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Volume 18, Issue 7
Displaying 1-42 of 42 articles from this issue
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Naomoto Shikazono1963 Volume 18 Issue 7 Pages 925-935
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith the source of Sb125 embedded in copper or iron metal, the recoilfree resonant absorption of 35.3-kev gamma rays by Te125 atoms in the crystals of tellurium, α-TeO2, MnTe, and CrTe cooled with liquid nitrogen has been studied. For the crystals of tellurium and α-TeO2, large quadrupole splittings are observed. The values of |e2qQ|=1.6×10−6 eV, or |e2qQ⁄h|=400 Mc are obtained for both the crystals of tellurium and α-TeO2, and the quadrupole moment of the first excited state of Te125 is estimated to be about 0.2 barn under some assumptions.
For the crystal of MnTe and the source embedded in copper, a simple Lorentz line is observed and from the half width the half life of the 35.3-keV level of Te125 is calculated to be (1.8±0.3)×10−9 sec.
For the crystal of CrTe, line broadening due to the internal magnetic field is observed. The internal field in the CrTe crystal is evaluated to be about 50 Koe.
With the source embedded in iron metal, Zeeman splittings are observed, although they are poorly resolved. The magnetic moment of the first excited state of Te125 and the internal magnetic field at the Te nuclei in the iron environment are estimated to be about 0.7 n.m. and 600 koe respectively.View full abstractDownload PDF (1612K) -
Masaomi (Takahata) Ohta1963 Volume 18 Issue 7 Pages 936-944
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe interactions considered as collisions between nucleons with the primary energies of the order of 100 GeV are analyzed.
i) The average values of PT,⟨PT⟩, are obtained for individual showers. A shower whose value of ⟨PT⟩ is exceptionally small, i.e. 0.11 GeV/c, is found.
ii) The energy distribution of secondary particles has the form of inverse square distribution, except for the lowest energy interval (E*⁄mπc2<1.5). The average value of energy has a tendency to increase slowly with increasing primary energy, though it is nearly constant up to 200 GeV.
iii) The individual angular distribution of secondary particles in the center-of-mass system seems to differ from event to event, but the overall distribution can be expressed in the form F(cosθ*)=1+kcos2θ*, k=5.2±2.0.View full abstractDownload PDF (1160K) -
Yasuko Maeda1963 Volume 18 Issue 7 Pages 945-954
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe interactions of heavy primary particles in cosmic rays are analyzed by the method of nuclear emulsions. From this analysis, some characteristics of nuclear structure are obtained. The ratio of the number of fragment alpha particles to that of fragment protons produced by incident heavy primaries (Z between 6 and 9) is about 0.37 for Nh≤7 events, and this value is in good agreement with the results of other experiments. The transparency of medium nucleus is estimated to be about 30%. The relation between incident energies and average number of produced mesons is compared with other accerelator data. The experimental results are well interpreted from the view that the medium nucleus having charge 6 to 9 is constructed from a group of some complete helium nuclei if the charge of medium nucleus is evem (alpha particle model), while the odd charged medium nucleus is composed of some helium nuclei and a helium nucleus accompanied by an extra proton.View full abstractDownload PDF (1012K) -
Yosiaki Tino, Takao Maeda1963 Volume 18 Issue 7 Pages 955-961
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anomalous thermoelastic variation, especially the “Elinvar” effect, of the Invar-type iron-nickel alloys was investigated in connection with the magnetic transformation. In order to determine the ferromagnetic Curie point, the change of magnetization by an increase of magnetic field above technical saturation was directly measured as a function of temperature. The comparison of the magnetic data with the Young’s moduli measured by an electrostatic method against temperature led to the conclusion that a magnetic inhomogeneity plays a chief role in this phenomenon. Based upon this viewpoint, the effect of partial martensitic transformation or precipitation of metastable phases on the thermoelastic variation was studied.View full abstractDownload PDF (776K) -
Ko Sugihara1963 Volume 18 Issue 7 Pages 961-969
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theory is proposed to explain the dependence of spin-lattice relaxation rate, 1⁄Ts, of donors on the concentration and the degree of compensation. In the theory donor electrons are classified into two groups according to their spin-lattice relaxation rate being rapid or slow. The first is those electrons belonging to the close pairs of phosphorus atoms which are few in number. One site of a close pair is occupied and the other occupied. These electrons relax rapidly through the hopping motion accompanied by reversal of spin orientation. The second group is those electrons associated with the isolated phosphorus atoms. They approach to the first group via the hopping motion without changing their spin orientations and finally relax at the sites of the fast-relaxing centers associated with the first group. Qualitative agreement between calculation and the experimental data of Igo is obtained with the exception of the heavily compensated samples.View full abstractDownload PDF (1160K) -
Takeji Ayukawa1963 Volume 18 Issue 7 Pages 970-976
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spontaneous magnetization of ferromagnetic thin films is calculated by the spin wave theory under the same boundary condition for the transverse magnetization as derived by Pincus, and its dependence on temperature, thickness and surface anisotropy is discussed. A numerical evaluation in the limiting case of infinite surface anisotropy shows that the M(T) (magnetization vs temperature) varies with temperature more slowely in thin films than in bulk materials and the magnitude of M(T)⁄M(0) is larger in thinner films at a fixed temperature. It is shown qualitatively that the magnetization of thin films decreases with reduced surface anisotropy to a lower value than in the bulk, so that for an appropriate value of the surface anisotropy the temperature dependence of magnetization in thin films is expected to be similar to that in the bulk, as observed.View full abstractDownload PDF (1032K) -
A. Mookherji, S. C. Mathur1963 Volume 18 Issue 7 Pages 977-980
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPrincipal magnetic susceptibilities of cupric acetate monohydrate single crystal between room temperature and 90°K have been measured, from which the magnitudes of the exchange integrals for two directions of ionic cluster have been directly deduced. It is seen that the exchange integral is isotropic and remains constant to a first approximation in the range of temperature of study. The variation in g-values is calculated with the help of the constant J-value, in good agreement with PMR findings.View full abstractDownload PDF (500K) -
Takashi Okada, Hisashi Sekizawa, Shûichi Iida1963 Volume 18 Issue 7 Pages 981-985
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe substitution of a small amount of Co2+ and Ge4+ for Fe3+ in yttrium iron garnet causes remarkable changes of the magnetic anisotropy constants and ΔH. The magnetic anisotropy constants K1 and K2 of Y3Fe5−xCox⁄2Gex⁄2O12 depend strongly on temperature, and K1 is linear to the concentration of cobalt at a given temperature, where x=0, 0.0042, 0.017, 0.048. The effect of cobalt substitution is similar to the case of magnetite containing cobalt, and can be accounted for by Slonczewski’s theory with the value of the parameter |αλ|=100 cm−1. The line width ΔH increases with the increase in cobalt concentration.View full abstractDownload PDF (544K) -
Terutaro Nakamura, Kikuo Ohi1963 Volume 18 Issue 7 Pages 985-995
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new type of twin structure is found in sodium nitrite crystals. The twin structure was studied by optical, etching, electronmicroscopic, interferometric and x-ray methods. It is established by x-ray study that this twin structure is reflection or rotation twin with {121} as twin plane. Etching experiment indicates that the head-to-tail configuration of spontaneous polarization vector is realized, and suggests that the rotation twin is the case.
This twin structure is produced by mechanical stresses, and some terrace formation is observed on the cleaved face by an interference microscope after producing the twin lamellae.
Electronmicroscopic observation shows that the twin lamellae are ca. 1μ∼5μ thick.
High electric field applied for a long period caused no twin boundary movement, though antiparallel domain walls move under the same condition. The twin structure disappears gradually on increasing temperature, and the disappearance does not take place sharply at the ferroelectric Curie point.
It is also concluded that the twin has no special interaction with ferroelectricity, except that a strong head-to-tail dipole coupling of ferroelectric crystal affects the antiparallel domain structure.View full abstractDownload PDF (2408K) -
Hiroshi Watanabe, Hisao Yamamoto, Ken-ichi Ito1963 Volume 18 Issue 7 Pages 995-999
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA powder neutron diffraction study has been made on the intermetallic compound, FeSi. From magnetic measurements this substance has been believed to be antiferromagnetic below 170°C. Neutron diffraction measurements at room temperature and at liquid nitrogen temperature, however, show no coherent antiferromagnetic intensity, thus ruling out any long range magnetic order. Some results of magnetic measurements and discussion are presented.View full abstractDownload PDF (484K) -
Jiro Yamashita, Mituru Fukuchi, Shinya Wakoh1963 Volume 18 Issue 7 Pages 999-1009
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEnergy band structure of Nickel is investigated by the modified tight-binding approximation and the Green’s function method. Proper l-dependent potentials are used for computation. The general character of the 3d-bands is quite similar to that in Cu. The total width of the 3d-bands is estimated as 0.304 ry by TBA, and 0.314 ry by GFM.View full abstractDownload PDF (1480K) -
Jiro Yamashita1963 Volume 18 Issue 7 Pages 1010-1016
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectronic structures of TiO and NiO are investigated by the modified tightbinding approximation developed by Stern. The general character of the 3d–bands of TiO is found to be quite similar to that of Ni, or Cu. The total width of the 3d–bands is estimated as 6 ev. Thus, the width of the 3d–bands of TiO is nearly the same as that of Ni, or Cu. Since the band-width is fairly wide, the band approximation is expected to be applicable to TiO. The electrical conduction in TiO may be ascribed to the conduction in the d–bands. On the other hand, the total width of the 3d–bands of NiO is quite narrow. It is estimated as only 0.4 ev. However, the general character of the band is quite similar to that of TiO and the theory predicts that the NiO crystal is a conductor. Thus, we see that in the case of NiO there is a definite discrepancy between the simple band theory and the experiment.View full abstractDownload PDF (880K) -
Takashi Tsuchida1963 Volume 18 Issue 7 Pages 1016-1019
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Hall coefficient and magnetic susceptibility of the hydrides of palladium silver alloys are measured as a function of hydrogen content in order to clarify the role of hydrogen in palladium. From the relation between the magnetic property and the hydrogen content, it is concluded that a valence electron of hydrogen plays a similar role in the hydride to that of a valence electron of silver atom in palladium-silver alloys. In diamagnetic region, that is, in higher content region of β-phase, the Hall coefficient considerably decreases with increasing hydrogen content, indicating that a valence electron of a hydrogen atom takes a part in conduction.View full abstractDownload PDF (460K) -
Yukio Obata1963 Volume 18 Issue 7 Pages 1020-1024
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNuclear magnetic relaxation rates due to dipolar and orbital interactions are calculated for cubic metals with partly filled p– or d–bands, using the tight-binding approximation. For p–band metals the ratio of two relaxation rates is 3:10. For d–band metals this ratio is a function of the degree of admixture of Γ5 and Γ3 atomic functions at the Fermi surface. It is shown that the orbital relaxation mechanism is almost always more effective than the dipolar one.View full abstractDownload PDF (592K) -
Takeo Izuyama, Duk-Joo Kim, Ryogo Kubo1963 Volume 18 Issue 7 Pages 1025-1042
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAlthough the neutron diffraction phenomena in ferromagnetic transition metals have been successfully treated in terms of the localized spin model, this may not be regarded as a proof of the unique validity of such a model. If the correlation effect of electrons is taken into consideration by a ladder approximation, the itinerant electron model is shown to be capable of accounting for the observed diffraction equally well. The complex dynamical susceptibility is calculated with simple assumptions and the space-time correlation function of spin density is obtained from it by means of the fluctuation-dissipation theorem. The cross-section for neutron scattering derived from the correlation function explains the magnetic diffuse scattering below Tc, the magnetic critical scattering around Tc and the paramagnetic scattering above Tc. Existing data are not enough in order to discriminate between the localized and itinerant models.View full abstractDownload PDF (2076K) -
Taro Kihara, Osamu Aono, Yukikazu Itikawa1963 Volume 18 Issue 7 Pages 1043-1050
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe basic theorem proposed in Part I of the paper is applied to two-component plasmas. The relaxation between ion and electron temperatures, attenuation of low-frequency oscillations, diffusion and thermal conduction across a magnetic field, and relaxation of an anisotropic distribution of ion velocities are treated. The rates of these relaxations with exact numerical factors in the arguments of the Coulomb logarithms are obtained.View full abstractDownload PDF (848K) -
Yoshiaki Tanikawa, Hideo Suzuki, Shigeo Yomosa1963 Volume 18 Issue 7 Pages 1051-1056
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple, general method is presented for solving the secular equations which may be expected in the LCAO HMO calculation on chain molecules of finite length and of repeated arrangement of a finite group of atoms. The validity of the method is confirmed by showing that the solutions in the case of polyens agree completely with those of Lennard-Jones. Additional real solutions which correspond to the so-called surface states are also derived from the first principle. Applications of the present method to the more general cases where secular determinants have a few irregular elements as well as regular ones are briefly explained.View full abstractDownload PDF (748K) -
Takashige Tsukishima, Susumu Takeda1963 Volume 18 Issue 7 Pages 1056-1061
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe microwave powers reflected by magneto-plasmas are examined experimentally and compared with theoretical values at resonances calculated under an approximation, in a range where ωp2⁄ω2 is close to unity and for small ωc⁄ω, where ωp is the plasma frequency, ω is the applied microwave frequency and ωc is the electron cyclotron frequency. It is demonstrated that the reflection method adopted here is useful for detecting the electron resonances which appear approximately at 1−ωp2⁄ω2=ωc2⁄ω2, in particular for small ωc⁄ω. Moreover the collision frequency ν can be estimated from the relative value of the reflected power at resonance. The incident microwave power is most efficiently absorbed at a relatively small value of ωc⁄ω, for instance, at ωc⁄ω\simeq0.3 for ν⁄ω\simeq0.1×(ωp2⁄ω2).View full abstractDownload PDF (720K) -
Ryo Sugihara1963 Volume 18 Issue 7 Pages 1062-1065
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theoretical investigation is made of the radiation from a charge q moving along a magnetic field with a fast but nonrelativistic velocity v, the spatial dispersion of the dielectric tensor being taken into account. In addition to the peak of the well-known Cerenkov radiation, discrete peaks appear in the spectrum of radiation near frequencies ω=sωH(s≥2), which are the higher harmonics of the gyromagnetic frequency of the plasma electrons. The intensity of each peak is almost constant over several peaks which correspond to the harmonics number of the order of unity, and is given by
\fracq2ω02v×O(1),
ω0 being the plasma frequency.View full abstractDownload PDF (464K) -
Masatada Ogasawara1963 Volume 18 Issue 7 Pages 1066-1073
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe coefficient of collisional damping of the electron plasma oscillation is calculated by means of Boltzmann’s collision term in the limit of long wave length. The damping coefficient is given by
ωi=\frac12Λ00(1)+\frac23(Λ00(2)+λ00(2))\left(\frackkD\ ight)2,
where kD is the inverse of the Debye length and k is the wave number. The constants Λ00(1), Λ00(2) and λ00(2) are collision integrals. The first corresponds to the change of the momentum of the electrons due to collisions with the ions. The second and the third are equal to the rates of relaxation of the elliptic velocity distribution of the electrons due to electron-ion and electron-electron interactions, respectively.View full abstractDownload PDF (792K) -
A. S. Gupta1963 Volume 18 Issue 7 Pages 1073-1082
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThis paper discusses the initial manner of development of an infinitesimal disturbance of a plane horizontal layer of a viscous, perfectly conducting, incompressible fluid of variable density in the presence of a horizontal magnetic field. It is found that when the coeffient of viscosity μ0 (which is a function of the vertical co-ordinate z) be such that d2μ0⁄dz2<0, instability might arise in the form of oscillation with increasing amplitude i. e., overstability. This shows that contrary to the usual role of viscosity as a damping factor, it may sometimes act as a destabilising agent. Furthermore, it is seen that a sufficiently strong magnetic field may stabilise a potentially unstable configuration.View full abstractDownload PDF (988K) -
N. R. Rajappa1963 Volume 18 Issue 7 Pages 1083-1086
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAffine relations connecting the transverse vibrations of isotropic and orthotropic plates are determined for rectangular plates which may be treated by the method of Levy. Using these relations, the exact frequencies of free vibration of orthotropic plates can be readily calculated without much labour from those of the corresponding isotropic plates. Numerical illustrations of these relations are given for some cases.View full abstractDownload PDF (412K) -
J. B. Shukla1963 Volume 18 Issue 7 Pages 1086-1088
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA modified Reynolds equation governing the flow of an electrically conducting, incompressible, viscous lubricant in the presence of a magnetic field is derived and particular cases of this for infinitely long and very narrow bearings are deduced.View full abstractDownload PDF (232K) -
Midori Tanaka, Tadashi Mizoguchi, Yoshimichi Aiyama1963 Volume 18 Issue 7 Pages 1089
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Yoshika Masuda1963 Volume 18 Issue 7 Pages 1090
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Midori Tanaka, Tadashi Mizoguchi, Yoshimichi Aiyama1963 Volume 18 Issue 7 Pages 1091
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Yoshinori Chiba, Kikuko Ueki, Masayoshi Sakamoto1963 Volume 18 Issue 7 Pages 1092-1093
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Saburo Miyake1963 Volume 18 Issue 7 Pages 1093
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
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Saburo Miyake, Tatsunosuke Kaneko, Nobuo Ito1963 Volume 18 Issue 7 Pages 1094
Published: July 05, 1963
Released on J-STAGE: June 01, 2007
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Shigeru Ando1963 Volume 18 Issue 7 Pages 1095
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Ichiro Tsuboya, Makoto Sugihara1963 Volume 18 Issue 7 Pages 1096
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Kinichiro Azuma, Kiyoshi Ohta, Takanori Tomita1963 Volume 18 Issue 7 Pages 1097-1098
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Tsuyoshi Ohnishi1963 Volume 18 Issue 7 Pages 1098-1099
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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A. L. Laskar, K. C. Pande1963 Volume 18 Issue 7 Pages 1099
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Takao Iwata1963 Volume 18 Issue 7 Pages 1100
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Tadashi Sugawara, Ikuyo Yamase1963 Volume 18 Issue 7 Pages 1101-1102
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Tadashi Sugawara, Ryukichi Soga1963 Volume 18 Issue 7 Pages 1102-1103
Published: July 05, 1963
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Masayuki Ieda, Masamitsu Kosaki, Ukichi Shinohara1963 Volume 18 Issue 7 Pages 1103-1104
Published: July 05, 1963
Released on J-STAGE: May 29, 2007
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Yoshiro Moriguchi, Hiroshi Hayashi, Yasubumi Yokoyama1963 Volume 18 Issue 7 Pages 1104-1105
Published: July 05, 1963
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Takemi Komatsubara, Miyuki Murakami, Eiji Hirahara1963 Volume 18 Issue 7 Pages 1106B
Published: July 05, 1963
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Yuh Fukai1963 Volume 18 Issue 7 Pages 1106A
Published: July 05, 1963
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Masayuki Itakura, Hiroo Toyoda1963 Volume 18 Issue 7 Pages 1106C
Published: July 05, 1963
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