Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 32, Issue 5
Displaying 1-50 of 63 articles from this issue
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  • Excited Levels in 190Hg and a 24.5 ns Isomer
    Takashi Inamura, Yoshihiko Tendow, Shoji Nagamiya, Akira Hashizume
    1972 Volume 32 Issue 5 Pages 1163-1168
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1163
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    Time distributions of γ-rays from the 181Ta(14N, 5n)190Hg reaction were observed between natural beam bunches of a cyclotron. Excitation functions and anisotropies of γ-rays were also measured. The 418 keV (2+→0+), 626 keV (4+→2+), and 723 keV (6+→4+) γ-rays from 190Hg have been found to decay with a half-life, T1⁄2=24.5±0.7 ns. A new level scheme of 190Hg is proposed; the 8+, 7−, and 5− levels are placed at 2468, 2016, and 1828 keV, respectively, and the 24.5 ns isomer is assigned to a 10+ state tentatively placed at 2604 keV.
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  • Experimental Investigation of the 91Zr(p, t)89Zr Reaction at 51.7 MeV
    Takashi Awaya, Haruko Ohmura, Toshiyuki Ishimatsu, Tsutomu Tohei, Take ...
    1972 Volume 32 Issue 5 Pages 1169-1174
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1169
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    The 91Zr(p, t)89Zr reaction has been studied by using 51.7-MeV protons in order to obtain informations on reaction mechanism. Emitted tritons were analyzed by a broad range magnetic spectrometer with a 200-channel counter array. Angular distributions of the tritons were obtained for the thirteen states in 89Zr. They were compared with the DWBA calculations in which a new formalism for form factors was used. Calculated patterns of the angular distributions for the lowest four one-neutron hole states in 89Zr less fitted the experimental results in comparison with the case for the higher states. Absolute values of the observed cross sections for the formers agreed with the calculated ones within a factor 2, but were strongly enhanced for the latters.
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  • Analysis of the 91Zr(p, t)89Zr Reaction
    Takashi Awaya, Haruko Ohmura, Ching Liang Lin
    1972 Volume 32 Issue 5 Pages 1175-1181
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1175
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    The analysis of the reaction has been done by using a zero-range DWBA with a new form factor. The interactions between the incident proton and each of the transferred neutrons were independently considered. Woods-Saxon wave functions were used for bound states of the transferred neutrons. These treatments made it possible to compare the absolute values of the calculated cross sections with the observed values. Spin assignments for the states in 89Zr below 3 MeV were done. Strong enhancements seem to exist for the pair transitions to the states in 89Zr which correspond to the ones in 90Zr(p, t)88Zr reaction. Possibility of the contribution of relative D-states between the transferred neutrons is discussed to interpret the discrepancies between the observed and calculated angular distributions for the one-hole states in 89Zr.
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  • Dielectric Properties of Mixture of Lauryl-Laurate and Hexacosane
    Hideki Miyaji, Yoshihito Ohde, Kenjiro Asai
    1972 Volume 32 Issue 5 Pages 1182-1187
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1182
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    Dependence of dielectric loss on the concentration of polar molecules is investigated for the mixtures of long chain compounds (lauryl lauratehexacosane). The experimental results are well explained by the two site model taking account of interaction of ester molecules and this interaction energy quite reasonably determines the critical concentration of the separation of two phases (an ester poor solid solution and an ester rich phase). The critical concentration is also determined by differential thermal analysis and dielectric measurement and the results obtained are quite consistent with the calculated value from the interaction energy.
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  • Localized Spin Wave Spectrum of Antiferromagnet with Two Different Impurities
    Sasuke Miyazima, Ayao Okiji
    1972 Volume 32 Issue 5 Pages 1188-1201
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1188
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    The localized spin wave associated with two different impurities in an insulating b. c. c. antiferromagnet is investigated within the linear spin wave theory. The four cases with regard to the relative position of two impurities which include the case of nearest neighbor positions are considered. The energy of localized spin wave is calculated for the various values of exchange integrals and the magnitude of impurity spin. It may be concluded that some of the localized spin wave modes of the first impurity are not affected even if the second impurity is on the vicinity of the first impurity. When the same two impurities are on the same sublattice the larger interferential effect on the localized spin wave energy is induced than on the different sublattice. The dependence of the localized spin wave energy on the distance between two impurities is discussed briefly.
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  • Role of Three-Phonon Normal Processes in the Phonon Conductivity of an Insulator
    K. S. Dubey, G. S. Verma
    1972 Volume 32 Issue 5 Pages 1202-1204
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1202
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    In the present work the role of three-phonon normal processes is studied in the framework of Callaway’s theory of Phonon conductivity of an insulator under the conditions τN−1>τR−1, τN−1<τR−1 and τN−1<<τR−1 where τR−1=τB−1+τpt−1+τU−1. Use also made of a parameter ‘a’, which is a measure of the relative strengths of normal and Umklapp processes and is equal to τN−1⁄τU−1 in Callaway’s model. It is shown that for τN−1<<τR−1 and ‘a’ approaching 10−3 Callaway’s model gives good description of phonon conductivity of Ge in the temperature range 2 to 100 K. For τN−1>>τR−1 Callaway’s theory gives not only the smaller values of phonon conductivity but also leads to wrong temperature dependence in the range 20–100 K.
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  • Transverse Correlation and Transverse Mode in Simple Liquid
    Chiaki Murase
    1972 Volume 32 Issue 5 Pages 1205-1216
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1205
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    Properties of the transverse correlation and transverse modes in the dynamical region in a simple liquid are studied on the basis of the generalized Langevin equation. Under the assumption of Gaussian decay of the time correlation of the random forces, the molecular expressions for the transverse current correlation function and the transverse response function are obtained. Numerical calculations are made for the liquid argon at T=84.25 K. The analysis of spatial correlations shows that the local correlations in a liquid may conveniently be described by two parts, the radial and the angular parts. The damping of the correlation Δ(k) shows a very weak dependence on the wave number k. The dispersion relation of the transverse mode is obtained from the maximum of the correlation function. The analytical properties of the pole of the response function shows the possibility of the propagation of the transverse mode in the case where G⁄Δ2>0.294, G being related with the modulus of rigidity.
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  • Electrical and Magnetic Properties of the Chromium Sulfide with Deviation from Stoichiometric Composition Cr2S3
    Masao Mikami, Kenzo Igaki, Nobumitu Ohashi
    1972 Volume 32 Issue 5 Pages 1217-1221
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1217
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    On assuming the random distribution of Cr2+ ions and occupation of intrinsic Cr-vacancy sites, the relation between the equilibrium sulfur pressure PS2 and the deviation from the stoichiometric composition Cr2S3 was calculated and was confirmed experimentally. The magnetic susceptibility and the electrical resistivity were measured on single crystals with the controlled deviation, prepared by equilibrating at 1270 K as-grown single crystal with various sulfur pressures.
    The magnetization of Cr2S3 below Néel temperature may originate from the spin alignment with larger component perpendicular to c-axis and depends sensitively on the deviation from the stoichiometric composition. Electrical conductivity was explained by the hopping mechanism between Cr3+ and Cr2+ ions.
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  • High-Field Dependence of the Magnetization in Fe–Al Alloys
    Tokuo Wakiyama
    1972 Volume 32 Issue 5 Pages 1222-1226
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1222
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    An increase in magnetization with an increase of the magnetic field well above technical saturation were measured at 4.2 K for single crystals of Fe–Al alloys in the directions of easy magnetization in the fields up to 55 kOe which is produced by a superconducting magnet, using an integrating digital voltmeter. From the slope of the linear part of the magnetization curves in the high fields, the magnitudes of the high-field susceptibility were estimated to be 4.4, 5.0, 4.8, 6.1, 7.2, 53, 83 and 88×10−4 emu/mole for 17.3, 20.1, 23.0, 24.9, 25.0, 27.1, 27.7 and 28.1 at.% Al–Fe, respectively. The observed behavior of the composition dependence of the high-field susceptibility can be interpreted on the basis of either the Pauli paramagnetism of 3d electrons, or a coexistence of ferromagnetic Fe3Al phase and antiferromagnetic FeAl phase.
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  • Parallel Pumping of Spin-Waves in an Orthorhombic Antiferromagnet
    Hitoshi Yamazaki
    1972 Volume 32 Issue 5 Pages 1227-1233
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1227
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    By means of the parallel pumping technique, unstable growths of spin-waves are observed in antiferromagnetic CuCl22H2O at a pumping frequency of 8.912 GHz. The threshold rf-field hc for the onset of parallel pumped spin-wave instability is theoretically obtained for antiferromagnets with the anisotropy of orthorhombic type. In addition to excitation of two spin-waves of the same branch in the spin-wave spectrum, excitation of two spin-waves of the different branches is also considered. The threshold field hc is experimentally obtained for the low-frequency branch when the static and the rf-fields are both applied parallel to the spin easy axis. Using the theoretical expression for hc, the experimental data are deduced to the spin-wave linewidth ΔHk which increases linearly with k2 for small k and is proportional to T4.6 in the temperature range from 1.2 to 1.8 K.
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  • Size Effect of Metallic Fine Particle of Cu
    Shun-ichi Kobayashi, Toshihiro Takahashi, Wataru Sasaki
    1972 Volume 32 Issue 5 Pages 1234-1236
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1234
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    The NMR line shape, relaxation time and the static susceptibility of metallic Cu fine particles (∼50Å) are measured at liquid He temperatures. The line shape shows an enhanced spin paramagnetism which can be explained as anomalies due to finite spacing of the electron energy levels with strong 1-s coupling. The spin-lattice relaxation time is shorter than bulk value, contrary to expectations.
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  • Nuclear Magnetic Resonance in Palladium-Aluminum and Palladium-Vanadium Alloys
    Shohtaro Kohzuki, Kunisuke Asayama
    1972 Volume 32 Issue 5 Pages 1237-1241
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1237
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    The concentration dependence of nuclear spin-lattice relaxation time, T1, and the Knight shift of Al27 and V51 in Pb–Al and Pd–V alloys have been measured in the temperature range from 1.4 to 4.2 K. The measured T1T and the Knight shift of impurities in diluted Pd–Al and Pd–V alloys are 24.8±3.0 sec K, −0.002±0.005% and 3.0±0.2 sec K, +0.75±0.02%, respectively.
    A consistent explanation for the electronic state in the impurity site is given using the results of T1 and the Knight shift. Especially, the results in the dilute Al alloys are discussed with the recent Kanamori-Terakura theory which has been established for ferromagnetic Ni alloys.
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  • Positron Lifetimes in Oxides
    Masayasu Noguchi, Takefumi Mitsuhashi, Toshinobu Chiba, Takaho Tanaka, ...
    1972 Volume 32 Issue 5 Pages 1242-1247
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1242
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    Lifetime spectra of positrons is oxides were measured. Densities of oxygen ions corrected for the ionicities are rather good parameters describing τ1−1 and thus positrons may be itinerant in oxides. The annihilation rates τ1−1 are about 1.5 times as large as those which are calculated on the assumption that the positrons distribute homogeneously.
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  • Spin Arrangements in Magnetic Compounds of the Rocksalt Crystal Structure
    Yuji Yamamoto, Takeo Nagamiya
    1972 Volume 32 Issue 5 Pages 1248-1261
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1248
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    The ground state spin arrangements in magnetic compounds of the NaCl type structure are studied by consideration of exchange interactions between nearest neighbors (J1) and between next-nearest neighbors (J2). Ferromagnetic arrangement as well as antiferromagnetic arrangements of the first kind, second kind, and improved first kind are obtained in different intervals of the parameter γ=J2⁄J1. Each of the three antiferromagnetic arrangements is degenerate due to the cubic symmetry of the crystal and the spin arrangement indefinite. Since the monoxides of the iron group elements are slightly distorted below the Néel point, the relevant small changes in J1 and J2 are taken into account to see if the degeneracy is removed. It turns out that the degeneracy is removed partially or completely. Helical spin arrangements appear in certain intervals of γ. Finally, anisotropy energy of the form DSz2 is taken into account, but the degeneracy still remains unlifted in some cases.
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  • Galvanomagnetic Effect of TlBr
    Yunosuke Makita, Koichi Kobayashi
    1972 Volume 32 Issue 5 Pages 1262-1269
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1262
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    Galvanomagnetic studies were performed for the photocarriers in TlBr with the transient method between 100 K and 1.8 K. The measurements of Hall effect indicate that the photoconduction is of two-carrier. The change of the sign of the Hall angle is observed as the temperature decreases. It is observed that at relatively high temperature (>20 K) the dominant contributor to the current is electrons, but at low temperature (<3.8 K) it is holes which have high Hall mobilities of more than 2×104 cm2/volt sec. The angular dependence of magnetoconductivities at 1.8 K shows the almost spherical shape of the constant energy surface at the top of the valence band.
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  • Gradient-Elastic Tensor in Alkali Bromide Crystals
    Tatsuo Kanashiro
    1972 Volume 32 Issue 5 Pages 1270-1280
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1270
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    The S11 components of the gradient-elastic tensor at alkali and bromine nuclear sites in all alkali bromide crystals are determined by the method of nuclear magnetic resonance acoustic saturation. The obtained S11 values are compared with the theory which takes account of the contribution from the overlap of ion cores in addition to that from the point charges. The overlap integrals are calculated over the first and second nearest neighbor ions. The agreement between the experimental and calculated results seems to be satisfactory.
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  • Lifetime Spectra of Positrons in ZrO2
    Takefumi Mitsuhashi, Masayasu Noguchi, Toshinobu Chiba, Akira Ono, Mas ...
    1972 Volume 32 Issue 5 Pages 1281-1286
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1281
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    Lifetime spectra of positrons for variously prepared ZrO2 are described essentially by a single parameter, a particle size. A simple model to describe τ1, τ2, τ3, and I3 is developed. There is a discrepancy between a particle size obtained by an x-ray diffraction pattern and that deduced from a lifetime spectrum for a sample at the initial stage of the crystallization.
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  • Electrical, Mechanical and Electromechanical Orders of State Shifts in Nonmagnetic Ferroic Crystals
    Kêitsiro Aizu
    1972 Volume 32 Issue 5 Pages 1287-1301
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1287
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    The concepts “ferromagnetic,” “ferroelectric” and “ferroelastic” can be unified and generalized into “ferroic.” In a previous paper it has been found that there are, in all, 773 possible species of ferroic crystals, 212 of which are nonmagnetic. In the present paper, only nonmagnetic ferroic crystals are dealt with. The concepts of electrical, mechanical and electromechanical orders are introduced for state shifts. The ferroelectric (or ferroelastic) state shifts are recognized as electrically (or mechanically) first-order state shifts. Higher-order state shifts are also possible. The three kinds of orders are group-theoretically determined for each state shift in each species. It is seen from this that no species can have more than two unequal electrical orders, more than three unequal mechanical orders or more than two unequal electromechanical orders of state shift. Every species with unequal orders of states shift is “factorized” into species with a single order of state shift.
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  • Topographic Study of Ferroelectric NaNO2 Crystals. II. Mechanism of Polarization Reversal
    Shigeo Suzuki, Mieko Takagi
    1972 Volume 32 Issue 5 Pages 1302-1312
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1302
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    X-ray topographic study was made of a sodium nitrite (NaNO2) single crystal which had been partially polarized with an external d. c. electric field at room temperature. Images with characteristic diffraction contrast found in topographs of the crystal suggest the following process of polarization reversal. By increasing thickness of pre-existing domain boundary walls the intermediate state regions having the same crystal structure as that of the domain boundary walls, are formed first, and on the next step the intermediate state regions once formed are eroded by the domains having the right direction of polarization. Rotation of NO2 radicals by 180° around their O–O axes will be the molecular mechanism of the polarization reversal under electric field at room temperature.
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  • Stochastic Analysis of an Oscillating Chemical Reaction
    Tetsuo Nakanishi
    1972 Volume 32 Issue 5 Pages 1313-1322
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1313
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    The rate equations of a model of certain autocatalytic chemical reaction which is extremely far from the thermodynamic equilibrium are represented by the non-linear differential equations of Volterra type. By using the stochastic model of this chemical reaction system, the sample processes of the reaction process are traced by computer simulation and the characteristic behaviour can be analyzed by the statistical analysis of the sample process without any difficulty resulting from non-linearity of the reaction system. That is, the behaviour of the reaction process near the stationary state shows the qualitative nature of the result from the linearized equation of the deterministic rate equation, but the reaction process far from the stationary state behaves in essentially different way from that of ‘near the stationary state.’
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  • Instability Theory of Biological Motility. I. On the Statistical Mechanical Nature of Biological Motility
    Hiroshi Shimizu
    1972 Volume 32 Issue 5 Pages 1323-1330
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1323
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    A theory biological motility is proposed: biological motility is based on the ordered motion of motile enzymes at an elementary process of mechanochemical conversion. The ordered motion is interpreted as a dissipative structure of motile enzyme produced by the flow of free energy in chemical reaction ATP→ADP. Non-linear equation is given for the rate of elementary process in closed analogy with dynamics of laser. Biological motility does, therefore, appear above thresholds with respect to chemical affinity of ATP as well as reaction rate. Mechanochemical conversion gives interesting properties to chemical rate processes catalyzed by motile enzyme. Experimental methods for the proof of the present theory is suggested. Hill’s equation of muscle contraction is derived by applying the present theory.
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  • Tertiary Structure of Proteins. I. Representation and Computation of the Conformations
    Ken Nishikawa, Tatsuo Ooi, Yoshinori Isogai, Nobuhiko Saitô
    1972 Volume 32 Issue 5 Pages 1331-1337
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1331
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    A protein conformation can be computed by connecting peptide units of usual trans-planar structure successively with a given set of dihedral angles \varphi and ψ. It is, however, not easy to generate the native conformations such as myoglobin and lysozyme by the computation. In order to show the discrepancy between the native conformation and the computed one, we have introduced a map, where the mutual distance between Cα-atoms of i-th and j-th residue, rij, is listed against the residue number, in row and column. This map represents a tertiary structure of the protein (e. g. α-helix, β-structure) as the characteristic patterns. It becomes possible to estimate the difference of the computed conformation from the native one numerically by comparing the corresponding maps. The improvement of the dihedral angles, \varphi and ψ, as made by minimizing the deviation of the computed map from the native one on both myoglobin and lysozyme.
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  • Tertiary Structure of Proteins. II. Freedom of Dihedral Angles and Energy Calculation
    Ken Nishikawa, Tatsuo Ooi
    1972 Volume 32 Issue 5 Pages 1338-1347
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1338
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    By using the procedure described in a preceding paper, several sets of \varphi and ψ are obtained which reproduced similar conformations to the native structure of lysozyme or myoglobin. Contrary to the expectation, the value of f has no maximum along a line connected any two of the minima in the 2n-dimensional phase space. This result shows the existence of many solutions for \varphi and ψ which generate the native conformation under restricted condition of fixed geometry in the main chain. Energy calculation is performed on the conformations obtained above to examine atomic collisions along the main chain. After refinement to remove the collisions, a conformation is finally obtained for lysozyme which has a total energy of −270 kcal/mol and still has an low value of f. Similarly a conformation can be found for myoglobin having an energy of −580 kcal/mol in total.
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  • Initial Distributions of Vibrational and Rotational Populations Predicted by Statistical Model for Two Diatomic Species Split from Four-Atomic Complex
    Masahiro Kimura, Sigeru Watanabe, Tadao Horie
    1972 Volume 32 Issue 5 Pages 1348-1358
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1348
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    Initial and nonthermal population distributions among the rotational and vibrational levels of the two diatomic species split from a four-atomic collision intermediate have been studied on the basis of the statistical model which ensures that the angular momentum of the whole system is conserved throughout the course of the splitting. A number of curves have been calculated with the aid of an electronic computer, for the initial rotational population distribution (i. r. p. d.) and the initial vibrational population distribution (i. v. p. d.). The i. r. p. d. computed varies considerably, according as the moments of inertia of the diatomic fragments are equal to or different from each other, and the excess energy E possessed by the intermediate is large or small compared with the vibrational quanta of the fragments. On the contrary, the i. v. p. d. computed remains unchanged in most cases, when the vibrational energy is expressed in the unit of E. Some of the population distributions predicted by the statistical model are compared with the experimental observations, for a few examples available to date.
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  • Instabilities of Extraordinary Wave in a Collision-Dominated Plasma
    Noboru Shimomura
    1972 Volume 32 Issue 5 Pages 1359-1367
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1359
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    The instabilities of the extraordinary wave are studied by taking the effect of finite wave number into account. It is assumed that the unperturbed velocity distribution of electrons is a spherical shell in velocity space and the electron’s collision frequency ν with neutral particles depends on the magnitude of their velocities v0, namely, ν∝v0h. The dispersion relation is obtained for the case in which the refractive index is much larger than unity. The dispersion curves of the wave for h\ eweq0 show that the occurrence of instabilities may be expected at both sides near the cyclotron frequency and the higher harmonics. The conditions for onset of the collision-induced instability at the cyclotron frequency and the second harmonic are given by h>3 and h>5 respectively in the long wavelength limit. When the wave number and the electron density are chosen suitably, the conditions are modified as h>2.6 and h>3.7.
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  • Parametric Coupling of Langmuir Waves in an Inhomogeneous Plasma
    Tsutomu Ikemura, Kyoji Nishikawa
    1972 Volume 32 Issue 5 Pages 1368-1376
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1368
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    Parametric coupling of two Langmuir waves due to a combined action of a small density gradient and an externally applied, spatially homogeneous, high-frequency electric field is investigated. It is shown that the space-dependence of the pump field plays a decisive role in the parametric coupling, the space-dependence being produced due to the oscillation of the electrons relative to the ions by the external field. On the basis of a fluid description of the plasma, a coupled system of partial differential equations, which describe the relevant parametric coupling, are derived to the lowest significant order with respect to the pump field. For the case the perturbed velocity varies as exp[i∫xk(x′)dx′], a nonlinear dispersion relation is obtained, with the use of which various characteristics of the parametric coupling, such as the frequency shift, frequency locking and instability, are investigated.
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  • Two-Dimensional Wave Motion near the Magnetic Neutral Line
    Masatoshi Tanaka
    1972 Volume 32 Issue 5 Pages 1377-1379
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1377
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    The motion of a compressible, perfectly conducting fluid in the neighbourhood of the magnetic neutral line of arbitrary order is examined. The equation describing the perturbation of magnetic field can be reduced to a wave equation with constant coefficients when the Alfven speed exceeds the sound speed in the fluid. Temporal development of the perturbation is calculated together with the motion of he fluid.
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  • Electron Energy Transfer Processes in a Weakly Ionized Nonequilibrium Flow
    Hiroki Honma
    1972 Volume 32 Issue 5 Pages 1380-1384
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1380
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    For a weakly ionized nonequilibrium plasma flowing out from a positive column of a gas discharge through a cylindrical tube, the axial decay rate of the electron temperature is obtained in an analytical formula from an approximate solution for an energy equation for electrons. For the case when the electron energy is mainly supplied from the upper stream by thermal conduction and lost by ambipolar diffusion toward the wall, the decay rates measured for an ionized argon flow are found to be in qualitative agreement with the rates evaluated from the formula. This agreement suggests that the energy loss toward the wall is reasonably evaluated by the present analysis, and assures such an analytical result that the decay rates of the electron temperature depend on those of the electron number density due to the proportionality of the electron thermal conductivity for weakly ionized gases to the electron number density.
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  • Stability of Reverse Field Diffuse Pinch
    Tsuneo Amano, Tadamoto Tamai, Masahiro Wakatani
    1972 Volume 32 Issue 5 Pages 1385-1393
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1385
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    The stability of reverse field diffuse pinch against the hydromagnetic and resistive instabilities is investigated. By means of Newcomb’s criterion, the hydromagnetic stability is tested for a number of model field configurations which are obtained by a modification of the force free fields. Stability diagrams showing the position of the conducting wall for stability are computed by changing the shape of the axial current distribution, the average beta and the degree of the field reversal. The growth rates of the hydromagnetic instability for some unstable configurations are also computed. The stability against the tearing and the resistive slow interchange modes are examined following the method due to Coppi, Green and Johnson. It is shown that the reverse field configuration is vulnerable to the tearing instability when the pressure profile is nearly uniform in the central region of the plasma.
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  • Thermal Convective Instability of Fluid Heated Suddenly at the Lower Boundary
    Ryuji Takaki, Akira Yoshizawa
    1972 Volume 32 Issue 5 Pages 1394-1397
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1394
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    A linearized theory of stability is applied to the problem of the onset of thermal convection in a semi-infinite fluid of constant temperature whose horizontal lower boundary is heated suddenly and thereafter kept at a higher constant temperature. On basis of the assumption that the basic temperature profile is quasi-stationary, a neutral stability curve is obtained and the critical Rayleigh number is found to be 1340. Amplified disturbance whose growth rate is equal to that of the thickness of the heated layer is also investigated. Results are compared with other theoretical and experimental results.
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  • Slow Settling of Two Droplets Symmetrically Placed about the Axis of a Circular Cylinder in a Direction Perpendicular to Their Line of Centers
    T. Greenstein
    1972 Volume 32 Issue 5 Pages 1398-1402
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1398
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    Expressions are provided which enable the frictional force on the reference spherical droplet to be computed for the particular case when two spherical droplets move in a direction perpendicular to their line of centers symmetrically placed about the axis of a circular cylinder. Results for this motion are also expressed in terms of the ratio of frictional forces experienced by 1) a droplet of arbitrary shape in a bounded fluid with another droplet and 2) the droplet now moving alone with the same speed and orientation in the same but unbounded fluid.
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  • The Exact N-Soliton Solution of the Korteweg-de Vries Equation
    Miki Wadati, Morikazu Toda
    1972 Volume 32 Issue 5 Pages 1403-1411
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1403
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    The exact N-soliton solution of the Korteweg-de Vries equation is obtained through the procedure suggested by Gardner, Greene, Kruskal and Miura. From this solution, it is shown that solutions are stable and behave like particles. The collisions are well described by the phase shifts. Explicit calculation of the phase shifts assures the conservation of the total phase shift. This fact turns out to be a special expression for the constant motion of he center of mass.
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  • Pure Quadrupole Resonance of Alkali Nuclei in Some Bromates by Double Resonance Method
    Jumpei Okada, Ryoichi Kado
    1972 Volume 32 Issue 5 Pages 1412-1414
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1412
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    Weak pure quadrupole resonances of Na23, K39, Rb85 and Rb87 in NaBrO3, KBrO3 and RbBrO3 were detected by nuclear double resonance method at room and liquid nitrogen temperature.
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  • Diffusion of Oxygen Vacancies in Reduced Rutile (TiO2)
    Eisuke Iguchi, Kazuo Yajima
    1972 Volume 32 Issue 5 Pages 1415-1421
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1415
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    Diffusion coefficients of point defects in reduced rutile (TiO2) due to the reduction in vacuum of 4×10−9 Torr with the ion pump in the temperature range 800°C–1100°C were studied.
    The coefficients along c and a-axes are
    (Remark: Graphics omitted.)
    The activation energies are very close to tat of O18 in rutile by Haul and Dümbgen.
    Diffusions are discussed in terms of oxygen vacancies from the crystal orientation dependence of the coefficients and the activation energies. It is concluded that the result in this experiment gives the clear evidence of the presence of oxygen vacancies in reduced rutile and their migration energies are 2.4 eV.
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  • The Levels of 93Zr Populated in the Decay of 93Y
    Susumu Ohya, Zyun-itiro Matumoto
    1972 Volume 32 Issue 5 Pages 1422-1429
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1422
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    The decay of 93Y to the levels in 93Zr has been investigated with the use of Ge(Li), Si(Li), NaI, plastic and anthracene detectors in singles and coincidence experiments. Gamma-ray energies and relative intensities were carefully determined. The resulting decay scheme consists of levels at 267.0, 946.1, 1425.5, 1449.8, 1469.5, 1650.4, 1827.1, 1908.8, 2183.7, 2457.7 and 2474.7 keV. Gamma-gamma directional correlation measurement has been performed for the 679.1–267.0 keV cascade; A2=−0.0049±0.0213 and A4=0.020±0.036. The K conversion coefficient was determined for the 267.0 keV transition; αk=0.022±0.004. The spin-parity of the 267.0 keV level has been determined to be 3/2+. The proposed level scheme was dompared with the prediction of current theoretical calculations.
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  • Structural Anomalies Observed in Spherical Single Crystals of α Cu-16 at. % Al Alloy
    Yasuyuki Kitano, Yukitomo Komura
    1972 Volume 32 Issue 5 Pages 1430
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1430
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  • Magnetic Properties of A New Ferromagnetic Compound MnGaGe
    Kenzo Shibata, Takeshi Shinohara, Hiroshi Watanabe
    1972 Volume 32 Issue 5 Pages 1431
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1431
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  • Crystallographic and Magnetic Studies of Rare Earth Chalcogenide Spinels
    Hironobu Fujii, Tetsuhiko Okamoto, Takahiko Kamigaichi
    1972 Volume 32 Issue 5 Pages 1432
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1432
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  • Decay Mechanism of Bound Exciton in AgCl:I− for Band-to-Band Excitation
    Motowo Tsukakoshi
    1972 Volume 32 Issue 5 Pages 1433
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1433
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  • Temperature Dependence of the Mn2+ Concentration in Sintered Mixed Compounds Cd1−xZnxS and CdS1−xSex
    Masasi Inoue, Chao-Yuan Huang
    1972 Volume 32 Issue 5 Pages 1434
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1434
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  • Activation Energy of Radiation-Induced Defects in CdS
    Michiharu Kitagawa, Toshio Yoshida
    1972 Volume 32 Issue 5 Pages 1435
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1435
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  • ac Photoconductive Study of the FA(Li) Centers in RbCl
    Hiroshi Ohkura, Masafumi Ototake
    1972 Volume 32 Issue 5 Pages 1436
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1436
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  • Study of the Critical Behavior of TGS by Thermal Noise Measurements
    Yasunori Tominaga, Shuich Iida
    1972 Volume 32 Issue 5 Pages 1437
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1437
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  • Lattice Vibrations in MgTe-CdTe Mixed Crystals
    Shin-ichi Nakashima, Takaaki Fukumoto, Akiyoshi Mitsuishi, Kohji Itoh
    1972 Volume 32 Issue 5 Pages 1438
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1438
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  • Lifetime Spectra of Positrons in Transition-Metal Monoxides
    Masayasu Noguchi, Masanobu Saeki, Masaru Shioda, Kenji Shibata, Toshin ...
    1972 Volume 32 Issue 5 Pages 1439
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1439
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  • The Extreme Ultraviolet Absorption Spectra of CuCl and CuBr
    Takehiko Ishii, Shigeru Sato, Tokuo Matsukawa, Yasuo Sakisaka, Takasi ...
    1972 Volume 32 Issue 5 Pages 1440
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1440
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  • Anisotropic Diffuse X-ray Scattering and Phase Transitions in NaNbO3
    Koichi Ishida, Goro Honjo
    1972 Volume 32 Issue 5 Pages 1441
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1441
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  • Dielectric Dispersion and Phase Transition of KOH Doped Ice
    Shuji Kawada
    1972 Volume 32 Issue 5 Pages 1442
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1442
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  • Growth of CoCr2S4 and FeCr2S4 Single Crystals by Chemical Vapor Transport
    Tsuneo Watanabe
    1972 Volume 32 Issue 5 Pages 1443
    Published: May 05, 1972
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1443
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  • Nuclear Relaxation in NQR of Hydrazine
    Yoshihito Abe, Noriaki Okubo, Shoji Kojima
    1972 Volume 32 Issue 5 Pages 1444
    Published: May 05, 1972
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.32.1444
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