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Kazuhisa Matsuda, Hitoshi Nakamura, Itaru Nonaka, Hiroshi Taketani, Ta ...
1967 Volume 22 Issue 6 Pages
1311-1320
Published: June 05, 1967
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Differential cross sections of the inelastic proton scattering for low lying states of
90Zr and
92Zr were measured. The incident proton energy was about 14.5 MeV. Inelastic groups were analyzed with a precision magnetic analyzer. Attempts of DWBA fits were made. The general trend of experimental results is in agreement with that of the work of Corolado-ORNL group.
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M. Koshiba, T. Nozaki, Y. Totsuka, S. Yamada
1967 Volume 22 Issue 6 Pages
1321-1336
Published: June 05, 1967
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Copious production of φ meson is observed in nuclear interactions of energies from 10
12 eV to 10
13 eV. It is further shown that a new type baryon ℵ is very likely to explain the various features of ultra high energy interactions so far observed.
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Yutaka Toyozawa, Masaharu Inoue, Teturo Inui, Makoto Okazaki, Eiichi H ...
1967 Volume 22 Issue 6 Pages
1337-1349
Published: June 05, 1967
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The problem of coexistence of the local and band aspects in the fundamental absorption spectra (or the impurity-induced infrared absorption of lattice vibrations) is formulated with the use of the Green’s function method. By a suitable decomposition of the hamiltonian of the electron-hole relative motion (or the dynamical matrix for the lattice vibrations), one can derive a line shape expression in which coexist the both aspects, namely, the metastable excitons (or the quasi-local modes) on the one hand and the Van Hove singularities on the other hand. Their interference results in the antiresonance of the quasi-local states and the metamorphism of Van Hove singularities.
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Makoto Okazaki, Masaharu Inoue, Yutaka Toyozawa, Teturo Inui, Eiichi H ...
1967 Volume 22 Issue 6 Pages
1349-1361
Published: June 05, 1967
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Line shapes of the fundamental absorption and the impurity-induced infrared absorption of lattice vibrations are calculated in order to clarify the complementary interplay of the local and band characters. The shift-broadening matrix method is applied to a monatomic simple cubic lattice with nearest neighbor interaction. As one varies the short range electron-hole attractive potential in the electronic case or the mass and the force constant of the impurity in the vibrational case, Van Hove singularities undergo a metamorphism. A variety of shapes appear in the spectra as the result of the interplay of the both characters. A few remarks are made concerning the available experimental data.
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Tetsuzo Morimoto
1967 Volume 22 Issue 6 Pages
1362-1364
Published: June 05, 1967
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In this paper, it is proved that the statistical mechanical phenomena in the ergodic system are always irreversible when the system has no “angle variables”. Firstly it is shown by using the theorems due to Koopman-von Neumann-Hopf that for such a system
H-function is never less than its time average and then it can be concluded that the
H-theorem always holds.
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Shozo Ino, Shiro Ogawa
1967 Volume 22 Issue 6 Pages
1365-1374
Published: June 05, 1967
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Succeeding to previous studies (Ino, 1966; Ogawa
et al., 1966), the orientations and the structures of thin gold films formed in ultrahigh vacuum by evaporation on to NaCl and KCl have been studied at earlier stages of film formation by electron diffraction and electron microscopy, especially by the dark field technique. The present paper describes some results obtained after the previous reports. Some particles which show rhombic shape in the bright field image and various contrasts in the dark field images have newly been observed. In order to explain such contrasts, the “multiply twinned particle model with a nucleus of (001) orientation” is proposed. Abnormal diffraction spots and image contrasts observed from thin gold films have satisfactorily been explained by using this model in some cases and by using the multiply twinned particle models with a nucleus of (111) orientation in other cases.
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R. E. Nettleton
1967 Volume 22 Issue 6 Pages
1375-1387
Published: June 05, 1967
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A model is advanced for sidewise displacement of a 180° domain wall in single crystal barium titanate under field (
Remark: Graphics omitted.)1 kV. Nuclei of reversed polarization formed at the base grow and cover the wall with a population ν
i of steps of size
i. Kinetic equations are written for ∂ν
i⁄∂
t which show how a weak oscillating field component will perturb the ν
i, enhancing susceptibility. Into these kinetic equations are substituted forces ∂
S⁄∂ν
i, with configurational entropy
S calculated from the number of ways of stacking the steps. This substitution puts the rate equations in canonical form, to which Onsager-Casimir reciprocity relations may be applied, yielding free energy terms quadratic in ∂ν
i⁄∂
t. These terms determine wall inertia and possible coupling of wall motion to dielectric relaxation. For steady state wall velocity
v, one free energy term has the form (
Remark: Graphics omitted.), giving an expression for effective mass
mw.
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Hiromitsu Masui, Sumiaki Ibuki
1967 Volume 22 Issue 6 Pages
1387-1390
Published: June 05, 1967
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The Zeeman effect of the absorption lines of Pr
3+ in CaF
2 was investigated photographically using pulsed magnetic field up to 130kOe at 77°K and 4.2°K. Some strong absorption lines were determined to be associated with the transitions from the ground doublet to the singlets in the crystal field of C
3v symmetry and the transitions were found to be of electric dipole origin.
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Atsushi Koma, Shoji Tanaka
1967 Volume 22 Issue 6 Pages
1391-1400
Published: June 05, 1967
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The behaviour of the split peaks in the presence of the pump microwave observed in the electron double resonance for the ionized donor-pairs in silicon is discussed by introducing the interaction between the impurity-pairs. The interaction is the fluctuating electric field on the homopolar pair arising from the hopping of the carriers in the surrounding polar pairs. Numerical calculations of the kinetic equations showed that the intensity of the resonance peaks increases by several orders of magnitude compared with that on the non-interacting pair model, and a good agreement with the experimental results were obtained. From the observed splitting the mean distance between the homopolar pair and the most effective hopping pair was estimated as about twice as large as the mean distance between the impurity-pairs in the sample.
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Shigeru Maekawa, Hiromoto Ue
1967 Volume 22 Issue 6 Pages
1401-1403
Published: June 05, 1967
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The temperature dependence of the paramagnetic susceptibility of phosphorus doped silicon with concentration of 3×10
16 cm
−3∼4×10
18 cm
−3 was investigated between 300°K and 1.5°K using 10 Gc electron spin resonance technique. Paramagnetism at 300°K originates from the conduction electrons. The contribution from the localized electrons becomes larger with lowering temperature. At liquid helium temperatures, a deviation from the 1/
T relation was observed beyond 1×10
18 cm
−3. The result suggests, together with the conductivity measurement of the same sample, the presence of antiparallel spin coupling between localized electrons, which has been assumed for the explanation of the static susceptibility measurements at low temperatures.
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Hideji Yamada, Masao Shimizu
1967 Volume 22 Issue 6 Pages
1404-1417
Published: June 05, 1967
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Dispersion relations of spin waves in ferromagnetic metals with multiple bands are obtained by the method of normal mode within the random phase approximation and a certain approximation for the Coulomb interaction. It is found that spin wave spectra consist of one acoustical branch, some optical branches and other branches due to inter-band transitions. The inter-band transitions have an important effect on the dispersion relation of an acoustical spin wave at larger momentum. The coefficient of the square of momentum in the dispersion relation of the acoustical spin wave is found to be the sum of
DB and
DH which are derived from the intra-atomic Coulomb and inter-atomic exchange interactions, respectively. For nickel, the value of
DB is estimated as about 0.1 eVÅ
2 by using the model of two overlapping bands, and it is concluded that (
Remark: Graphics omitted.).
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Hideaki Ido, Takejiro Kaneko, Kazuo Kamigaki
1967 Volume 22 Issue 6 Pages
1418-1420
Published: June 05, 1967
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The effect of the pressure on the Curie temperature of CrTe and MnSb compounds of the nickel arsenide were studied up to a pressure of 4,000 kg/cm
2. The rate of change of the Curie temperature was −5.5×10
−3°C kg
−1cm
2 for CrTe and (−3.2±0.5)×10
−3°C kg
−1cm
2 for MnSb. From the result of the present experiment, the critical pressure and temperature to realize a first kind transition from a ferromagnetic to a paramagnetic state in CrTe are evaluated to be 41,000 kg/cm
2 and 107°K, respectively.
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Hisanao Ogura, Yasuo Yoshida, Iwao Iwamoto
1967 Volume 22 Issue 6 Pages
1421-1433
Published: June 05, 1967
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This paper deals with a Fabry-Perot resonator formed by parallel circular plate mirrors. The method of formulation consists in setting up a set of simultaneous integral equations which represent continuities of the field and of its normal gradient across the open wall. The integral equations are transformed into a set of inhomogeneous linear equations for the components of the two infinite-dimensional vectors corresponding to the two boundary-value functions. For a simple excitation that the driving source is uniformly distributed on a small circular area at the center of the mirror, the equations are solved by a successive-approximation method using an electronic computor. The amplitude and the phase distributions of the field are obtained for some driving frequencies and Fresnel numbers. The input characteristic which shows a series of resonance is also given.
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Hisanao Ogura, Yasuo Yoshida, Jun-ichi Ikenoue
1967 Volume 22 Issue 6 Pages
1434-1445
Published: June 05, 1967
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As a special case of the foregoing treatment of excitation, the case of free oscillation is investigated. The free oscillation of a Fabry-Perot resonator is defined by a complex frequency which satisfies a determinantal equation, and the diffraction loss and the resonant frequency are obtained. The mode patterns are given for (0, 0), (1, 0), (0, 1) and (2, 0) modes with Fresnel number
N=5, 10 and 20, some of which reproduce the fine details of the patterns found by Fox and Li.
Furthermore, the free oscillation of a deformed Fabry-Perot resonator is investigated by an application of the theory of excitation. The diffraction loss in the presence of the tilt deformation is obtained from the root of determinantal equation modified slightly by virture of the deformation, and is given by a simple algebraic expression in the same form as the previous result of the cavity theory.
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Kyoji Nishikawa, Fumihiko Takano
1967 Volume 22 Issue 6 Pages
1446-1454
Published: June 05, 1967
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A photon theory of the stimulated Raman effect is developed. A system of coupled equations for the amplitudes of scattered photons and molecular vibrations are derived. The molecular vibration coordinates are then eliminated using the random phase approximation. The equations which result assume the form of coupled equations for the first Stokes and anti-Stokes lights. The secular equation which characterizes the solution of these coupled equations is shown to be equivalent to that of Shen and Bloembergen. Using this secular equation, the condition for temporal growth of the scattered lights is obtained and is compared with that for the spatial growth, which was obtained previously by Shen and Bloembergen. It is shown that both types of growth (temporal and spatial) proceed with comparable rates if the damping of the molecular vibration is large. If its damping is small, however, the temporal growth prevails over the spatial growth. Typical line-shape of the anti-Stokes line is obtained in the case of small damping. The result shows a strong directionality, as is the case of large damping.
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Kunihiro Suzuki
1967 Volume 22 Issue 6 Pages
1454-1460
Published: June 05, 1967
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A linear theory of collision induced instability of partially ionized gases is developed for waves propagating along an external magnetic field. Transverse waves are treated. The effect of finite wave numbers is fully taken into account.
The unperturbed velocity distribution of electrons,
f0, is assumed to have a sufficiently large peak:
(
Remark: Graphics omitted.)
and the electron collision frequency ν is assumed to depend strongly on the magnitude of electron velocity:
(
Remark: Graphics omitted.)
where ν′=
dν⁄
dv.
A dispersion relation is obtained and solved numerically. Four high frequency modes are obtained. The first three modes are identified with the waves in the cold Plasma, namely, two electromagnetic modes and one Alfven mode. The fourth mode will not appear when the velocity dependence of the collision frequency ν(
v) is not explicitly taken into account. When
h>3, the last mode is unstable for small
k but it represents damping wave for large
k.
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Kenya Matsuura, Takashi Kurasawa
1967 Volume 22 Issue 6 Pages
1461-1471
Published: June 05, 1967
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The Hamiltonian formalism for nonlinear kinetics of collisionless electron plasma is established. The method deriving the fundamental equations of the nonlinear kinetics is based on a quantum statistical perturbational treatment for the interaction Hamiltonians which describe the elementary processes of the nonlinear coupling of electron plasma oscillation. The interaction Hamiltonians are obtained by the Bohm-Pines theory in an approximation of long wave-length. The lowest order process of the nonlinear interactions derived by this theory is the coupling between two modes of the oscillation in the participation of the electron. The nonlinear characters of oscillation arising from this coupling are investigated under the Maxwellian momentum distribution of electrons. From the standpoint of our theory, some remarks for several previous works are made.
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Shigeki Morioka
1967 Volume 22 Issue 6 Pages
1471-1476
Published: June 05, 1967
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The steady flow of an ideal gas with finite conductivity past a thin symmetrical semi-infinite wedge in an aligned magnetic field is considered. The wedge is assumed to be perfect conductor or insulator. The asymptotic properties of the flow field near and far from the wedge are investigated for the various values of Mach number, Alfvén number and magnetic Reynolds number of the free stream. Several informations are obtained about the structure of the weak magnetogasdynamic shock layer influenced by the boundary.
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S. N. Sen, B. Bhattacharjee
1967 Volume 22 Issue 6 Pages
1477-1482
Published: June 05, 1967
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Breakdown voltages have been measured in case of air, hydrogen, oxygen and carbon dioxide at a pressure of a few millimeters of mercury when excited simultaneously by a radiofrequency field (frequency 10.3 Mc/sec) and a variable d.c. field which varies from 0 to 240 volt/cm. It is found that the breakdown voltage increases when the d.c. field is small, and when the field is further increased it shows a maximum and then gradually falls for all the gases studied, the maximum occuring at a d.c. voltage which is different for different gases. It has been shown that, when the d.c. field is small, the dominant factor is the loss of electrons by diffusion as well as by mobility, which causes the breakdown voltage to increase, but when the d.c. field is increased, contribution due to d.c. ionization has also to be taken into consideration. This d.c. ionization causes a decrease in the radiofrequency voltage necessary for breakdown. A mathematical expression has been deduced which explains satisfactorily the observed experimental results. In the expression deduced the effect of secondary ionization as well as that of electron attachment have been taken into consideration.
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Masayoshi Tajiri
1967 Volume 22 Issue 6 Pages
1482-1494
Published: June 05, 1967
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The propagation of hydromagnetic waves of small amplitude in a collisionless plasma is considered on the basis of the Vlasov equation. It is found that there exist the Alfvén wave, the fast and the slow magnetoacoustic waves as well as the non-oscillating mode with vanishing real part of the frequency. Under some conditions, the non-oscillating wave causes the mirror instability in the direction nearly perpendicular to a magnetic field. Numerical discussions are carried out in the phase velocity plane as well as in the Friedrichs diagram for each type of waves, and are compared with the corresponding results in the Chew, Coldberger and Low approximation.
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Takayoshi Yamamoto, Kohji Ohniwa, Hideo Akimune, Tokuo Suita
1967 Volume 22 Issue 6 Pages
1495-1500
Published: June 05, 1967
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It has been confirmed experimentally that there exist both the upper and lower limits of the beam density for the spatially growing wave resulting from the beam plasma interaction to maintain its coherence. The upper limit has its originin the breaking of the resonant wave due to non-linear effects, and the lower limit is attributed to the incoherent beam wave. According to such experimental results it becomes possible to partition the parameter spaces inherentin a beam-plasma regime by some bounding surfaces into two domains; one is a coherent domain where the resonant wave keeps its coherence and the other is an incoherent one where the wave loses its coherence and hence the regime is considered to be turbulent.
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M. R. Bhiday, A. S. Paithankar, B. L. Sharda
1967 Volume 22 Issue 6 Pages
1501
Published: June 05, 1967
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Ryosei Uno
1967 Volume 22 Issue 6 Pages
1502
Published: June 05, 1967
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Kenji Morita, Hideo Akimune, Tokuo Suita
1967 Volume 22 Issue 6 Pages
1503
Published: June 05, 1967
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Masamitsu Hirai, Kunio Hashizume
1967 Volume 22 Issue 6 Pages
1504
Published: June 05, 1967
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Masamitsu Hirai, Kunio Hashizume
1967 Volume 22 Issue 6 Pages
1505
Published: June 05, 1967
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Masamitsu Hirai, Tomochika Matsuyama
1967 Volume 22 Issue 6 Pages
1506
Published: June 05, 1967
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J. Baijal, Usha Baijal
1967 Volume 22 Issue 6 Pages
1507
Published: June 05, 1967
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Syôji Matsuura, Asako Kawamori
1967 Volume 22 Issue 6 Pages
1508
Published: June 05, 1967
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Makoto Hirabayashi, Noriko Ino, Kenji Hiraga
1967 Volume 22 Issue 6 Pages
1509
Published: June 05, 1967
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Hideo Iwasaki
1967 Volume 22 Issue 6 Pages
1510
Published: June 05, 1967
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Yuichi Sakamoto
1967 Volume 22 Issue 6 Pages
1511
Published: June 05, 1967
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Kiichi Okuda, Muneyuki Date
1967 Volume 22 Issue 6 Pages
1512
Published: June 05, 1967
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Yukio Ôsaka
1967 Volume 22 Issue 6 Pages
1513-1514
Published: June 05, 1967
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Shinji Ogawa, Shinya Waki
1967 Volume 22 Issue 6 Pages
1514
Published: June 05, 1967
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Jimpei Harada, Hiroshi Motegi, Goro Honjo, Toshio Mitsui, Sadao Hoshin ...
1967 Volume 22 Issue 6 Pages
1515A
Published: June 05, 1967
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Kenzo Tanaka, Michi-hiko Mannami, Kunihide Izumi, Osamu Honjo
1967 Volume 22 Issue 6 Pages
1515B-1516
Published: June 05, 1967
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Kiyoshi Aoyagi
1967 Volume 22 Issue 6 Pages
1516-1517
Published: June 05, 1967
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Ken Suto, Masaharu Aoki
1967 Volume 22 Issue 6 Pages
1517
Published: June 05, 1967
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