Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 32, Issue 2
Displaying 1-50 of 59 articles from this issue
  • Hisashi Yoshii
    1972 Volume 32 Issue 2 Pages 295-305
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The high energy nuclear active particles (NAP) of more then 200 GeV, associated with EAS, have been studied by means of the large area scintillation detectors under water tank, at the mountain altitude of 2770 m a.s.l. We have obtained the following results; (1) The energy spectrum of NAP has a knee at about 500 GeV where the spectrum index changes from −1.0 to −1.8, (2) The lateral distribution of NAP can be expressed as Aexp(−rr0) with r0 of 1∼2 m, (3) The number of NAP is much smaller than the results of the Monte Calro simulations assuming the ordinary interaction model, and (4) The mean transverse momentum of NAP is about 2 GeV/c which is much higher than generally accepted value in the nuclear interactions.
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  • Norihiko Koori
    1972 Volume 32 Issue 2 Pages 306-315
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The energy spectra of breakup protons with energy larger than 1.2 MeV from the D(n, p)2n reaction by 14.1 MeV neutrons have been measured, in terms of the absolute cross section (d2σ⁄dΩdEp), at 9 proton emission angles between 4° and 60° with a counter telescope. The measured breakup proton spectra agree fairly well with those measured by the Zagreb group at 4.8° and 10°, but are about 30% larger than their spectra at angles larger than 20°. The present spectra are in excellent agreement with the recent calculation of Cahill and Sloan at angles up to 60°, except for the discrepancv of 25% in the n-p final-state-interaction region of the spectrum for angles less than 20°. The differential cross section (dσ⁄dΩ) for the breakup reaction has been also obtained and discussed.
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  • Yoshio Yamaguchi
    1972 Volume 32 Issue 2 Pages 316-319
    Published: February 05, 1972
    Released on J-STAGE: May 29, 2007
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    A possibility of parity-violating strong interactions is discussed. A particular emphasis is made in order to understand the unique situation: the parity conservation could be satisfied with very good accuracies for low energy phenomena in nuclear and particle physics even when strong interactions are P-violating.
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  • Juh-Tzeng Lue, Chao-Yuan Huang
    1972 Volume 32 Issue 2 Pages 320-323
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The orbit-lattice interaction has been used to explain the temperature-dependent crystal-field parameter b4 of Eu++ in CaF2 and SrF2. By admixing the excited 4f6ns configuration, this theory is successful in explaining the temperature dependence of b4, but the theoretical estimate in the magnitude dependence is about a, factor 103 smaller than the observed value. The covalency is believed to be the main source of this discrepancy. It is also shown that in the point-charge approximation, the effect due to thermal expansion is too small to account for the measured temperature-dependent part of b4.
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  • Eijiro Haga, Syozo Maeda
    1972 Volume 32 Issue 2 Pages 324-331
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The spin lattice relaxation time due to the interaction between nuclear quadrupole moments and conduction electrons is calculated by taking into account the interaction between conduction electrons. It is shown that, for Au197, it contributes to the measured value. The sudden change of the exchange enhancement factor as one goes from Ag0.05Au0.95 to pure Au, which is found without taking into account the quadrupolar interaction for pure Au, is explained by this mechanism.
    Interactions between nuclei due to the direct and indirect quadrupolar interactions are also calculated and compared with the dipolar interaction.
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  • Hiroaki Ono
    1972 Volume 32 Issue 2 Pages 332-336
    Published: February 05, 1972
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    One-dimensional anharmonic lattice with spacially varying distribution of mass m and spring constant k is investigated by using a continuum model.
    Dynamical equation governing such a lattice can be reduced to the following simple nonlinear equation:
    ψτpψξξξξ+ν(τ)ψ=0,
    (Remark: Graphics omitted.),
    where ψ denotes the modified velocity of the constituting particle, ξ and τ are stretched time and space coordinates, c is the local propagation speed of the linear lattice wave, \hatα and \hatλ stand for the nonlinearity coefficient and the dissipation coefficient, respectively, and p is a positive constant.
    It is found that governing equations for various dispersive waves in other inhomogeneous media can also be transformed into this convenient form. By using this equation, it can be shown that an initially given soliton may be disintegrated into a number of solitons and/or oscillatory waves depending upon the property of ν(τ).
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  • Kazukiyo Nagata, Yuichi Tazuke
    1972 Volume 32 Issue 2 Pages 337-345
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The temperature dependence of paramagnetic resonance frequencies in a short range ordered spin state is studied theoretically and experimentally for two typical one-dimensional Heisenberg antiferromagnets, CsMnCl32H2O and (CH3)4NMnCl3. The present theory with the classical nearest-neighbor Heisenberg model properly predicts the shift of the resonant field from the high temperature limit for both crystals. The observed shift for CsMnCl32H2O can be explained only by the dipolar term. For (CH3)4NMnCl3, however, the effect of the single-ion anisotropy, or the D-term, has to be taken into account in the explanation of the temperature variation.
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  • Seizo Watarai, Tatuo Kawasaki
    1972 Volume 32 Issue 2 Pages 346-356
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    Within the random phase approximation, the Green functions are obtained in Heisenberg antiferromagnets doped with impurities. In order to understand the temperature dependence of spin-wave impurity modes intuitively, the local energy renormalization factors are introduced which play a role of an effective field for individual spin. Dimension of the eigenvalue matrix of impurity modes is reduced to (z+1)×(z+1) from 2N×2N by introducing an appropriate approximation. Here, z and N represent the coordination number and the number of ions in one sublattice, respectively. Numerical calculations of the Green functions and spin correlations are carried out self-consistently. Magnetizations of impurity and its nearest neighbor ions, energy eigenvalues of the localized modes and energy spectra of the resonant modes are calculated as functions of temperature for various values of the impurity-host exchange coupling J′ and the impurity spin S′ in a simple cubic antiferromagnet with S=5⁄2.
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  • Toshinobu Soma, Akira Morita
    1972 Volume 32 Issue 2 Pages 357-364
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The formation and migration energies of a vacancy in Si and Ge are calculated by using the perturbation theory developed in the authors’ previous paper, in which the perturbation theory in terms of pseudopotentials has been extended by including higher order terms corresponding to the covalent bonding effect so as to be applicable to IV and III-V covalent semiconductors. In calculations, lattice distortions around a vacancy are taken into account. The formation energy of a vacancy is calculated to be 2.74∼2.84 eV for Si and 2.53∼2.63 eV for Ge. The migration energy of a vacancy is 0.38∼0.50 eV for Si and 0.31∼0.40 eV for Ge. Experimental data are discussed in comparison with these theoretical values.
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  • Ki-ichi Nakamura
    1972 Volume 32 Issue 2 Pages 365-376
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    By using a Boltzmann equation treatment, a nonlinear theory is constructed for the amplification of phonons from the thermal background through the acoustoelectric interaction. For ql>>1 and ωτ<<1, it is shown that the intensity peak of amplified phonon spectrum shifts to higher frequencies than that predicted by the linear theory unlike the case of ql<<1.
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  • Akihiro Kenmotsu, Takeshi Shinohara, Hiroshi Watanabe
    1972 Volume 32 Issue 2 Pages 377-381
    Published: February 05, 1972
    Released on J-STAGE: May 29, 2007
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    The nuclear magnetic resonances in metallic perovskite compounds Mn3AlC and Mn3GaC have been studied. In Mn3AlC the Al27 and Mn55 resonances are observed at 78 and 140 MHz, respective at 4.2 K. The corresponding hyperfine fields at Mn55 and Al27 and 133 and 70 kOe at 0 K, respectively. In Mn3GaC three signals are observed only in the ferromagnetic phase. The resonances occur at 120, 156.5 and 199 MHz at 136 K, which are assigned to Mn55, Ga69 and Ga71 nuclei, respectively. The hyperfine fields at Mn55 and Ga nuclei are 123 and 163 kOe at 0 K respectively.
    The temperature dependence of the frequencies and the echo intensity have been measured.
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  • Michio Sorai, Syûzô Seki
    1972 Volume 32 Issue 2 Pages 382-393
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The heat capacity was measured between 1.4 and 200 K. The magnetic contribution was determined by subtracting the lattice contribution from the overall heat capacity with the aid of effective frequency distribution function. The magnetic heat capacity showed two peaks at 2.3 K and at about 20 K. These features are satisfactorily accounted for by assuming a spin Hamiltonian of the form, (Remark: Graphics omitted.). The closest agreement between theory and experiment was obtained for J=−42.6k, j=−22.8k and J24=−7.6k. The sign of the parameters indicates that all the spin interactions are antiferromagnetic.
    It was concluded that one need not introduce any higher-order spin interactions to interpret the magnetic properties in the present system. To determine existing spin-interactions in a cluster, the complementary role of heat capacity and magnetic susceptibility measurements is emphasized.
    Also described in this paper is a new method to separate the magnetic heat capacity based on an effective frequency spectrum.
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  • Yorihiko Tsunoda, Yoshikazu Hamaguchi, Nobuhiko Kunitomi
    1972 Volume 32 Issue 2 Pages 394-399
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    Magnetic excitations in chromium near the Néel temperature were investigated using a neutron time-of-flight spectrometer. Above TN, the excitation was analyzed following the paramagnon model. The Fermi velocity vF is estimated to be vF=2.7(±1.3)×107 cm/sec at 1.105 TN in good agreement with the theoretical value. The integrated intensity of scattered neutrons displayed a maximum at 313 K and rapidly decreased as the temperature became lowered. The renormalization of spin wave velocity and the longitudinal spin fluctuation model are proposed as possible explanations.
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  • Tetsuya Ogushi, Yoshio Shibuya
    1972 Volume 32 Issue 2 Pages 400-415
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The experimental results on the linear and nonlinear VI plots which appear intrinsically in type I and type II superconducting thin films are discussed in terms of the relevant theories, especially, of a long range Coulomb-type interaction between vortices.
    The VI plots is quite linear for films with relatively large κ values near Tc and at low temperatures in low applied magnetic fields. They show similar behaviours to those of bulk superconductors. However, these properties become to be obscure because of the appearance of nonlinear VI plots, roughly speaking, in the higher magnetic fields than that in which the lattice spacing of vortices “a”<<(2×2λ2)⁄d, where d, the film thickness and λ is the penetration depth.
    The behaviours of the VI plots in this region seem to be explained by assuming a fluid-like vortices structure.
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  • Masaaki Kontani, Tatsumi Hioki, Yoshika Masuda
    1972 Volume 32 Issue 2 Pages 416-428
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The nuclear spin lattice relaxation time T1 of the 3d- and 4d-series impurities (V, Mn, Co, Cu, Nb, Mo, Ru, Rh, and Pd) dissolved dilutely in Fe metal has been measured as a function of external magnetic field strength by pulsed NMR technique. The relaxation mechanisms for these impurities in high external magnetic field are discussed in terms of the hyperfine interactions with the s- and the d-band electrons. The density of states of the impurity d- electrons in the Fe metal is calculated using the Wolff and Clogston model and used for the calculation of the relaxation time. External field dependence of the relaxation time was discussed by the spin wave mechanism. The relaxation mechanism in the ferromagnetic metal proposed by Weger has been also derived by the susceptibility formalism.
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  • Yasuo Tokunaga, Singo Ikeda, Jun Watanabe, Taiichiro Haseda
    1972 Volume 32 Issue 2 Pages 429-430
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    Cross relaxation among Cu2+ ion pairs in Cu(NO3)2 2.5H2O has been studied by observing high frequency susceptibility by the use of a modified Hartshorn bridge (200 Hz∼200 kHz) and a frequency shift method (1.6 MHz∼20 MHz) under external field up to 50 kOe at temperature down to 1.6 K. Adiabatic susceptibility of this ground state singlet spin system revealed an unusual dependence on external magnetic field, which is in good agreement with theoretical calculation.
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  • Kentaro Yoshida
    1972 Volume 32 Issue 2 Pages 431-440
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    In vacuum co-deposited film of manganese and aluminium, a disordered layer structure is found in the intermediate stage of heating, at a temperature between 500 and 600°C, when the film has a composition in the range between 25 and 35 at. per cent of manganese. Its reciprocal lattice is investigated by electron diffraction. The structure is interpreted on the basis of δ(Mn–Al) structure. For the combined atomic layer ot 8.5 Å thickness parallel to (010) plane, another stacking position denoted by C than the usual one denoted by B in the δ(Mn–Al) structure is found to be possible. This position gives a new stacking order of AC which may be considered as an antipode of the δ(Mn–Al) structure, the usual δ(Mn–Al) structure being denoted by AB-structure. Here the lateral displacements of B- and C-layers relative to A-layer are approximately given by am⁄2 and cm⁄2 respectively, where am and cm are two translational vector parallel to the layer. The observed extinction rule for the diffraction spots and their complicated arrangement are well explained by considering the coexistence of both AB- and AC-structures in the film.
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  • Kazuko Inoue, Yoji Nakamura
    1972 Volume 32 Issue 2 Pages 441-446
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The electrical resistivities of Gu–Mn and Ag–Mn alloys with Mn concentration from 1 to 25 and 22 atomic percents, respectively, have been measured from 4 to 1000 K. The temperature dependence of the resistivity in both alloys shows no sharp anomaly but a broad maximum above the Néel temperature. Above this maximum temperature, the resistivity decreases with increasing temperature. The magnetic part of the resistivity is estimated by subtracting the resistivity of pure Cu or Ag from the observed one. For all the Mn concentrations studied, the temperature dependence of the magnetic resistivity is well expressed as Rmag(T)=−c(X+Yc)ln(T2+Z2c2)1⁄2+R0, where c is the concentration of Mn, T the temperature and X, Y, Z and R0 the constants. This fact suggests that in concentrated alloys the RKKY interaction between Mn impurities plays an important role in the s-d exchange scattering of conduction electrons.
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  • Kunio Saiki, Tetsuo Fujita, Yasuharu Shimizu, Sanshiro Sakoh, Nobuhiko ...
    1972 Volume 32 Issue 2 Pages 447-450
    Published: February 05, 1972
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    Fine particles of metallic lithium of diameters from about 3000 to 100Å were prepared by the evaporation method in an inert gas atmosphere. The relaxation of conduction electron spins in those particles was measured by an X-band spectrometer at room temperature. The line of the electron spin resonance broadened from 2.7 to 8.2 Oe as the particle size was reduced from about 3000 to 1000Å. This effect is explained by the spin reverse scattering at the surface of the particles. As the particle size was further reduced, the line narrowed remarkably. The width for 100Å particles was 1.9 Oe. This effect is discussed in connection with the quantization of electronic energy levels in fine particles. The measurement was also carried out at liquid helium temperature. However, on remarkable change was observed.
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  • R. D. Hutchens, V. U. S. Rao, J. E. Greedan, R. S. Craig
    1972 Volume 32 Issue 2 Pages 451-454
    Published: February 05, 1972
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    The heat capacity of the cubic CexLa1−xPd3 ternary alloys have been measured in the temperature range 1.5 to 10 K. The alloys consist of single phases except in the region 0.3<x<0.5. These measurements supplement earlier measurements on the electrical resistivity on these alloys which had revealed the Kondo side-band effect. The specific heats for the compositions x=1.0 and 0.8 were found to obey the equation CPTT3 with a high value for γ. The heat capacities for the remaining compositions showed marked deviations from this simple relation, and exhibited well-defined minima in the CPT versus T2 curves in some cases. These deviations were attributed to the influence of paramagnons. The significance of these results are discussed in terms of a model for the electronic structure of these alloys.
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  • Jean-Marie Donnini
    1972 Volume 32 Issue 2 Pages 455-461
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    Photoconduction activation energies have been investigated in some pure and doped aromatic crystals. The interpretation of the data in terms of the Ishihara and Nakada model (J. Phys. Soc. Japan 28 (1970) 667) gave the positions of the conduction bands for the pure crystals. The results are in agreement with a Wannier exciton model proposed earlier in the discussion of the optical absorption spectra in aromatic crystals.
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  • Kazuo Morigaki, Shigeru Maekawa
    1972 Volume 32 Issue 2 Pages 462-471
    Published: February 05, 1972
    Released on J-STAGE: May 29, 2007
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    Electron spin resonance of donor electrons has been investigated in phosphorus-doped silicon at 46GHz and in the temperature range from 1.5 K to 4.2 K. From the temperature variation of the resonance line due to the donor clusters, that consist of more than several donor atoms, it is concluded that the exchange coupling between donor atoms within the cluster is antiferromagneric. The analysis of the peak shift of the central line indicates that there exists a weak ferromagnetic exchange coupling between the donor clusters. One of the striking result in our experiment is that two resonance lines separated by 0.8 Oe from each other at 1.5 K are observed at the donor concentration of 1.74×1018 cm−3 which belongs to the intermediate concentration region, that is the transition region from the non-metallic to metallic type of impurity conduction. Both resonance lines are interpreted as being due to two types of the donor clusters which may correspond to the non-metallic and the metallic region in the crystal.
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  • Akira Yoshikawa, Hideo Takezoe, Ikuo Maruyama, Ryumyo Onaka
    1972 Volume 32 Issue 2 Pages 472-482
    Published: February 05, 1972
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    New absorption bands have been observed in the spectra of single crystals of KCl:Ag irradiated with the C band light (287 nm) at room temperature. Some of the absorption bands are attributed to the same center (named X in this paper) since irradiation with light at these absorption bands gives rise to an identical luminescence at 678 nm. The positions of the observed absorption bands of the X center are 330 nm (X1), 283 nm (X2) and 278 nm (X3) at liquid nitrogen temperature. In addition to these bands, six other absorption bands belonging to the X center have been found from the excitation spectra of the luminescence, namely, 267 nm (X4), 263 nm (X5), 228 nm (X6), 435 nm (Y1), 403 nm (Y2) and 390 nm (Y3). The 678 nm emission shows a noticiable polarization correlation with the exciting light. From the studies of the azimuthal dependence of polarized luminescence and a theoretical consideration by use of molecular orbitals, the X center is identified with the paired Ag ions orientated along ⟨110⟩ directions of the crystals.
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  • Akio Honma
    1972 Volume 32 Issue 2 Pages 483-493
    Published: February 05, 1972
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    New optical absorption bands in KCl containing Ag ions, all of which have the identical fluorescent emission at 678 nm, are investigated theoretically by adopting the model that these bands arise from the transitions between the electronic energy levels of a pair of Ag ions occupying the two adjacent anion sites in KCl. The wave functions based on the LCAO approximation are used under the assumption that any product of two overlap integrals is negligible in comparison with unity. Further the Mulliken approximation is adopted to estimate various two-center integrals. By assigning some observed bands to optically allowed transitions in a satisfactory way, the parameters contained in the matrix elements of the Hamiltonian are determined. By use of these parameters, the intensities and the energies of forbidden transitions are calculated and then they are compared with experiments. The agreement is quite good.
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  • Chikara Sugiura
    1972 Volume 32 Issue 2 Pages 494-496
    Published: February 05, 1972
    Released on J-STAGE: May 29, 2007
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    The Kβ emission spectrum and the K absorption spectrum for Cl ion in LiCl have been obtained with a 50 cm bent quartz crystal vacuum spectrograph. The Kβ emission band is considerably wide. The obtained spectra are compared with the results of Kunz’s band calculation and a reasonable agreement is obtained between them.
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  • Kazunari Ikuta
    1972 Volume 32 Issue 2 Pages 497-499
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The governing differential equation of the self-consistent relativistic neutralized electron beam is exhibited. A reasonable simple solution with spherical beam-vacuum interfaces is also given.
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  • Masataka Ariyama, Yukio Mizuno, Tosio Sanematu
    1972 Volume 32 Issue 2 Pages 500-505
    Published: February 05, 1972
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    For 1S and 3S Rydberg series of helium, it is successfully attempted to improve Smith’s Hartree-Fock type variational calculation of the asymptotic values of quantum defect, Δ, by adding only a few configurational wavefunctions of analytic form to the primary Hartree-Fock type one. The best values of non-linear parameters in the added configurational wavefunctions are chosen on the basis of the minimum principle for Δ, which is here rederived straightforwardly from a well-known theorem on Rayleigh-Ritz’s variational treatment. The integer parts of Δ’s, that have been left indefinite in all the calculations by predecessors, are determined pure-theoretically with the help of another inequality relation which is also a direct consequence of the same theorem.
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  • S. Chandra, S. C. Srivastava
    1972 Volume 32 Issue 2 Pages 506-509
    Published: February 05, 1972
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    Dielectric constant and dielectric loss at 3.8 GHz of six haloalkanes (viz. 1, 3-Dibromopropane; 1, 4-Dibromobutane; 1, 5-Dibromopentane; 1, 6-Dibromohexane; 1, 1-Dichloro-1-Nitroethane and 1, 1, 2, 2-Tetrabromoerhane) in solutions of a wide range of viscosities are reported in this paper. It is found that the plots of logτs vs logη are not straight lines. The data has been interpreted in terms of viscoelastic behaviour of the solvents.
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  • Yuji Tanaka, Keiji Oya, Takayoshi Okuda, Kenzo Yamamoto
    1972 Volume 32 Issue 2 Pages 510-516
    Published: February 05, 1972
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    With the aim of realization of an injected type of Tokamak device, the drift motion and instabilities of a plasma in a curved magnetic field are studied experimentally. For this purpose a curved magnetic field with a straight section is constructed. The plasma is produced by a coaxial gun which is installed at the end of the straight section. It is found that the transmission of the plasma is closely related to the compensation of polarization field through the straight section and to the occurence of an instability.
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  • Heiji Sanuki, Jiro Todoroki
    1972 Volume 32 Issue 2 Pages 517-521
    Published: February 05, 1972
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    A generalized Korteweg-de Vries type equation is obtained for small but finite amplitude waves in plasma by treating the Vlasov equation perturbation theoretically. The influence of ion Landau damping on the ion sound soliton is discussed. Even if the ion acoustic wave is stable, it is shown that under a certain condition the amplitude of soliton grows in time. In the case of the unstable ion acoustic wave, the amplitude of soliton saturates at the finite value.
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  • Atsushi Mase, Takashige Tsukishima
    1972 Volume 32 Issue 2 Pages 522-526
    Published: February 05, 1972
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    Experimental results on a feedback control of a self-excited electrostatic wave in a plasma are compared with a theory where an internal feedback is linked with the external feedback to give a unified account for the feedback control mechanism. The frequency and the damping rate of the self-excited wave undergo some changes upon the application of the external feedback. A good quantitative agreement between theory and experiment is obtained.
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  • Mineo Yamauchi
    1972 Volume 32 Issue 2 Pages 527-534
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    Propagation of two ion waves, a fast ion wave and a slow one, was observed in an ion drifting plasma. When the exciting frequency was above the ion plasma frequency, the slow wave disappeared but the fast one did not. The two waves were identified as the ion acoustic waves riding on the ion drifting plasma in the frequency range much below the ion plasma frequency. The fast wave, at frequencies above the ion plasma frequency, was essentially the ion free streaming wave. Dispersion relation of ion free streaming wave was derived on the assumption that the drifted Maxwellian distribution as the initial distributed. The computed phase velocity and damping rate were in agreement with the experimental results.
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  • Masashi Kako, Tsuguhiro Watanabe
    1972 Volume 32 Issue 2 Pages 535-542
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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    The following equation is shown to govern the finite-amplitude ion-wave propagating through a macroscopic plasma with an ion-beam in the neighborhood of a marginally stable state:
    (Remark: Graphics omitted.),
    where a denotes the deviation of the plasma system from the marginal state. It is found that wave-trains or solitary waves exist. The temporal evolution of initial disturbances is investigated numerically.
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  • Noriyoshi Sato, Akihiko Sasaki
    1972 Volume 32 Issue 2 Pages 543-551
    Published: February 05, 1972
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    Propagation and damping of low-frequency perturbations produced by a grid are measured in an almost isothermal plasma. The phase velocity and the damping factor are observed to depend to the position over about half a wavelength from an exciting position. Beyond there, Landau-damped ion acoustic waves propagate. The phenomena observed can be interpreted as ion ballistic contributions to ion acoustic waves.
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  • Kanefusa Gotoh, Isamu Nakata
    1972 Volume 32 Issue 2 Pages 552-558
    Published: February 05, 1972
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    The effect of a uniform and parallel magnetic field upon the instability of a Bickley jet is investigated at small magnetic Reynolds numbers. The equation of disturbance is solved numerically and it is shown that the flow is stabilized with the magnetic field. The change of the lowest critical Reynolds number Rc is shown graphically. When magnetic field is measured by the parameter S (=\sqrtMR), where M is the Hartmann number and R is the Reynolds number, Rc is caused by the two-dimensional disturbance provided 0≤S<5.5. For S>5.5, Rc is expressed as Rc=3.3 S and the responsible disturbance is the three-dimensional one which propagates at angle cos−1(5.5/S) to the direction of the basic flow.
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  • Tatsuo Tokuoka
    1972 Volume 32 Issue 2 Pages 559-563
    Published: February 05, 1972
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    The optical yield and birefringent phenomena of the generalized perfectly plastic isotropic dielectrics are theoretically investigated. The mechanical and optical constitutive equations of the plastic perfect dielectrics are derived from the rate-type elastic constitutive equations, which are assumed to hold for the elastic stretching. The birefringence and extinction angle are calculated in simple shear deformation for special plastic dielectrics of grade two.
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  • Akira Yoshizawa
    1972 Volume 32 Issue 2 Pages 564-566
    Published: February 05, 1972
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    Laminar viscous flow past a semi-infinite flat plate set parallel to a uniform stream is studied using a matching procedure. A solution connecting the potential flow region and the leading edge region is found based on the modified Oseen approximation. Undetermined constants included in the Stokes-type solution valid near the leading edge are determined. The results are found to be in good agreement with those of recent numerical analyses.
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  • Mitsunori Akiba, Yasuki Nagai, Kazuo Hisatake
    1972 Volume 32 Issue 2 Pages 567
    Published: February 05, 1972
    Released on J-STAGE: May 29, 2007
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  • Junpei Sanada, Kazuo Kondo, Seiji Seki, Yoshihiro Tagishi, Yoichi Noji ...
    1972 Volume 32 Issue 2 Pages 568
    Published: February 05, 1972
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  • Eiichi Takasaki
    1972 Volume 32 Issue 2 Pages 569
    Published: February 05, 1972
    Released on J-STAGE: May 29, 2007
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  • Hakaru Masumoto, Kiyoshi Watanabe, Shigehiro Ohnuma
    1972 Volume 32 Issue 2 Pages 570
    Published: February 05, 1972
    Released on J-STAGE: June 01, 2007
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  • Naokatsu Sano, Masakazu Teraoka, Kenji Shimizu, Junkichi Itoh
    1972 Volume 32 Issue 2 Pages 571
    Published: February 05, 1972
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  • Kengo Adachi, Kiyoo Sato, Hisao Watarai, Tadashi Ido
    1972 Volume 32 Issue 2 Pages 572
    Published: February 05, 1972
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  • Kengo Adachi, Kiyoo Sato, Kiyotaka Yamauchi, Masayoshi Ohashi
    1972 Volume 32 Issue 2 Pages 573
    Published: February 05, 1972
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  • Tadao Ishii
    1972 Volume 32 Issue 2 Pages 574
    Published: February 05, 1972
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  • Hajime Maeda
    1972 Volume 32 Issue 2 Pages 575
    Published: February 05, 1972
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  • Akihiko Ishitani, Masao Maeda
    1972 Volume 32 Issue 2 Pages 576
    Published: February 05, 1972
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  • Tadashi Kobayashi, Kazuo Furukawa, Kenzi Hukuda
    1972 Volume 32 Issue 2 Pages 577
    Published: February 05, 1972
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  • Tadashi Kobayashi, Masaaki Yakabe, Kenzi Hukuda
    1972 Volume 32 Issue 2 Pages 578
    Published: February 05, 1972
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  • Tatsuo Kanashiro, Takashi Ohno, Toshihiko Taki, Mitsuo Satoh
    1972 Volume 32 Issue 2 Pages 579
    Published: February 05, 1972
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