Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 28, Issue 3
Displaying 1-50 of 55 articles from this issue
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  • Study of the Excited States in 4He through the 4He(γ, p)3H Reaction
    Junpei Sanada, Mikio Yamanouchi, Nobuhiko Sakai, Seiji Seki
    1970 Volume 28 Issue 3 Pages 537-541
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.537
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    Proton spectra from the 4He(γ, p)3H reaction with 32 MeV bremsstrahlung X-rays were measured at 45°, 90° and 135° lab angles. Two broad peaks were found at 24 and 27 MeV, and a local minimum at 26 MeV in the excitation function. The sin2θ angular distribution at the two peaks suggests that the reaction proceeds mainly through E1 absorption. An analysis of the data in terms of two non-interfering resonances shows that the lower 1− T=1 state at 25 MeV in 4He is mainly a 1P1 configuration.
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  • Note on the Third Excited Level of 200Hg
    Mitsuo Sakai, Hirokane Kawakami, Kazuo Saito
    1970 Volume 28 Issue 3 Pages 542-545
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.542
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    Internal conversion lines in decay of 200Tl have been measured with a large air-core spectrometer. The spin assignment for the third excited 1029-keV level of 200Hg is discussed mainly based on the multipolarity of the 661-keV transition from this level to the first 2+ level. It was found to be of almost pure E2 character from the experimental L-subshell line ratios. The spin and parity of the level are concluded to be most likely 0+. The internal conversion measurement of the 1029-keV line with high resolution showed the presence of a doublet of 1027.13-keV and 1029.21-keV lines. The monopole strength parameter of the 1029-keV E0 transition is estimated to be 0.53×10−2≥ρ.
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  • Rotational Levels in 167Tm and 171Lu
    Hiroshi Noma, Tokushi Shibata, Yasukazu Yoshizawa
    1970 Volume 28 Issue 3 Pages 546-555
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.546
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    Gamma-rays and internal conversion electrons from the 165Ho(α, 2n) 167Tm and 169Tm(α, 2n) 171Lu reactions were studied with a Ge(Li) detector and a beta-ray spectrometer. Excitation curves of these reactions were measured in the alpha-particle energies from 22 to 25 MeV.
    Rotational levels in the K=1⁄2+ ground-state band of 167Tm and the K=7⁄2+ ground-state band of 171Lu were assigned up to 23/2+ and 17/2+ levels, respectively.
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  • Electric Quadrupole Field in ‘HfOCl2·8H2O’ Crystals
    Vikram Singh, I. M. Govil, H. S. Hans
    1970 Volume 28 Issue 3 Pages 555-558
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.555
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    The perturbed angular correlation of 133–482 keV cascade in Ta181 has been measured with the source in the form of HfOCl2·8H2O crystals with magnetic fields up to 20 kG. The experimental values of G2 and G4, when compared with the theoretical values of Abragam and Pound, give the quadrupole interaction frequency ωE0=(118±20) Mc/s. The experimental values obtained under the presence of external magnetic field show the effect of time dependent fields present in this crystal.
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  • Influence of Magnetic Field on the Brownian Motion of Charged Particle
    Hisamoto Furuse
    1970 Volume 28 Issue 3 Pages 559-564
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.559
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    The Brownian motion of a charged particle in a magnetic field has been studied theoretically on the basis of the Langevin equation in an external field of force. In the case when the changed particle is located in a fluid in the presence of a stationary magnetic field, the square root of the mean of the squares of displacements has been expressed concerning with the charge and the field strength in the diffusion process of the arbitrary time interval following after the methods of the calculation in the theories of Ornstein-Uhlenbeck and Fokker-Planck. The spectral density of the velocity process has been obtained by the Fourier transform of its covariance.
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  • The Magnetic Anisotropy of Iron-Nickel (50–50) Thin Film Induced by Neutron and α-Particle Irradiation
    Nobuaki Tamagawa, Susumu Harasawa
    1970 Volume 28 Issue 3 Pages 564-569
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.564
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    Measurements of the magnetic anisotropy induced by irradiation of reactor neutrons or 1.47 MeV α-particles at 563°K in a magnetic field of about 2000 Oe were made on the evaporated Fe–Ni (50%–50%) thin films of single and polycrystalline structures. The observed induced uniaxial anisotropy was a few times larger than that of the bulk alloys. The temperature dependence of this anisotropy was measured at temperatures from 77°K to 663°K and fits quite well with the third power of the magnetization. Above 573°K, the magnetic anisotropy decreases with increasing temperature and time of heat treatment. The temperature dependence is well described by assuming the activation energies of 0.55 eV between 573°K and 773°K and 2 eV about 773°K.
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  • Interband Effects on Magnetic Susceptibility. II. Diamagnetism of Bismuth
    Hidetoshi Fukuyama, Ryogo Kubo
    1970 Volume 28 Issue 3 Pages 570-581
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.570
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    The magnetic susceptibility of conduction electrons in the presence of spin-orbit interaction is calculated. The model is that due to Wolff which assumes two bands separated by a small energy gap. Our calculation shows that due to the interband effect of the magnetic field the susceptibility has a large contribution to diamagnetism when the Fermi energy lies in the band gap region. This result is applied to bismuth, and possible interpretations are proposed for the dependence of its magnetic property on the effective valence number and the cause of the anisotropy.
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  • Exchange Anisotropy in Single Crystals of Cu–Mn Alloys
    Takao Iwata, Kenzô Kai, Takurô Nakamichi, Mikio Yamamoto
    1970 Volume 28 Issue 3 Pages 582-589
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.582
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    Low-temperature magnetic measurements have been carried out on the field-cooled single crystals of Cu–Mn alloys containing 14 to 23 at.% Mn. Torque measurements indicate that the easy direction of induced unidirectional anisotropy (exchange anisotropy) occurs in the direction of the field applied during cooling and that the constant of unidirectional anisotropy (e.g., 1.1×104 erg/cm3 for 17.8 at.% Mn) is independent of the crystallographic direction of the field during cooling. The experimental result is interpreted on the basis of the nucleation and growth process of mutually-interacting ferromagnetic and antiferromagnetic domains. It has also been found that a small uniaxial anisotropy is additionally induced. The field-cooled specimen is almost free from the rotational hysteresis, this being in marked contrast to the large rotational hysteresis in the specimen cooled in zero field.
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  • Ferromagnetic Properties of the Intermetallic Compound with the Hexagonal Leves-Phase Structure in Cobalt-Titanium System
    Takurô Nakamichi, Yoshihira Aoki, Mikio Yamamoto
    1970 Volume 28 Issue 3 Pages 590-595
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.590
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    The homogeneous composition range and magnetic properties of the hexagonal Laves-Phase compound, CO2+xTi1−x (x>0), have been determined by X-ray diffraction and magnetic studies. X-ray diffraction studies show that the MgNi2-type structure is stable in a narrow composition range from about 29 to 31.3 at.% Ti at room temperature. Magnetic measurements made at temperatures from 4.2° to 1,000°K indicate that these MgNi2 phase compounds are ferromagnetic with Curie points lower than 44°K, showing a conspicuous concave toward the temperature axis in every reciprocal magnetic susceptibility vs. temperature curve about the Curie point. It is shown that magnetic data can be interpreted under the assumption that excess cobalt atoms behave as impurity atoms with a localized moment located in the matrix of a paramagnetic compound, similarly to the case of the analysis of the magnetism of dilute magnetic alloys.
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  • Magnetism and Crystal Symmetry of α-Mn
    Takemi Yamada
    1970 Volume 28 Issue 3 Pages 596-609
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.596
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    A systematic method of magnetic structure analysis is developed and applied to the case of α-Mn. Scalar, vector, and tensor quantities in a phenomenological thermodynamical potential are expanded in complete sets of basis functions which form irreducible representations of the space group, and on this basis, a possible magnetic structure for α-Mn is discussed. A non-collinear magnetic structure containing thirteen parameters is proposed. The magnetic point group is isomorphic with either D2d of C3v depending on whether the principal axis is along either a ⟨100⟩ or a ⟨111⟩, respectively. Possible modes of magnetostrictive atom-displacement are also discussed.
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  • The Magnetic Symmetry of α-Mn and the Parasitic Ferromagnetism from Magnetic Torque Measurements
    Takemi Yamada, Shuichi Tazawa
    1970 Volume 28 Issue 3 Pages 609-614
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.609
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    Magnetic torque measurements on α-Mn were performed as a function of applied magnetic field in the range H<12 kOe for temperatures 4.2°K≤T<TN=95°K. The principal axis of the magnetic symmetry was determined to be along one of the ⟨100⟩ rather than the ⟨111⟩ in the temperature range 45°K≤T<TN. At temperatures below 42.5°K a weak ferromagnetic component appeared in the torque curves. This ferromagnetic component corresponds to the parasitic ferromagnetism observed by Arrott et al.. It was found that this magnetism was not intrinsic, but is due to a small amount of Mn3O4 impurity.
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  • Magnetic Structure of α-Mn
    Takemi Yamada, Nobuhiko Kunitomi, Yutaka Nakai, D. E. Cox, G. Shirane
    1970 Volume 28 Issue 3 Pages 615-627
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.615
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    A neutron diffraction study has been made on single crystal specimens of α-Mn at 4.4°K, 60°K, and several other temperatures. Five types of magnetic form factor were in turn employed in the analysis. The magnetic structure is described by a single non-collinear configuration throughout the temperature range below TN, with relatively large magnetic moments in Sites I, II and small moments in Sites III, IV, irrespective of which form factor is chosen. The experimental results seem to favor a localized moment model rather than a spin density wave model. When the analysis is based on the localized moment model, moments of 1.9, 1.7, 0.6 and 0.25 μB may be assigned to Site I, II, III, and IV, respectively at 4.4°K, and the spin density in the atom is a superposition of a positive 3d-density and a negative 4s-density. The dependence of the effective exchange interaction coefficient on the inter-atomic distance is discussed.
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  • Absorption Band Edge of Magnetic Semiconductors
    Takeshi Kambara, Yukito Tanabe
    1970 Volume 28 Issue 3 Pages 628-644
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.628
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    The shift of the absorption band edge with temperature and that due to an external magnetic field in magnetic semiconductors are investigated theoretically by studying a system in which a single conduction electron is interacting with localized spins on magnetic ions and a hole fixed on a magnetic ion.
    A general formula for the optical absorption band shape in the system is derived by using the Green’s function method. The result shows that the bend edge shift arises through the temperature and magnetic field dependence of the spatial correlation function between the localized spins. The electron-hole interaction also affects the band shape.
    The band shape functions near the absorption edge are numerically calculated for EuO and EuS at various temperatures and for several magnetic field strengths in classical spin approximation. The calculated results explain reasonably well the behaviour of the band edge shift with temperature and magnetic field.
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  • Incoherent Neutron Scattering and Nuclear Magnetic Resonance
    G. C. Summerfield, Robert Kleinberg
    1970 Volume 28 Issue 3 Pages 644-646
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.644
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    A relationship between incoherent neutron scattering and nuclear magnetic resonance is pointed out. This relationship is then used to compare neutron scattering and NMR in water.
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  • Electrical Resistance, Thermal Conductivity and Thermoelectric Power of Transition Metals at High Temperatures
    Tsuyoshi Aisaka, Masao Shimizu
    1970 Volume 28 Issue 3 Pages 646-654
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.646
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    In the Mott model for s-d scattering, the electrical resistivity, thermal conductivity, and thermoelectric power are calculated at high temperatures for palladium, platinum, rhodium, iridium, molybdenum, and tungsten, by assuming proper electronic structures, and making use of the density of states determined in the rigid band model from the data of low temperature specific heat coefficients. The results are compared with experiments. The calculated temperature dependences of electrical resistivity, thermal conductivity, and thermoelectric power at high temperatures are found to be strongly dependent on the shape of the density of states and the position of the Fermi level. All of these temperature dependences are consistent with the experimental results. It is confirmed that there is a strong correlation between these temperature dependences and those of electronic specific heat coefficient and spin susceptibility.
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  • On Plasmon Contribution to the Ultraviolet Absorbing Power of the Alkali Metals
    Mitsuo Watabe
    1970 Volume 28 Issue 3 Pages 655-660
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.655
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    It is pointed out that the recent calculations of the absorbing power due to a photon exciting both a plasmon and a photon in an electron gas are incorrect. The error is shown to result from the inconsistent (current non-conserving) treatment of the electron-electron (or electron-plasmon) interaction. The corresponding correct result should give essentially zero contribution owing to the requirement of the conservation law.
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  • On the Exact Origin of the lnT Dependence of the Resistivity of Dilute Cd–Mn Alloys
    H. Alloul, R. Deltour, R. Clad
    1970 Volume 28 Issue 3 Pages 661-666
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.661
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    The resistivity and susceptibility of dilute Cd.Mn alloys have been measured in the helium temperature range. Most of the previous existing data were taken on concentrated samples above the solid solubility limit and needed correction. The susceptibility follows a Curie-Weiss law with θ=0.1±0.05°K and peff=(4.7±0.3)μB, yielding a Kondo temperature of the order of 25m°K. Even on dilute samples, the impurity resistivity exhibits no deviation from a ln T dependence within the experimental accuracy. Such deviation from the Kondo ln T term is expected if one takes into account the most divergent higher order terms in perturbation theory. It is in fact shown that, even for high T⁄TK, a better understanding of the observed ln T dependence can be obtained for instance with Hamann’s expression of the resistivity.
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  • Energy Gap of the Crystalline Anthracene
    Yutaka Ishihara, Ichiroh Nakada
    1970 Volume 28 Issue 3 Pages 667-674
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.667
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    The DC-photoconduction of both pure and heavily tetracene doped anthracene single crystals has been investigated in both the strongly and weakly absorbing wavelength regions. With sandwich-type cell and under monochromatized illumination, the electron photocurrent (i−) and hole photocurrent(i+) were measured separately. With doped crystals, the current produced by the thermal excitation from the tetracene excited state could be measured for various temperature regions. The thermal activation energy for carrier generation from the tetracene excitation state was measured to be 0.35 eV for i+ and 0.24 eV for i−. As the excited state of tetracene included is 2.4 eV from the ground state, energy gap of crystalline anthracene was deduced to be 3.0 eV.
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  • Far-Infrared Cyclotron Resonance of n-Type InSb under Electric Field
    Yasuo Oka, Shin-ichiro Narita
    1970 Volume 28 Issue 3 Pages 674-683
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.674
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    The problem of impurity banding in n-type InSb has been investigated by means of far-infrared cyclotron resonance under electric field and the results have been compared with the resistivity data in magnetic field. From the cyclotron resonance measurement, it is found that for the sample of the effective donor concentration, ND−NA=1.8×1014cm−3, the impurity band clearly separates from the conduction band at 4.6 kOe, whereas for the sample of ND−NA=1.7×1015cm−3, the impurity band cannot be distinguished from the conduction band in low magnetic field, and the separation is observed at 19.3 kOe. These results of the optical measurements are consistent with those obtained from the resistivity measurements, and they are compared with both the theory based on isolated impurity states and that on impurity banding.
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  • Incubation Time of Acoustoelectric Domain in n-InSb
    Takeshi Aoki, Kiyonori Hayakawa, Tetsuya Arizumi
    1970 Volume 28 Issue 3 Pages 683-690
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.683
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    It has been known that there exist two different modes of acoustoelectric oscillation in n-InSb. In this report the observation on the incubation time of the acoustoelectric domain in crossed electric and magnetic fields reveals remarkable difference in its electric-field dependence between these two modes, suggesting the difference in phonon amplification mechanism. In the first mode, the incubation time decreases monotonically with increasing the electric field, while, in the second mode, it passes through a minimum at the electric field of about 20 V/cm.
    On the basis of these experimental results, the two modes of the acoustoelectric oscillation in n-InSb are discussed from the viewpoints of phonon amplification for two cases, ql<1 and ql>1. Furthermore, the incubation time is numerically calculated from Yamashita-Nakamura theory for the first mode, and Abe-Mikoshiba theory for the second mode, both results being in fairly good agreement with the experiments.
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  • Scintillation Pulse Shapes of Anthracene Single Crystals in Nanosecond Region. I. Initial Spikes in α-Scintillation Pulse
    Shigehiro Owaki, Yoshitake Kimura, Masaharu Kawanishi, Kiyoshi Sugihar ...
    1970 Volume 28 Issue 3 Pages 691-698
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.691
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    The accurate measurement of scintillation pulse shapes of anthracene single crystals has been performed by a newly constructed device with the time resolution of nanosecond by means of the sampling method under the pulse height selection and the accumulation of pulse shapes. The distinctive differences between the pulse shapes of luminescence excited by α-, β-particles, γ-ray and UV light pulse were observed. In case of excitation of α-particle, there appeared a characteristic peak which seemed to be superposed on a scintillation peak excited by β- or γ-ray. The dependence of this faster component, that is, the initial spike on the values of dE⁄dx of α-particle in anthracene crystal has been studied.
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  • Absorption Spectra of Alkali Fluorides in the Extreme Ultraviolet Region
    Hiroshi Saito, Setsuko Saito, Ryumyo Onaka
    1970 Volume 28 Issue 3 Pages 699-701
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.699
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    Absorption spectra of five kinds of alkali fluorides, namely LiF, NaF, KF, RbF and CsF are investigated at room temperature in the wavelength region from 500 A to 1000 A. In LiF and NaF only broad bands are observed except for the first exciton bands. In KF a doublet with a deep depression between the components is observed around 21 eV. In RbF and CsF quartets are observed around 17 eV and 14 eV, respectively. These multiplets are assigned to the exciton absorptions related with the transition from the uppermost cation core levels to the conduction bands.
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  • Photoemission from an Anthracene Single Crystal Doped with Alkali-Metals
    Susumu Yoshimura
    1970 Volume 28 Issue 3 Pages 701-705
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.701
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    External Photoelectric effect is investigated with an anthracene single crystal doped superficially with alkali-metals; cesium, potassium and sodium. The threshold energy is found to be dependent upon the amount of metal doped. When the doping amount is low, the photoelectrons are excited via the first singlet exciton state and are emitted with the aid of the surface double layer formed between alkali-metal and anthracene. The photoemission yield of a highly doped crystal shows a cubic law dependence upon the incident photon energy. The threshold energy, 2.57 eV, obtained in this case can be interpreted as the energy of surface state below the vacuum level.
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  • Determination of the State Parameters and Formulation of Spontaneous Strain for Ferroelastics
    Kêitsiro Aizu
    1970 Volume 28 Issue 3 Pages 706-716
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.706
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    For a crystal which can become ferroelastic, it is important to know those elements or those linear combinations of elements of mechanical strain tensor each of which, at null stress, is not equal in all the orientation states of the ferroelastic phase and is zero over the whole temperature range in the prototypic phase. These quantities are a kind of state parameters. Also, it is convenient to introduce “spontaneous strain” as a total measure for the ‘degree’ of ferroelasticity. Spontaneous strain should be independent of choice of the rectangular coordinate system, be the same in all the orientation states of the ferroelastic phase, and be zero over the whole temperature range in the prototypic phase. For each of the 94 species of ferroelastics, the set of state parameters is found, its way of changing with each state shift is determined, and the spontaneous strain (satisfying the above conditions) is formulated.
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  • Considerations of Partially Ferroelastic and Partially Antiferroelastic Crystals and Partially Ferroelectric and Partially Antiferroelectric Crystals
    Kêitsiro Aizu
    1970 Volume 28 Issue 3 Pages 717-722
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.717
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    It was reasoned that in normal ferroelastic crystals, if their prototypic (or peraelastic) phase transitions are of the second kind, the dependence of the spontaneous strain on temperature T should be proportional to (Tc−T)1⁄2 right below the transition temperature Tc and the T dependence of the elastic compliance should obey the so-called “Curie-Weiss law” above and below Tc. However, it is also considered that possible are ferroelastic crystals in which, whereas their prototypic phase transitions are of the second kind, the T dependence of the spontaneous strain should be proportional to Tc−T right below Tc and the T dependence of the elastic compliance should disobey the Curie-Weiss law above and below Tc. In this paper, two models of such ferroelastic crystals are presented and thermodynamically investigated. One of these models is not only ferroelastic but also feeroelectric; its spontaneous polarization and electric susceptibility should so peculiarly depend on T as its spontaneous strain and elastic compliance. These crystals are a kind of partially ferroelastic and partially antiferroelastic crystals and a kind of partially ferroelectric and partially antiferroelectric crystals; the ferroelasticity and ferroelectricity are “weaker” than the antiferroelasticity and antiferroelectricity respectively.
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  • Back Reflected Intensity for the Laue Case
    R. M. Stern, H. Taub, H. Wagenfeld
    1970 Volume 28 Issue 3 Pages 723-731
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.723
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    The exact formulation of the dispersion equation in the dynamical electron diffraction theory of Bethe leads to the existence of four wave fields in the crystal in the two-beam Laue case. At low energies it is necessary to consider all four wave fields within the crystal and the resulting interferences between them. Computer calculations for the vacuum electron currents in the exact two-beam case of low energy electron diffraction for a thin parallel slab are shown. The current variation due to interferences between all the crystal wave fields for the elastic case and for the case where absorption is introduced by means of a complex Fourier coefficient of the potential are demonstrated. The importance of the structure due to the additional solutions for primary electron energies below 50 eV shows that any elastic theory of electron diffraction must contain the total wave field to be valid at these low energies.
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  • Thermoluminescence of γ-Irradiated Polytetrafluoroethylene
    Akihiro Tomita
    1970 Volume 28 Issue 3 Pages 731-738
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.731
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    The measurements of the thermoluminescence glow curves of polytetrafluoroethylene (PTFE) irradiated in air and in vacuum are made in the temperature range −196 to 150°C. Seven glow peaks appear at the following temperatures; 126, 104, 38, 22, −8, −67 and −96°C. The glow peaks which appeared at −67°C in the case of irradiation in vacuum and at −96°C in the case of irradiation in air are the principal ones. The spectra and the decays of these glow peaks are measured. The effects of the crystallinity of the sample on the glow are examined. The results are interpreted on the basis of electron-trapping theory, and some deductions are given of the luminescence centers and the electron traps.
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  • Nonlinear Behaviors of Waves in a Plasma in the Vicinity of Marginally Stable State
    Yukio Midzuno, Tsuguhiro Watanabe
    1970 Volume 28 Issue 3 Pages 738-747
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.738
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    Nonlinear behaviors of monochromatic traveling waves are discussed by the use of an asymptotic method. The wave is assumed to be stationary in the first approximation and nonlinear interactions are taken into account only among the wave under consideration and its harmonics. It is shown that two cases are distinguished according as the frequency of the wave in the first approximation is given by a simple root or a double root of the dispersion relation. Characteristic behaviors of the wave in the latter case are investigated by discussing a model equation and special cases of two-beam instability. The behaviors of the complex amplitude of the wave are visualized in the form of “a motion of a particle in an axisymmetric potential field”. Various phenomena, such as amplitude oscillation, explosion of amplitude, amplitude-dependent frequency shift, are found to take place depending on the plasma and the initial condition.
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  • Sum and Difference Frequency Generation in a Plasma by Two Nonuniform Electric Fields in the Presence of a Static Magnetic Field. II
    Masatada Ogasawara, Sigehiko Mori
    1970 Volume 28 Issue 3 Pages 748-758
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.748
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    Boltzmann equation analysis is made of nonlinear generation of sum and difference frequency components in a current density, due to two rf electric field applied to a magneto-plasma. Mechanism of the nonlinearity lies in nonuniform nature of the rf electric fields. All the related frequencies are assumed to be sufficiently high that dynamics of ions can be ignored. A general expression of the current density is derived both in slightly and fully ionized plasmas. Under suitable conditions, the general expression reduces to what was derived earlier by several authors. Numerical results show; (a) the nonlinear current depends much on a velocity dependence of collision frequency and (b) difference between collision frequencies νl’s (l=1, 2) cannot be ignored. Electron-electron collision does not contribute to the nonlinear current in a magneto-plasma as in unmagnetized plasma treated by Shkarofsky. Vanishing of the contribution from the e-e collision is due to a fortuitous cancellation of the contributions from linear and nonlinear collision terms.
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  • The Hall Effect on the Magnetogasdynamic Flow past an Axi-Symmetric Body. II. Boundary Layer Flow
    Humio Naruse, Shoichi Nishijima
    1970 Volume 28 Issue 3 Pages 758-766
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.758
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    In order to see the torque acting on an axi-symmetric body as the result of the Hall effect on the magnetogasdynamic flow, the boundary layer of the steady, incompressible, magnetogasdynamic flow past an axi-symmetric body which is an insulator is studied on the assumption that a magnetic field is parallel to the velocity at infinity upstream and the magnetic Reynolds number Rm is small.
    The equations governing the flow in the above boundary layer are reduced. Further, the equation for the velocity component in the azimuthal direction is derived by expanding these in power series with respect to α2Rm, where α2 is the pressure number.
    For the cases of a sphere and a circular disc this equation is solved, being expended in power series of X where X is the distance from the forward stagnation point measured along the surface, and the torque exerted on the body is determined.
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  • Dynamics of Multi-Component Plasma with Transport Phenomena
    Sinzi Kuwabara
    1970 Volume 28 Issue 3 Pages 767-775
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.767
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    Fundamental equations for a multi-component plasma with transport phenomena for the case of no magnetic field are proposed. Each component of the plasma is electrically charged or neutral, and has its own velocity and temperature, as well as its density and partial pressure. As the transport phenomena, the “velocity relaxations” and the “temperature relaxations” between components are taken into account, as well as the viscosities and the thermal conductivities. These fundamental equations can be confirmed on the basis of the Boltzmann equations, using the “mean free time approximation.” For the typical examples, the Rayleigh- and the oscillating plate-problems for two-component plasma, etc. are examined.
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  • Laminar Viscous Flow past a Semi-Infinite Flat Plate
    Akira Yoshizawa
    1970 Volume 28 Issue 3 Pages 776-779
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.776
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    The laminar viscous flow past a semi-infinite flat plate set parallel to a uniform stream is studied by solving the Navier-Stokes equations numerically. The bounday-layer- and Stokes-type successive approximations give the following expansions of the local skin-friction coefficient Cf:
    (Remark: Graphics omitted.)
    where the constants a, b and C are to be determined, and Rx is the Reynolds number based on the distance measured along the flat plate from the leading edge. From the present numerical results, the constants a, b and C are estimated as follows: a=0.374, b=0.022, C=0.3.
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  • Stability of Blasius Flow
    Kanefusa Gotoh
    1970 Volume 28 Issue 3 Pages 780-783
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.780
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    The stability of a boundary layer flow along a flat plate is investigated. A simple model of Blasius velocity profile is proposed and its propriety in the stability theory is confirmed.
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  • Heat Transfer from a Circular Cylinder in a Rarefied Gas Flow
    Kyoji Yamamoto
    1970 Volume 28 Issue 3 Pages 783-789
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.783
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    The heat transfer from a circular cylinder in a slightly rarefied gas flow at low Mach numbers is investigated on the basis of the linearized B–G–K model of the Boltzmann equation. A kinetic theory analysis of the Knudsen layer around the cylinder is put forward to the second approximation. Numerical discussions are made of the structure of the Knudsen layer and of the coefficient of temperature jump. A formula for the Nusselt number is also derived.
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  • Damped Oscillation of the Longitudinal Spin-Spin Relaxation
    Toshihiro Shimizu
    1970 Volume 28 Issue 3 Pages 790
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.790
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  • Ferromagnetism and Antiferromagnetism in Co–Mn Alloy
    Masaaki Matsui, Tadashi Ido, Kiyoo Sato, Kengo Adachi
    1970 Volume 28 Issue 3 Pages 791
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.791
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  • Cubic-Tetragonal Transition and Antiferromagnetism of γ-Phase Mn–Ni Alloys
    Hidema Uchishiba, Tomiei Hori, Yasuaki Nakagawa
    1970 Volume 28 Issue 3 Pages 792
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.792
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  • Mössbauer Study of Ordered and Disordered Alloy Au80Cr20
    Masahumi Kohgi, Takemi Yamada, Nobuhiko Kunitomi, Yutaka Maeda
    1970 Volume 28 Issue 3 Pages 793-794
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.793
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  • Co59 NMR in Stacking Faults of Cubic Cobalt Thin Film
    Noriyoshi Inoue
    1970 Volume 28 Issue 3 Pages 794
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.794
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  • Magnetic Form Factor of Disordered Antiferromagnetic Alloy AuCr
    Nobuhiko Kunitomi, Yutaka Nakai, Yasusada Yamada, Kazuko Inoue
    1970 Volume 28 Issue 3 Pages 795
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.795
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  • Magnetic Field Dependence of Delayed Fluorescence in Anthracene Crystals
    Masayoshi Naito
    1970 Volume 28 Issue 3 Pages 796
    Published: March 05, 1970
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.796
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  • Theory of Electronic Specific Heats of Dilute Alloys
    Akira Sugiyama
    1970 Volume 28 Issue 3 Pages 797
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.797
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  • Electrical Properties of the V4O7 Single Crystals
    Hideyuki Okinaka, Koichi Nagasawa, Koji Kosuge, Yoshichika Bando, Suke ...
    1970 Volume 28 Issue 3 Pages 798-799
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.798
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  • Measurement of the Microwave Conductivity of Semiconductors by a Cavity Perturbation Method
    Hiroshi Kobayashi, Toshihiko Kobayashi, Kazuo Fujisawa
    1970 Volume 28 Issue 3 Pages 799
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.799
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  • Temperature and Dispersion Characteristics of the Optical Rotatory Power of TeO2 Single Crystal
    Naoya Uchida, Shintaro Miyazawa, Shoichi Saito
    1970 Volume 28 Issue 3 Pages 800
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.800
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  • Electron Paramagnetic Resonance of Cr3+ in NH4H2PO4
    Kazumi Niimori, Takamasa Kawano, Kenzi Hukuda, Nobufusa Fujita
    1970 Volume 28 Issue 3 Pages 801-802
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.801
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  • Effect of Temperature on Anharmonicity of the Normal Modes of Oscillation of Rock-Salt Crystal
    S. P. Srivastava, M. N. Sharma
    1970 Volume 28 Issue 3 Pages 802
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.802
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  • Electrical Properties of the V5O9 Single Crystals
    Hideyuki Okinaka, Koichi Nagasawa, Koji Kosuge, Yoshichika Bando, Suke ...
    1970 Volume 28 Issue 3 Pages 803
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.803
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  • {10\bar12} Transformation Twins in Hexagonal Martensite
    Kazuhiro Otsuka, Kenichi Shimizu
    1970 Volume 28 Issue 3 Pages 804
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.804
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  • Absorption Spectra of Au− Ions in Alkali Halides
    Teruhiko Mabuchi, Akira Yoshikawa, Ryumyo Onaka
    1970 Volume 28 Issue 3 Pages 805
    Published: March 05, 1970
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.28.805
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