All issues
Volume 48 (1980)
- Issue 6 Pages 1797-
- Issue 5 Pages 1407-
- Issue 4 Pages 1055-
- Issue 3 Pages 711-
- Issue 2 Pages 351-
- Issue 1 Pages 1-
Predecessor
- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
- Proceedings of the Tokyo Mathematico-Physical Society. 2nd Series
- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
- Tokyo Sugaku-Butsurigakkwai Hokoku
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku Kaisya Zasshi
Volume 48, Issue 4
Displaying 1-50 of 60 articles from this issue
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V. Kumar, A. P. Sharma1980 Volume 48 Issue 4 Pages 1055-1061
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe results of momentum and longitudinal rapidity of multiparticles in 50 GeV/c π−-Em Collision have been obtained from the emulsion stack exposed under the pulsed magnetic field. The normalized single particle rapidity distribution REm(Y) has been compared with the predictions of energy flux cascade model, two phase model, hydrodynamical model, eikonal model and the additive quark model. The additive quark model explains the data and particularly the ‘leading particle attenuation-effect’ very satisfactorily. With the help of AQM, a nuclear-scaling between the normalized mean multiplicity of created particles and the effective mean number of collisions ⟨νA⟩ has been proposed.View full abstractDownload PDF (740K) -
I. Dhar, G. Ojha, R. Bhanja, M. Shyam, S. K. Tuli1980 Volume 48 Issue 4 Pages 1062-1069
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSome characteristics of gamma production have been studied in nuclear emulsions subjected to a magnetic field of strength 180 KG during exposure to a π− beam of momentum 50 GeV/c. The gammas are selected from a very narrow forward cone (θL≤10°) in the laboratory system. The energy of the gamma rays are measured. by using magnetic bending property of tracks and also by the usual coordinate methods. The average energy carried off by gammas and the average values of the longitudinal and transverse components and their moments have been estimated. The gamma momentum spectrum has also been studied in the ππ and πN CM systems. The experimental results are fairly well explained in terms of isobar productions as well as diffraction dissociation processes.View full abstractDownload PDF (872K) -
Susumu Ohya, Kenji Katsumata, Kenichi Miyazawa, Naoshi Mutsuro, Akira ...1980 Volume 48 Issue 4 Pages 1070-1074
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe E0 transitions from the first 01+ state to the ground state of 112Cd and 106Pd have been found from the internal conversion electron study of the decay of 112In and 106Rh with Si(Li) detectors. The strong β+-rays from the decay of 112In were suppressed by a mini-orange magnetic filter. Also, an X-ray-e− coincidence system was employed for the β−-decay of 106Rh. The values of X(E0/E2)=B(E0, 01+→0g+)/B(E2, 01+→21+) are obtained; X(E0/E2)=0.033±0.004 for 112Cd and 0.0181±0.0014 for 106Pd. The values are compared with the prediction of current theoretical calculations.View full abstractDownload PDF (520K) -
Shozo Takeno1980 Volume 48 Issue 4 Pages 1075-1083
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNonlinear excitations in the Ising model in a transverse field or an equivalent Frenkel-exciton model for a system of two-level atoms are studied by using a method of diagonal coherent-state representation. It is shown that if the ratio of the Ising interaction to a transverse-field strength exceeds a certain critical value, stationary coherent states giving the ground state and excited states of the model Hamiltonian are characterized by two degenerate structures resulting from spatially uniform coherent states and static domain-wall type excitations, respectively. Particular solutions for the time evolution of spin operators corresponding to atomic polarization are then studied. It is shown that moving domain-wall solutions or moving solitary-wave solutions can exist under certain conditions.View full abstractDownload PDF (960K) -
Ikuo Ono1980 Volume 48 Issue 4 Pages 1084-1091
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe “ROP” phase transition of a triangular cactus tree composed of Ising spins with bond-diluted antiferromagnetic interaction is considered. In the restricted region of the concentration of antiferromagnetic bonds between 0.771 and 0.478 an ordered phase which is associated with the spin orientation of the ground state is shown to be allowed. The temperature dependence of the order parameter, spin-pair-correlation and energy are also estimated. The specific heat exhibits a smaller but more sharp peak than that in a dilute ferromagnet at the transition temperature Tc. The susceptibility has a weak cusp at Tc. The present results are compared with the Monte Carlo simulations on a planer triangular lattice.View full abstractDownload PDF (808K) -
Yoshimitsu Tanaka, Takashi Tsuchida, Yoji Nakamura1980 Volume 48 Issue 4 Pages 1092-1096
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to understand the magnetic behavior of Co atoms in Gd(Co1−xNix)2 compounds, the 59Co nuclear magnetic resonance and the thermal expansion have been measured. The analysis of NMR spectra at 4.2 K, based on a nearest neighbor configuration model, leads to a concentration independent Co moment or about 1 μB. This result is supported by the concentration dependence of the spontaneous volume magnetostriction derived from thermal expansion measurements.View full abstractDownload PDF (564K) -
Yoshikazu Ishikawa, Keisuke Tajima, Yasuhisa Noda, Nobuyoshi Wakabayas ...1980 Volume 48 Issue 4 Pages 1097-1104
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic excitations in an ordered ferromagnetic alloy of Fe78Pt22 have been studied by neutron scattering. Magnetic dispersion relations have been measured in the [001], [110] and [111] directions. The dispersion curve attained to the zone boundary in [001], while in other two directions, well defined magnon groups could be detected up to 80 meV. The dispersions still have steep slopes, suggesting that magnon energies at zone boundaries would be quite high. The results have been analyzed in terms of the spin wave theory of the four sublattice Heisenberg system, which indicates that any solutions for fitting the observed dispersions could not explain consistently the whole experimental data. An anomalous damping of the magnons in the [001] direction was detected at high temperatures.View full abstractDownload PDF (980K) -
Ikuo Nakai, Fumihisa Ono, Osamu Yamada1980 Volume 48 Issue 4 Pages 1105-1110
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe magnetization of a single crystal of the 35.4 at% Ni–Fe Invar alloy has been investigated between 4.2 K and 280 K in external fields up to 16.9 kOe to an accuracy of about 5 parts in 105. The spin-wave stiffness constant including its temperature variation and the higher-order term than the T3⁄2 term due to the spin-wave excitations are determined from only the data of magnetization measurements. The observed decrease in magnetization excluding the spin-wave term depends on T2 and seems to be associated with the Stoner-type excitations. The contribution of T2 term is found to be as large as the spin-wave contribution.View full abstractDownload PDF (704K) -
Kiiti Siratori, Jun Akimitsu, Eiji Kita, Masakazu Nishi1980 Volume 48 Issue 4 Pages 1111-1114
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSConsidering the magnetic symmetry of a screw spin structure, it was shown that the sense of the screw spin structure can be controlled by a magnetoelectric cooling. It was confirmed experimentally in ZnCr2Se4 by means of a polarized neutron diffraction.View full abstractDownload PDF (436K) -
Kazuyoshi Takeda, Tomoyuki Koike, Takashi Tonegawa, Isao Harada1980 Volume 48 Issue 4 Pages 1115-1122
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic phase diagrams of the most typical quasi-one-dimensional antiferromagnet (CH3)4NMnCl3 (TN=0.835 K) reported in our previous paper have been investigated in more detail by heat capacity and magnetic susceptibility measurements in external magnetic fields up to 30 kOe. The phase diagrams for the external field applied along the in-plane easy and hard axes normal to the magnetic chain are reproduced satisfactorily by the theory in which the classical anisotropic XY model is assumed for the magnetic chain and interchain interactions are treated within the molecular field approximation. The magnitude of the anisotropy field in the plane normal to the chain is determined to be 93 Oe.View full abstractDownload PDF (1084K) -
Nozomu Inoue, Ken-ichi Kumagai, Tadashi Sugawara1980 Volume 48 Issue 4 Pages 1123-1129
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNMR measurements on 51V and 93Nb impurities in Pt and Pd host metals were carried out using both CW and pulsed NMR techniques. Line width, Knight shift and nuclear magnetic relaxation time were measured at temperatures between 4.2 and 1.2 K. Marked result is strong reduction of nuclear spin-lattice relaxation rate of impurity nuclei compared with that in bulk V or Nb metals. From the observed results on the Knight shift and the spin-lattice relaxation rate, it is concluded that the local density of states at the impurity sites are severely reduced compared with that in bulk. Comparison with the theoretical calculations is briefly given.View full abstractDownload PDF (908K) -
Hiroki Itoh1980 Volume 48 Issue 4 Pages 1130-1136
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetization, susceptibility and resistivity measurements were made on the system Cu(Rh1−xCrx)2S4. The resistivities (ρ) of the Cr substituted samples show an increase below room temperature. Δρ (solute resistivity) vs temperature curve for x=0.10 seems to show Kondo anomaly. The samples (x=0.30, 0.40) show ferromagnetism (TC=39 K, 166 K). The susceptibilities (χ) of x=0.10 and 0.20 show an anomaly at about 200∼230 K and increase markedly at lower temperatures. χ vs T curve for x=0.10 was analyzed by assuming θp=0 and the magnetic moment to be temperature-dependent. A unified picture of the properties of the three spinel systems Cu(Rh1−xCrx)2S4 (Se4) and Ni(Rh1−xCrx)2S4 is presented.View full abstractDownload PDF (804K) -
Kazuo Ueda, Yukito Tanabe1980 Volume 48 Issue 4 Pages 1137-1146
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe motion of an exciton in antiferromagnets is investigated by using the magnon approximation. It is shown that nature of the motion varies with the ratio of Γ0+ZΓ1 to the exciton band width K(0), where Γ0 represents the fluctuation of the exciton energy, Γ1 the transition probability between the nearest neighbor intersublattice pair and Z the coordination number. It is found that Γ0 and Γ1 increase as T3. At low temperatures, where Γ0+ZΓ1<<K(0), exciton moves coherently on one sublattice and at high temperatures where Γ0+ZΓ1>>K(0), it moves diffusively on both sublattices.View full abstractDownload PDF (1060K) -
Shinji Kobayashi, Koji Maeda, Shin Takeuchi1980 Volume 48 Issue 4 Pages 1147-1152
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA model amorphous structure has been constructed in computer for a metal-metal amorphous alloy CU57Zr43 through random positioning of the two species of atoms followed by relaxation using modified Lennard-Jones 4–8 potentials. The results agree well with experimental ones in the partial radial distribution functions and in the density. Voronoi polyhedra analysis was performed in order to examine geometrical characteristics of the constructed model.View full abstractDownload PDF (740K) -
Jun Imazato, Yasutomo J. Uemura, Nobuhiko Nishida, Ryugo S. Hayano, Ka ...1980 Volume 48 Issue 4 Pages 1153-1156
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Knight shift of positive muons in metallic Pd has been measured at room temperature by muon spin rotation method. The observed value is −223±80 ppm, and the result is discussed in terms of conduction electron spin polarization in transition metals.View full abstractDownload PDF (500K) -
Shoichi Mase, Takeshi Fukami, Masatoshi Mori, Masahiro Akinaga, Toshin ...1980 Volume 48 Issue 4 Pages 1157-1165
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA reinvestigation has been made of an anomaly in the temperature dependence of the ultrasonic attenuation in bismuth, which is observed when an electron Landau level and a hole Landau level approach simultaneously to the Fermi level at high magnetic fields and at low temperatures. It has been found that in the most anomalous case the anomaly in the temperature dependence accompanies an anomalous frequency dependence and these are quite sensitive to physical imperfections in bismuth. On the basis if Kuramoto’s theory of sound attenuation which is taking account of the short-range electron-hole correlation, the experimental results are analyzed, and it is suggested that one more additional term is required to explain the present anomalous data.View full abstractDownload PDF (1108K) -
Shoichi Mase, Masatoshi Mori, Takeshi Fukami, Masahiro Akinaga, Toshin ...1980 Volume 48 Issue 4 Pages 1166-1169
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn the course of studying and angular dependence of the ultrasonic attenuation in bismuth at high magnetic fields and low temperatures, some extra attenuation peaks were observed in a limited range of magnetic field directions. These are not assigned to any known Landau levels, and interpreted as due to the existence of a slight warping of the electron Fermi surface. It is suggested that this warping is one cause of the anomaly in the temperature dependence described in the preceding paper.View full abstractDownload PDF (464K) -
Etsuo Matsuo, Mikio Tsuji1980 Volume 48 Issue 4 Pages 1170-1175
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dispersion relations of the ordinary high-frequency (or cyclotron) waves are investigated for metals and semiconductors in external magnetic fields of Voigt configuration. By assuming the collisionless free electron model, the ‘real lines’ i.e., the complex wave vectors (q) which give real frequency are calculated numerically. Special cases of small and large |q| are considered in detail.View full abstractDownload PDF (760K) -
Yoshihiro Ohmura, Koji Ishikawa1980 Volume 48 Issue 4 Pages 1176-1183
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTheoretical study of Doniach and Sunjic (DS) on X-ray photoemission spectra (XPS) is extended beyond the behaviour precisely at threshold. A perturbational calculation where the static hole potential is present only after photoemission is performed to the fourth-order term based on Mizuno and Ishikawa’s model. The anomalous exponent α in DS theory is found to have a correction term which is linear in ωF−ω. Here, hω is the energy of an emitted electron and hωF the threshold energy. This correction term is appreciably large at finite distances from threshold. Exponents experimentally obtained away from threshold are different by nature from those given by DS theory.View full abstractDownload PDF (948K) -
Jun’ichiro Nakahara, Atsuhiro Fujii1980 Volume 48 Issue 4 Pages 1184-1192
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAbsorption and reflection spectra due to direct interband transitions are measured in TlBr in magnetic fields up to 15 tesla using a highly sensitive detection technique. Both the upper and lower branches appearing in the resonant polaron coupling are calculated by a Brillouin-Wigner perturbation method. Using this result, the pinning observed in the interband transition is discussed.View full abstractDownload PDF (1104K) -
Tokiko Ohata, Tetsusuke Hayashi, Shigeharu Koshino1980 Volume 48 Issue 4 Pages 1193-1195
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe azimuthal dependence of the polarization of luminescence due to (Tl+)2 centers in KI has been measured and compared with that expected from the symmetry of centers. It is found that the orientation of the Tl+–Tl+ axis is parallel to a ⟨110⟩ axis of a crystal.View full abstractDownload PDF (376K) -
Minoru Fukui, Shunichi Chikushi, Ryuji Abe1980 Volume 48 Issue 4 Pages 1196-1201
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSESR and ENDOR measurements for Mn2+ ions doped in the ferroelectric BaMgF4 crystal were made. The Mn2+ ions are substitutional for the Mg2+ ions in the distorted MgF6 octahedra. The temperature dependence of crystal field tensor indicates that one MgF6 octahedron rotates clockwise about the c-axis and another adjacent octahedron rotates counterclockwise as the temperature decreases from the hypothetical Curie temperature. It suggests that two sites become equivalent in the hypothetical phase and the phase has Amam symmetry. The critical exponent value for the rotation angle of the crystal field tensor is 0.5. The normal modes of the lattice vibration in the hypothetical phase were analyzed and the structure in the ferroelectric phase was discussed in connection with the frozen B1u modes in the hypothetical phase.View full abstractDownload PDF (772K) -
Michio Midorikawa, Akikatsu Sawada, Yoshihiro Ishibashi1980 Volume 48 Issue 4 Pages 1202-1205
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRaman scattering investigation was carried out for RbCaCl3 crystal over the temperature range including two phase transitions. No well-defined softmodes were observed either at the cubic-tetragortal transition T1=300°C or at the tetragonal-orthorhombic transition T2=230°C.View full abstractDownload PDF (424K) -
Kazuo Gesi1980 Volume 48 Issue 4 Pages 1206-1208
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric constants of AgNO2 were measured along the three crystallographic axes below room temperature. The dielectric constant along the a-axis increases monotonically with decreasing temperature, while that along the b-axis decreases monotonically. The dielectric constant along the c-axis first decreases with decreasing temperature, then turns to increases at about 17.5 K. No anomaly was found at around 40 K where a phase transition was suggested by Makishima et al. (Bull. Am. Phys. Soc. 10 (1965) 681).View full abstractDownload PDF (388K) -
Masanori Hangyo, Riso Kato1980 Volume 48 Issue 4 Pages 1209-1218
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of the Raman spectrum of AgNa(NO2)2 has been studied. At low temperatures, the ν2-spectrum due to the bending vibration of the NO2− ions in the crystal consists of two components at 832 and 858 cm−1. With increasing temperature, the third component becomes appreciable at 845 cm−1 near −40°C. The third and 858 cm−1 components approach each other as temperature rises and merge together resulting in a broad band above Tc. Near 0°C, a weak shoulder becomes appreciable on the high energy tail of 832 cm−1 component. The shoulder and 832 cm−1 component also merge together and become a broad band above Tc. The sum of their intensities decreases monotonically as temperature rises and drops remarkably near Tc. Assignments are given to the four components of the ν2-spectrum by referring to the IR and luminescence spectra of the crystal. The results are also discussed in relation to the phase transition in the crystal.View full abstractDownload PDF (1220K) -
A. K. Ghosh, S. N. Sen1980 Volume 48 Issue 4 Pages 1219-1225
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMolecular relaxation time in case of Methanol and Ethanol dissolved in benzene has been obtained by measuring the radio frequency conductivity of the solution at different concentrations utilizing Murphy and Morgan equation and also at different frequencies of the measuring field utilizing the expression deduced by Sen and Ghosh which assumes the presence of free ions. It is observed that τ value for both the alcohols obtained from frequency variation method is slightly lower than that obtained by the concentration variation method which suggests that actual dielectric loss is less due to finite conductivity of the solution due to the presence of the free ions whose concentration has also been obtained in both the alcohols.View full abstractDownload PDF (780K) -
Syuso Fujii1980 Volume 48 Issue 4 Pages 1226-1232
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have calculated the spin relaxation time of positive muon diffusing by means of tunneling processes among self-trapped states. It is shown that, because of the nearly antiferromagnetic structure, Chromium is very advantageous compared with the case of ferromagnetic Iron to study not only intrinsic diffusion properties but also effect of defect on the muon motion. Temperature dependence of the relaxation time observed by Kossler et al. is well understood in terms of the narrowing by the under-barrier hopping and the coherent motion. This comparison indicates that muon diffusion parameters are similar in Chromium and Iron.View full abstractDownload PDF (924K) -
Kin-ichi Masuda, Yukiyasu Sugano, Akikazu Sato1980 Volume 48 Issue 4 Pages 1233-1236
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA tight-binding type electronic theory is used to calculate the interaction energy between a self-interstitial and a (1/2)⟨111⟩ screw dislocation in bcc transition metals (α–Fe, W and Nb). The repulsive core-core interaction energies are simulated by a Born-Mayer type potential as well as a simple power law potential. It is shown that the maximum interstitial-screw dislocation binding energy is comparable to the double-kink nucleation energy and can account for the irradiation softening of bcc transition metals.View full abstractDownload PDF (400K) -
Yukichi Taji1980 Volume 48 Issue 4 Pages 1237-1244
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe formation of a vacancy in the diamond structural crystal is studied by a computer simulation as a many body problem of classical particles interacting with the noncentral force of the Keating strain energy potential. The simulation starts with making a vacant site in the perfect crystal. The relaxation of atoms around the vacant site is resisted by the restoring force of bond-bendings towards the equilibrium angle to be balanced stationarily by forming a stable vacancy. Without taking into account this noncentral force interaction, the formation of a vacancy is impossible. The formation and migration energies of a vacancy and the formation energy of a divacancy in Si and Ge are obtained from the computer simulations.View full abstractDownload PDF (948K) -
Seiya Abiko1980 Volume 48 Issue 4 Pages 1245-1253
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA model of the resonant Raman scattering (RRS) is constructed, in which optically created exciton is resonantly decomposed into an electron in the continuum and a localised hole. This RRS via virtual exciton results in the so called double resonance and enhancemernt of q\simeq0 LO phonon scattering in an appropriate condition. If the p–s exciton in this model is replaced by the 4f–5d exciton, this model presents one of the possible mechanisms which explain the sharp RRS of q\simeq0 LO phonon observed in rare-earth chalcogenides in spite of its forbidden symmetry.View full abstractDownload PDF (1024K) -
Nobuo Ueno, Toshiki Fukushima, Kazuyuki Sugita, Setsuo Kiyono, Kazuhik ...1980 Volume 48 Issue 4 Pages 1254-1260
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSecondary electron emission (SEE) measurernent was used to investigate the conduction band structures of n-C28H58, n-C36H74, n-C44H90 and polyethylene, and ultraviolet photoelectron spectra of n-C28H58 and n-C36H74 were measured. Several structures, whose kinetic energy positions were independent of the energies of incident sources, were observed in the both spectra. It was found that SEE spectra of all compounds were almost similar with each other, and corresponded well with the photoelectron spectra. These structures are ascribed to the high density-of-states parts of the conduction band which do not depend on the chain length. The spectra were compared with the energy distribution curve of secondary electrons estimated by the use of XPS result for the valence band and theoretical result for the conduction band of isolated chain. The energy positions of the structures of the estimated curve agree fairly well with those of observed spectrum.View full abstractDownload PDF (828K) -
Teruhiko Hoshina1980 Volume 48 Issue 4 Pages 1261-1268
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFormulation of radiative transition probabilities of 5d1→4f1 of Ce3+ and of 4f65d→4f7 of Eu2+ in a cubic crystal field is performed using pure 5d and 4f wavefunctions. The emitting state of Ce3+ is 5d(T2) or 5d(E). The coupled states of the 4f6(7F) core and 5d(t2 or e) are taken as the emitting states of Eu2+. Line strengths are calculated for all possible transitions, and transition probability distributions over the terminal states are obtained. The estimated radiative lifetimes of Ce3+ are about a half of the observed ones. For Eu2+, the calculated lifetimes are about thirty times as long as the observed ones. The theory suggests that Ce3+ has the largest radiative transition probability in the rare-earth ions exhibiting 5d-4f luminescence.View full abstractDownload PDF (816K) -
Yumi Ousaka, Osamu Sakai, Masashi Tachiki1980 Volume 48 Issue 4 Pages 1269-1278
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spin assisted phonon Raman scattering in EuS, EuSe and EuTe is Studied, based on the Raman Polarizability whose spin-phonon dependence originates from the cross effect of the 4f spin-orbit interaction and the exciton-phonon interction. The phonon dispersions are calculated on the basis of the breathing shell model. The scattering spectrum consists of two parts: One part is a broad line assisted by the spin fluctuations. Most contribution for it comes from LO-phonon, but in EuTe TO-, LA- and TA-phonon contributions also become considerably large. The other part is the sharp line induced by the staggered magnetization. The result of calculation explains the observed results, such as the line shape, and its temperature and magnetic field dependence.View full abstractDownload PDF (1200K) -
Yukio Noda, Toshio Ishii, Masahiro Mori, Yasusada Yamada1980 Volume 48 Issue 4 Pages 1279-1287
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn X-ray study of successive phase transitions on K2SeBr2 has been performed and the results were interpreted on the stand point of the condensation of the rotary modes of SeBr6 octahedra. The rotary modes belong to the irreducible representations: X4+ ([001] zone boundary mode) and Γ4+ (zone center mode) of space group Fm3m. It has been shown that the symmetry of the crystal transforms sequentially with decreasing temperature as Fm3m→P4⁄mnc→C2⁄n→P21⁄n. This sequential transition scheme is explained by postulating the successive condensations of the rotary modes at the transition points in the sequence of Xz4+→Γy4+→Γx4+.View full abstractDownload PDF (1080K) -
Masahiro Mori, Yukio Noda, Yasusada Yamada1980 Volume 48 Issue 4 Pages 1288-1297
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSX-ray and neutron scatterings at the incommensurate Jahn-Teller phase transitions in R2PbCu(NO2)6 (R: K, Rb, Cs, Tl) are studied in order to investigate microscopic origins to stabilize these incommensurate phases. We discuss the characteristics of diffuse scattering which do not allow the conventional interpretation as critical scattering associated with correlations of an order parameter. It has been shown that major component of the diffuse scattering is well explained as ‘Huang scattering’ due to tetragonal ‘defects.’ In the disordered phase, each Cu(NO2)6-group is already locally distorted, with the axis of tetragonal elongation taking one of the cubic principal axes at random (either spatially or temporally) and this local distortion is ‘dressed’ by a strain field. Such a view point establishes a possible origin of long range interaction to stabilize the incommensurate phases.View full abstractDownload PDF (1288K) -
Katsuyuki Asaumi, Seiji Kojima, Terutaro Nakamura1980 Volume 48 Issue 4 Pages 1298-1306
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effects of the hydrostatic pressure on the ferroelastic NdP5O14 were investigated both by crystal-optic methods and the single crystal X-ray diffraction technique, using three types of diamond anvil cells. The monoclinic to orthorhombic phase transition temperature Tc was found to increase with increasing pressure with the initial slope of dTc⁄dP∼38 K/kb. A marked increase of monoclinic distortion angle δ and the associated increase of the half angle of the extinction positions between the two neighboring ferroelastic domains θ were observed with the increase of applied hydrostatic pressure. Pressure effects on the above measured quantities are discussed.View full abstractDownload PDF (1660K) -
Shunichi Kawanishi, Tsuneo Sasuga, Masaaki Takehisa1980 Volume 48 Issue 4 Pages 1307-1310
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA temperature dependence of the spin-lattice relaxation time T1 of acrylonitrile was studied by using a pulse NMR to elucidate a presence of liquid-liquid transition. In the T1-temperature diagram, T1 changed discontinuously at −26°C. This indicated that liquid-liquid transition of acrylonitrile exists at −26°C at atmospheric pressure. Molecular motions which contribute to the relaxation mechanism can be separated into two parts, rotational and translational motion. A degree of discontinuity in T1 from the rotational motion was larger than that from the translational motion. The rotational motion of acrylonitrile plays an important role in the phase transition.View full abstractDownload PDF (488K) -
Shunichi Kawanishi, Tsuneo Sasuga, Masaaki Takehisa1980 Volume 48 Issue 4 Pages 1311-1315
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA spin-lattice relaxation time T1 of α,β,β-Trifluoroacrylonitrile (FAN) was measured in the temperature region of −85 to 0°C. In the T1-temperature diagram, T1 changed discontinuously at −34°C where the liquid-liquid phase transition occurred. Pressure-volume relation had a break point which correspond to the phase transition.
From analysis of relaxation mecchanism, the transition is mainly due to a rotational molecular motion. A temperature dependence of the correlation time was expressed as Arrhenius equation in both phases and activation energies were 7.4×10−2 and 8.7×10−2 eV in the high and low temperature phase, respectively.View full abstractDownload PDF (564K) -
Pak-Kon Choi, Kenshiro Takagi, Katsuo Negishi1980 Volume 48 Issue 4 Pages 1316-1322
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSVibrational relaxation studies of liquid furan-cyclohexane and dichloromethane-cyclohexane mixtures were made with three ultrasonic techniques, high-resolution Bragg reflection, Brillouin scattering and pulse-echo-overlap. The velocity and absorption were measured in the frequency range from 3 MHz to 5 GHz. The relaxation frequencies were obtained as a function of concentration of cyclohexane. The increase in relaxation frequency was found to be caused by the fast process of intermolecular vibrational-vibrational energy transfer. The results were analyzed with the binary collision theory. The rate constants of the energy transfer from the 605 cm−1 mode of furan to the 522 cm−1 mode of cyclohexane, and from the 717 cm−1 mode of dichloromethane to the 522 cm−1 mode of cyclohexane were estimated to be 3×1010 s−1 for both V–V transfers.View full abstractDownload PDF (868K) -
Kenji Harafuji, Norihiko Sasaki, Hiroshige Watanabe, Shigeo Nagao1980 Volume 48 Issue 4 Pages 1323-1332
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe behavior of magnetic line of force in a stellarator-type toroidal device with three dimensional helical magnetic axis (Asperator NP-3) is investigated both numerically and analytically, especially taking into account of the toroidal perturbation. To avoid or decrease the influence of the crucial 2/3 resonance, the absolute value of ellipticity of magnetic surface ε should be over 1/3, or both ε and triangularity Q should be near zero simultaneously. The swing δ employed in the helical windings is revealed to be very effective to the structure of magnetic surface.View full abstractDownload PDF (1032K) -
Kazuya Uehara, Noboru Fujisawa, Takumi Yamamoto, Tsuyoshi Imai, Takash ...1980 Volume 48 Issue 4 Pages 1333-1340
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSome experimental informations have been obtained concerning the particle and heat transport during lower hybrid heating in the JFT-2 tokamak. The cross field particle and heat transport coefficients are determined from plasma parameters in a scrape-off layer, add the particle and heat losses to the limiter and wall are also estimated experimentally. It is shown that the lower hybrid heating does not give serious effects on the plasma confinement, if the effective ion heating is performed successfully in the main plasma.View full abstractDownload PDF (1116K) -
Ikuo Ikeda, Beonguk Cheon, Masanori Ootani, Hideo Akimune, Kenji Watan ...1980 Volume 48 Issue 4 Pages 1341-1348
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMirror-Torus-System-1 (racetrack form) consists of two straight mirrors connected by U-bend with four divertors in order to obtain the equilibrium plasma.The plasma in a U-bend is detouched from the wall for the divertor configuration and concentrates on the magnetic axis. A depolarization current reducing the electric field by the toroidal drift is experimentally measured. The depolarization current flowing along the azimuthal direction is considered to be composed of two kinds of motions of electrons in a field free area in the divertor. One is the non-adiabatic motion and the other is B×∇B drift motion. The measured value in U-bend, 8.7 μA/mm2, for the current flowing along the line of force passing the neutral line agrees with the calculated one based on the single particle model.View full abstractDownload PDF (1092K) -
Takumi Yamamoto, Takeshi Imai, Michiya Shimada, Hiroshi Takeuchi, Kazu ...1980 Volume 48 Issue 4 Pages 1349-1357
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIon heating efficiencies of the central plasma obtained under various experimental conditions indicated that a nonlinear effect played an important role in the ion heating when the high rf power was irradiated to the plasma. Nonlinearly excited electromagnetic modes as well as the parametric decay spectrum of the electrostatic modes, which were also observed simultaneously, sugegested a further excitation of nonresonant quasi-modes decay instability. It wins shown that the ion heating for ω0⁄ω1h(0)\gtrsim1.13 (where ω0 is frequency of irradiated rf field and ω1h(0) is the lower hybrid frequency at the center of the plasma column) were well explained by the theoretical model having the empirical nonlinear heating rates resulting from the excitation of nonresonant quasi-modes in one-dimensional WKB approximation.View full abstractDownload PDF (1156K) -
Isamu Nakata1980 Volume 48 Issue 4 Pages 1358-1360
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWeakly nonlinear magneto-acoustic wave propagating perpendicularly to the magnetic field in a cold collisionless plasma with random inhomogeneous density distribution is investigated and the existence of shock wave is predicted.View full abstractDownload PDF (324K) -
Amitava Chakraborti, Jayasri Ray1980 Volume 48 Issue 4 Pages 1361-1364
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPrevious investigators have studied the unsteady hydrodynamic and magnetohydrodynamic flow of viscous fluid between plates, cylinder etc. Generally these problems are solved assuming pressure gradient, external forces etc., of deterministic nature. Recently attempts are being made to solve mechanical and hydrodynamic problems under stochastic body and surface forces. Here we shall study a similar flow problem between two plates when one of the plates is kept fixed and the other is subjected to pulses of random strength applied at random instants of time parallel to the other plate. We can easily extend this solution to similar flow problems of elastic viscous fluid.View full abstractDownload PDF (268K) -
Akira Nakamura1980 Volume 48 Issue 4 Pages 1365-1370
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSExact one- or two-periodic wave solutions of the coupled bilinear equations are studied.View full abstractDownload PDF (596K) -
Tsutomu Kawata, Jun-ichi Sakai, Nobuyuki Kobayashi1980 Volume 48 Issue 4 Pages 1371-1379
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA mixed nonlinear Schrödinger equation which has a usual cubic nonlinear term and a derivative cubic term is exactly solved by the inverse scattering method under the nonvanishing boundary condition. We obtain the soliton solution which generally pulsates. But it becomes stationary which is algebraic in some special cases. A peculiar structure of spiky modulation is also shown.View full abstractDownload PDF (772K) -
Hiroki Itoh, Kiyosi Motida1980 Volume 48 Issue 4 Pages 1380-1381
Published: April 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (160K) -
H. Brand, A. Schenzle1980 Volume 48 Issue 4 Pages 1382-1384
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (220K) -
Hideoki Kadomatsu, Makoto Isoda, Fimiaki Ishii, Hiroshi Fujiwara1980 Volume 48 Issue 4 Pages 1385-1386
Published: April 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe magnetocrystalline anisotropy constants of (Co1−xMnx)2B (0≤x≤0.45) have been measured in the temperature range from 4.2 K to 300 K by the torque method. At 4.2 K, the anisotropy constant K1 changed the sign from positive to negative at small x, took a maximum value −6.6×106 erg/cc at x=0.1, and the sign changed to positive again at x≥0.3. The sign of K2 was positive at any x and its magnitude was relatively small.View full abstractDownload PDF (248K)