume 37 Issue 1 Pages 140-144
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.140
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    Measurements of the electrical resistivities, the Seebeck effects, and the Hall effects were performed on the doped and un-doped single crystals of ZnCr2Se4 between 77 and 380K. The influence of heat treatments on the electrical properties are studied and the results are given. Measurement of the Hall effects and the Seebeck effects indicate that all samples investigated are p-type. The hole mobility of these samples is small (order of 100 cm2/Vsec) and independent of temperature while hole concentrations are cosiderably affected by doping or annealing and are temperature dependent. The above results for these ZnCr2Se4 crystals are discussed in connection with deviation of stoichiometry in these single crystals.
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  • Electric Field Effect on the ESR of Gd3+ in SrTiO3
    Hiromi Unoki, Tunetaro Sakudo
    1974 Volume 37 Issue 1 Pages 145-152
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.145
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    The electric field effect of the electron spin resonance for Gd3+ located at the Sr site of SrTiO3 has been studied. The general characteristics of the induced effect was explained by a polarization-induced spin Hamiltonian of the D2d point symmetry. The induced diagonal splitting was found to be due to the purely rhombic term produced in the c-plane. The values of T11−T12 and T66 were calculated from the induced shift. Furthermore, the directions of c-axes for each domains were changed by the applied electric field. The c-axis canting was explained as due to the R15 term which remarkably varied with temperature and vanished above T≈65 K. These experimental results were analysed and discussed in several respects.
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  • Nucleation Model for Domain Wall Motion in Rochelle Salt
    Gyoichi Nogami
    1974 Volume 37 Issue 1 Pages 153-155
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.153
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    The switching transient in Rochelle salt was reinvestigated with respect to the domain wall motion. The results showed that the wall velocities were characterized by the two types of activation fields, δ and α at low and intermediate fields, respectively. The relationship α=2δ is nearly satisfied throughout the ferroelectric phase. The result was analyzed in terms of the “layer by layer” advancement of the wall in the nucleation model. The result indicates that the nucleation model can also be applied for Rochelle salt.
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  • Molecular Motion in CsH(CHCl2COO)2 as Studied by 35Cl Nuclear Quadrupole Resonance and Dielectric Measurements
    Hideaki Chihara, Nobuo Nakamura
    1974 Volume 37 Issue 1 Pages 156-162
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.156
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    35Cl nuclear quadrupole resonance study was carried out on CsH(CHCl2COO)2. The Zeeman effect experiment showed that this crystal belongs to a triclinic system with two crystallographically nonequivalent dichloroacetate anions. From the measurement of the temperature dependence of the resonance frequencies and the spin-lattice relaxation times of all the four resonance lines it was found that the CHCl2 groups in one of the two carboxylate anions undergo internal rotation about C–C bonds below room temperature with the activation energy of 3.97 kcal/mol. Dielectric behavior was consistent with the motion. The nuclear quadrupole resonance frequencies of 17 other chloroacetates are also reported.
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  • Paramagnetic Torque and Crystallographic Domain Distributions in an Iron Iodine Boracite Single Crystal
    Munetaka Haida, Kay Kohn, Jinzo Kobayashi
    1974 Volume 37 Issue 1 Pages 163-166
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.163
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    Paramagnetic torque in an iron iodine boracite single crystal was measured in the temperature range between 30 K and 358 K. The observed torque curves were analysed by phenomenological treatment based on a possible domain distribution in a crystal. The ratio of the volumes of different kinds of domains were estimated from the results for the crystal before and after an electric field annealing. Anomalies in the temperature dependence of torque were observed at the crystallographic transitions. A large thermal hysteresis in the orthorhombic rhombohedral transition previously observed in the lattice strain measurement was reconfirmed.
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  • Study on the Ferroelectric Phase Transition in RbDSO4 by NMR. I. Deuteron Magnetic Resonance in Paraelectric Phase
    Masaru Kasahara, Itaru Tatsuzaki
    1974 Volume 37 Issue 1 Pages 167-170
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.167
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    The angular dependence of first order quadrupole shifts about three mutually perpendicular axes is measured at 20°C and is analysed by Volkoff method. Quadrupole coupling constants at two symmetrically inequivalent sites are 171.5±2.0 kHz in the hydrogen bond of 2.613 Å in length and 167.7±2.0 kHz in the other one of 2.712 Å in length. The directions of the principal axes of electric field gradient are discussed in connection with the position of deuterium in the hydrogen bond. It is concluded that the deuterium is not in a disordered state, but in fact stays on acentric position in each hydrogen bond even in the paraelectric phase.
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  • Effect of Weak Dislocation Potential on Nonlinear Wave Propagation in Anharmonic Crystal
    Kimiaki Konno, Wataru Kameyama, Heiji Sanuki
    1974 Volume 37 Issue 1 Pages 171-176
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.171
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    The wave propagation in an infinite one-dimensional anharmonic lattice is studied under the influence of an anharmonic potential and a weak dislocation potential. It is found that the equation for the nonlinear wave propagation has N-kink solution. The properties of one and two kink solutions are discussed in detail. It is also found that there exists the critical eigenvalue due to the competition between the above two kinds of potentials. A few conservation laws are obtained.
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  • Theory of the Optical Property of Visual Pigment
    Hideo Suzuki, Toshiro Komatsu, Hiroki Kitajima
    1974 Volume 37 Issue 1 Pages 177-185
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.177
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    Under the assumption that retinal forms a protonated or unprotonated Schiff-base binding with opsin, the effect of the electrostatic interaction between retinal and opsin on the optical property of visual pigment is investigated, using the π-electronic states determined previously with a due account of both σ-π interaction and configuration interaction.
    It is shown that the wide distribution of the observed wavelengths of absorption maximum of visual pigments can reasonably be explained by both the protonated Schiff-base binding and the electrostatic interaction of retinal with opsin. Furthermore, the origin of the electrostatic interaction is shown to be ascribable to one counter ion such as COO− at the vicinity of the protonated Schiff-base binding.
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  • Cooling Effects of CO2, CO2–N2 and CO2–He Gases by Absorption of Q-Switched Laser Radiations
    Htin Aung, Keiichi Nagai, Mikio Katayama
    1974 Volume 37 Issue 1 Pages 186-192
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.186
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    Transient cooling of CO2 and mixtures of CO2–N2, CO2–He was investigated in the pressure range of range of 5–460 Torr, using different wavelength radiations of the CO2 laser, i.e. the P and R branches of 10.6 μm and 9.6 μm radiation. Temperature variations of the irradiated gases were detected by a condenser microphone through the pressure changes. Observed experimental results are explained, based on the variation of the vibrational relaxation times of the CO2 molecule under different physical conditions.
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  • Amplification of Sound Waves in Partially Ionized Gases
    Masaaki Hasegawa
    1974 Volume 37 Issue 1 Pages 193-199
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.193
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    The behavior of the sound wave in a positive column of grow discharge is investigated experimentally.
    When the sound wave propagates in the positive column, the amplification of the sound wave is observed. The growth rate of the amplitude and the phase velocity are increased with the discharge current. When the discharge tube is cooled down to the liquid nitrogen temperature, the growth rate increases three times as much as that in the room temperature.
    The experimental results suggest that the sound wave is unstable in the grow discharge.
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  • Effects of Toroidal Magnetic Field on an Annular Plasma
    Yoshiomi Kondoh, Shigeru Okamura, Shigeo Nagao, Masaru Masuzaki
    1974 Volume 37 Issue 1 Pages 200-205
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.200
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    An experimental investigation on some effects of the toroidal magnetic field on an annular plasma produced by a modified hard-core θ-pinch is described. The length of the annular plasma could by varied by a pair of end coils. A high speed camera, a floating double probe and a magnetic probe were used for the investigation. The experimental results show that the toroidal magnetic field has some effects to suppress the macroscopic instabilities, such as the positional instability, and the axial contraction of the annular plasma, where the former was observed in the case with the shorter annular plasma and the latter in the case with the longer one when the toroidal field was not applied.
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  • Exact Multisoliton Solutions for Three-Wave Interactions of Bernstein Modes
    Kazuhiro Nozaki
    1974 Volume 37 Issue 1 Pages 206-208
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.206
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    A set of equations with group velocity dispersion for the three-wave interaction among the Bernstein modes is reduced to the Sine-Gordon equation provided that two of three interacting modes have the same group velocity, and exact multisoliton solutions for the three interacting modes are obtained.
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  • Preliminary Experiments on the Plasma Equilibrium with a Three-Dimensional Magnetic Axis (Asperator-K)
    Kazuyoshi Koyama, Yasuo Suzuki, Shigeo Nagao
    1974 Volume 37 Issue 1 Pages 209-213
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.209
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    Preliminary experiments with Asperator-K which has a three dimensional magnetic axis are reported. The plasma column was confined in a magnetic field of 90°-toroidal sector with a helical axis which had nε≅0.8 where n is the number of periods around the torus and ε is the ratio of the amplitude of the helix of the magnetic axis to the major radius of the torus R. The measured rotational transform angle was (0.8±0.2)π per period. The stabilization effect by the end plates was not observed. The displacement of the plasma column was −0.5 cm with respect to the direction of the principal normal of the magnetic axis. This value is not far from the theoretical prediction.
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  • Instability of Flow of Two Horizontal Fluid Layers Due to Interfacial Waves
    Choji Nakaya, Eiji Hasegawa
    1974 Volume 37 Issue 1 Pages 214-222
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.214
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    The linear stability of two immiscible viscous flowing between horizontal planes is studied, the gravity and the surface tension being taken into account. The gravity and the surface tension have an important role at small Reynolds number. In particular, the former is effective for small wave number. If the upper fluid is heavier than the lower fluid, the gravity destabilizes the flow, while the surface tension stabilizes it. The instability is suppressed above some value of the wave number for small Reynolds number limit. If the upper fluid is lighter, the gravity stabilizes the flow. Interfacial waves exist for some definite interval of the depth ratio of the fluids.
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  • Steady Radiative Heat Transfer from a Point Heat Source in a Uniform Flow of an Optically Thick Gas
    Syozo Kubo
    1974 Volume 37 Issue 1 Pages 223-228
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.223
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    This paper deals theoretically with the steady radiative heat transfer from a point heat source in a uniform flow of an optically thick gas. The gas is assumed to be grey, inviscid, non-heat conducting and the radiation field to be in local thermodynamic equilibrium. The Mach number is assumed to be small and the intensity of the heat source is assumed to be weak. Thus the analysis is based on the linearized equations. The point heat source is considered as a limit of a black sphere whose radius tends to zero and whose temperature tends to infinity to give a finite effect to the radiation field. A method of solution is developed in which the diffusive asymptotic field and the radiation region adjacent to the heat source are considered successively. The spherical symmetric radiation region is studied in detail. Numerical discussions are also made of the distribution of the temperature in the radiation region.
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  • Slow Motion of a Spherical Cap in a Viscous Fluid. I. Uniform Translation and Rotation
    Hideaki Takagi
    1974 Volume 37 Issue 1 Pages 229-236
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.229
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    An exact solution is obtained for the slow viscous flow caused by the translation of a spherical cap with constant velocity perpendicular to its axis of symmetry. The velocity and pressure fields are found by solving three pairs of dual series equations in associated Legendre functions. In particular, the forces on the cap are obtained in a finite from. Also is considered the steady rotation of a spherical cap about the line perpendicular to the axis of the cap.
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  • Slow Motion of a Spherical Cap in a Viscous Fluid. II. Free Suspension in a Shear Field
    Hideaki Takagi
    1974 Volume 37 Issue 1 Pages 237-239
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.237
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    The exact solution of the Stokes equations for the creeping motion of a spherical cap arbitrarily oriented with respect to a shear field is obtained through an application of dual series equations. Under the condition of zero torque and force on the cap, the linear and angular velocities gained by the cap are calculated as a function of its semiangle.
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  • Hall Effects in Magnetogasdynamic Flows of Finite Conductivity past a Wedge Profile
    Shoji Kitamura, Takao Yoshikawa, Shigeki Morioka
    1974 Volume 37 Issue 1 Pages 240-248
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.240
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    A steady flow of an ideal gas past a thin wedge profile in an aligned magnetic field is considered for arbitrary magnetic Reynolds number, Hall parameter, Mach number, and Alfvén Mach number, within the linearized theory. The flow field near the obstacle is found by the numerical integration of the Fourier transfrom. The outer flow is estimated by the method of asymptotic expansion. Particular attention is placed on the transition of the flow field as the Hall parameter increases from zero to infinity for a given magnetic Reynolds number. Then, the MHD boundary layer and the MHD shock layer are dispersed away, and the flow field tends to the ordinary gasdynamic one after the intermediate state with wavy aspects. Several predictions are provided about the observation of a standing MHD shock wave.
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  • Secondary Flow around an Oscillating Cylinder
    Ko Tamada, Tosio Miyagi
    1974 Volume 37 Issue 1 Pages 249-253
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.249
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    This paper deals theoretically with the two-dimensional flow driven by a symmetrical Joukowski profile oscillating harmonically along its axis of symmetry in an unbounded viscous fluid otherwise at rest. Slow steady secondary flow which occurs outside the boundary layer around the profile is studied in detail. It is found that a uniform flow is induced at infinity owing to the asymmetry of the profile in the direction of oscillation.
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  • Attractive Force Due to the Impulsive Start of Two Parallel Plates
    Akira Yoshizawa
    1974 Volume 37 Issue 1 Pages 254-259
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.254
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    An analysis is made of an attractive force experienced by two equal parallel plates which start impulsively with constant velocity parallel to themselves. The flow in the initial period is investigated on the basis of the Navier-Stokes equations. The present analysis concludes that in the initial period each plate experiences an attractive force, irrespective of the usual Reynolds number based on the constant velocity and the length of the plates, at least when the distance between them is large compared with the length.
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  • Laminar Viscous Flow past a Flat Plate with Finite Thickness
    Akira Yoshizawa, Moon Uhn Kim
    1974 Volume 37 Issue 1 Pages 260-263
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.260
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    A study is made of laminar viscous flow past a semi-infinite flat plate with finite thickness, set parallel to a uniform stream. An asymptotic solution of the Navier-Stokes equations is constructed on the basis of high-Reynolds-number approximations. The total drag coefficient CD for a flat plate of thickness 2a immersed in a uniform flow U is shown to be given by
    (Remark: Graphics omitted.),
    where R=Ux*⁄ν and x=x*⁄a (x* being the distance along the plate and ν the kinematic viscosity).
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  • Refined Time Law of One-Dimensional Liesegang Phenomena
    Shouji Shinohara
    1974 Volume 37 Issue 1 Pages 264-272
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.264
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    In the previous paper (J. Phys. Soc. Japan 29 (1970) 1073) a mechanism of one-dimensional Liesegang phenomena was investigated. The discussion was based on the assumption that sol zones are made in a discrete form and the flocculation proceeds with two steps.
    In the present paper this theory is revised to take reaction heat, concentration dependence of the diffusion coefficient, and the retardation of the observed flocculation into consideration. We obtained a revised time law which can explain quantitatively the experiments. The retardation seems to give the time taken for the coagulation with two steps.
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  • Strong Paramagnetism in ZrMnCo
    Yuko Fujita
    1974 Volume 37 Issue 1 Pages 273
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.273
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  • Studies of the Hyperfine Field at Bi in a Ferromagnetic BiMn by Low Temperature Nuclear Orientation
    Hiroko Koyama, Nobuhiko Nishida, Kanetada Nagamine, Toshimitsu Yamazak ...
    1974 Volume 37 Issue 1 Pages 274
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.274
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  • Magnetic Structure of the Cubic Perovskite Type SrMnO3
    Takayoshi Takeda, Soji Ohara
    1974 Volume 37 Issue 1 Pages 275
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.275
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  • Structure and Properties of CsFeBr3
    Yasuo Takeda, Masahiko Shimada, Fumikazu Kanamaru, Mitsue Koizumi
    1974 Volume 37 Issue 1 Pages 276
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.276
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  • Spin Wave Resonance in Thin Films of MnSb1−xSnx
    Mituru Hashimoto, Hideo Ishii, Kenjiro Kambe
    1974 Volume 37 Issue 1 Pages 277
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.277
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  • Phonon Thermal Conductivity in Superconducting Ta and Ta–Nb Alloys below 1 K
    Manabu Ikebe, Norio Kobayashi, Yoshio Muto
    1974 Volume 37 Issue 1 Pages 278
    Published: July 15, 1974
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.278
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  • Thermal Conductivity Minimum of Niobium in Mixed State
    Akio Oota, Takayoshi Mamiya, Yoshika Masuda
    1974 Volume 37 Issue 1 Pages 279
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.279
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  • Low Temperature Behaviour of Δτsn for Pb Single Crystal
    Eiichi Kuramoto, Fumio Iida, Shin Takeuchi, Taira Suzuki
    1974 Volume 37 Issue 1 Pages 280
    Published: July 15, 1974
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.37.280
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