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- 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
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Volume 22, Issue 1
Displaying 1-50 of 61 articles from this issue
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J. M. Kohli, I. S. Mittra, M. B. Singh1967 Volume 22 Issue 1 Pages 1-6
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESS257.7 meters of track length was followed and 631 interactions were picked up. These events have been separated into π -AgBr and π -CNO groups of nuclei on the basis of Lohrmann et al. selection criterion and also on the assumption that the overall numbers of events belonging to AgBr and CNO nuclei are governed by the geometrical cross-sections. The results regarding the mean multiplicity, angular and momentum distributions are similar in the cases of the above said selection criteria and lend some support to the inter-nuclear cascade model.View full abstractDownload PDF (768K) -
Nobuo Ito1967 Volume 22 Issue 1 Pages 6-19
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe transition of Extensive Air Shower (EAS) in the atmosphere had been estimated so far from the data of zenith angle distribution, atmosheric pressure effect etc. assuming that (a) the starting point of EAS is close to the top of the atmosphere and that (b) the lateral distribution function of charged particles is unique for all EAS. As a result of present experiment, it has been concluded that (a) there are various cases of different lateral structure in observed EAS, (b) the interaction mean free path to build up the EAS is estimated as about 100 g/cm2, and (c) the inelasticity in high energy nuclear interaction is estimated as high as about 0.7. The age parameter distribution of observed EAS suggests wide range distribution of EAS production level as well as various attenuation character for individual FAS. These problems are discussed and an experiment using water is proposed to make above points clear. The preliminary results are also shown.View full abstractDownload PDF (1612K) -
H. Kamitsubo, H. Ohnuma, K. Ôno, A. Uchida, M. Imaizumi, S. Koba ...1967 Volume 22 Issue 1 Pages 19-28
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSeveral targets, covering the spherical, deformed and transition regions of heavy nuclei, were bombarded with 55 MeV protons and angular distributions of the elastically scattered protons were measured. The diffraction structure of them are strongly damped for the deformed nuclei, as compared with that for the spherical nuclei and this feature changes gradually for nuclei of the transition region. The optical model analysis was also performed to discuss the details of the deformation effect.View full abstractDownload PDF (1132K) -
Kiyoji Fukunaga, Hitoshi Nakamura, Tetsumi Tanabe, Kazuhiko Hosono, Se ...1967 Volume 22 Issue 1 Pages 28-34
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSContinuous energy spectra of protons and alpha particles have been studied in the deuteron-alpha particle scattering at the incident deuteron energy of 14.2 MeV. In the energy spectra of protons, the evidence for a final state resonance in the neutron and alpha particle system have been obtained and the energy spectrum is compared with the theory of final state interaction. There is a good agreement between the experiment and the theory. The angular dependence of the cross sections at peaks shows a stripping-like feature. The energy spectrum of the alpha particles at the higher energy is mainly affected by the effect of the final state interaction of the triplet S state in the neutron and proton system. The angular dependence of these alpha particles shows a forward peak in the laboratory system and it may be explained by an exchange process.View full abstractDownload PDF (748K) -
Kenji Katori, Ren Chiba, Kiichi Etoh, Tohru Murata, Masushi Mori, Nawo ...1967 Volume 22 Issue 1 Pages 35-45
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSExcitation functions for elastic scattering of protons on Ne22 were studied at θc.m.=56.9°, 92.6°, 125.7°, 140.8° and 151.3° in the energy range Ep=0.94−4.2 MeV. The excitation function for protons inelastically scattered to the first excited state of Ne22 was measured at θlab.=139.1° above Ep=2.1 MeV and the γ rays following them were observed below Ep=2.1 MeV.
A total of 75 resonances was observed corresponding to Na23 levels between 9.7 MeV and 12.8 MeV. Several pronounced resonances are analysed using the single level approximation of the dispersion formula, and level parameters are assigned. The T=3⁄2 isobaric analogue states in Na23 and Ne23 are discussed.View full abstractDownload PDF (1248K) -
Jimpei Harada, Goro Honjo1967 Volume 22 Issue 1 Pages 45-57
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThermal diffuse scattering of X-rays by tetragonal barium titanate is studied. Two kinds of diffuse streaks, SA and SO, are observed in addition to thermal diffuse spots F near reciprocal lattice points. SA and F, which show intensity modulation in phase with the static structure factor, are due to acoustic lattice vibration. SO, which shows a different intensity modulation from them, is concluded to be due to low frequency transverse optic lattice vibration which plays an important role in the ferroelectric transition of the substance. The mode is a streching type vibration in which all the oxygen atoms vibrate to the oposite direction against barium and titanium atoms, and the frequency is estimated to be of the order of 1012cm−1. The atomic shifts of ferroelectric polarization are discussed in relation to the vibration.View full abstractDownload PDF (2536K) -
Takeo Izuyama1967 Volume 22 Issue 1 Pages 58-77
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe critical phenomenon of the second order phase transition is considered for temperatures above the critical point. A general phenomenological approach is developed. The generalized free energy F[{ηq}: T] is introduced. It is a functional of the Fourier component ηq of the local order parameter η(r). A general property of the correlation function ⟨ηqη−q⟩ is established rigorously. The equilibrium free energy and the wave-number dependent susceptibility χq are expressed in terms of the linked clusters, large clusters corresponding to highr order fluctuation of the order parameter. The general rule for calculating the contribution of each cluster is given. The rule is shown to be very simple. It is found that the specific heat is expressed as a sum of the temperature derivatives of χq’s. As an example of the application of the linked cluster method, the susceptibility is calculated in the vicinity of the critical point by summing up the clusters that are most divergent when approaching the criticat point. The linked cluster expansion developed here could be a clue to the whole mystery of the singularity at the critical point.View full abstractDownload PDF (2268K) -
Anil Saran, Yashwant Singh, A. K. Barua1967 Volume 22 Issue 1 Pages 77-81
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe contribution of metastably bound double molecules to the second virial coefficient B(T) of a polar gas has been calculated by assuming the dipoles to be in the head-to-tail position. The same results can also be applied for any ‘effective’ relative orientation of the dipoles. The percentage of dimers has been calculated from the contribution of bound and metastably bound double molecules to the second virial coefficient for NH3 and CHCl3. The results have been compared with those obtained from the semiempirical approach of Hirschfelder, McClure and Weeks.View full abstractDownload PDF (568K) -
Hachiro Akama, Terutosi Murakami1967 Volume 22 Issue 1 Pages 82-88
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA method for obtaining nonlinear characteristics of the linear Boltzmann or Master operator is given. In order that the probability distribution be the standardized Gaussian distribution at equilibrium, the Hermite coefficients of derivate moments satisfy algebraic relations which are altogether equivalent to the principle of detailed balance. The number of independent Hermite coefficients of the tensorial order n is n⁄2 when n is even and (n−1)⁄2 when n is odd. The relation of the tensorial order two reduces to the Einstein relation and corresponds to linear fluctuations. Relations of the higher order represent nonlinear effects. These relations are independent of the detailed mechanism of processes. They hold for N-dimensional processes, where N is finite. The theory is then applied to the three-dimensional Rayleigh model.View full abstractDownload PDF (764K) -
Takeshi Morimoto, Jin-ichi Takamura1967 Volume 22 Issue 1 Pages 89-104
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to obtain the detailed information on the valence band of bismuth crystals, the low-field galvanomagnetic tensor components of 0.2 atomic percent tin-doped bismuth single crystals were measured at 77°K together with the angular dependence. The results are interpreted in terms of one heavy-hole and three light-hole ellipsoid model. The values of the mobility tensor determined from the model are in fairly good agreement with experiments, and the tilt angle for the light-hole ellipsoid is estimated to be about 15°. The temperature variations of the resistivity, Hall coefficient and magnetic susceptibility were also measured, and the discussions based on the present model are made.View full abstractDownload PDF (1464K) -
Ikuyo Shiozaki, Takao Sato1967 Volume 22 Issue 1 Pages 105-108
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe variations of the Hall coefficients RH of indium and indium-rich alloys (In–Pb, In–Cd, In–Tl and In–Hg) have been determined as functions of temperature. RH for pure indium varies from +0.979 at −195.8°C to −1.020×10−11 (m3/coul.) at 110°C, the sign being reversed at about 0°C. The values of RH for In–Pb, In–Tl and In–Cd deviate to the negative side at about −195.8°C. At temperatures higher than about 0°C RH for these alloys show variations similar to that in pure indium.
The relation of the observed behavior of RH to that of the axial ratio c/a is discussed. An attempt is made to explain it in terms of the anisotropy of electronic relaxation times τp and τi, which are due to phonon and impurity scatterings respectively.
The temperature dependences of RH in aluminium and lead are similar to that in indium. It seems that the temperature dependence of RH in these metals is chiefly determined by the nature of the carriers in the 2nd Brilloin zone.View full abstractDownload PDF (488K) -
Koichi Sugiyama1967 Volume 22 Issue 1 Pages 109-117
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetoresistance in the impurity band conduction has been measured on n- and p-type germanium. Large uniaxial stress is applied to remove the degeneracy of the conduction or valence band edge and to make the band structure simple. The magnetoresistance consists of three components: the negative anomalous magnetoresistance, the positive magnetoresistance having H2 dependence, and the Shubnikov-de Haas effect. These components have anisotropies with respect to the magnetic field direction. The anisotropies and other properties of these components are discussed in terms of the parameters of the simplified conduction or valence band.View full abstractDownload PDF (1168K) -
Kyôzô Takeyama, Masayuki Kawahito, Makoto Okazaki, Minoru ...1967 Volume 22 Issue 1 Pages 118-127
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith the help of the effective mass theoretical approaches, energy levels are calculated for ionized homopolar pairs of impurities in n-type and p-type silicon under magnetic and stress fields. Two impurity ions which constitute the pair are assumed to lie along the (001) directions of the crystal. The microwave double resonance experiment recently performed by Tanaka et al. is analyzed with the use of the obtained level schemes. Brief discussions on transition probabilities and relaxation times are added.View full abstractDownload PDF (1200K) -
Shoji Tanaka, Atsushi Koma, Mineo Kobayashi1967 Volume 22 Issue 1 Pages 127-137
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectron double resonance experiments were made at 4.2°K and 1.3°K for the ionized impurity-pairs in n- and p-type silicon containing 1.1∼16.2×1016 cm−3 impurities. The frequencies of the signal and the pump microwaves were ≈9 Gc and ≈22 Gc, respectively. The change in the absorption of the 9 Gc microwave was measured as the magnetic field was swept. In n-type samples two peaks were observed in the electron double resonance: the one at 4.4 kOe corresponds to a decrease in absorption and the other at 11.4 kOe to an increase in absorption. Each of these peaks splits into two if the pumping is strong enough. These peaks were observed in Sb- and As-doped samples, but not in P-doped samples. In p-type samples two broad peaks were observed at 4.6 kOe and at 11.5 kOe, both corresponding to decreases in the 9 Gc absorption. The structure of the ionized donor- and acceptor-pairs are discussed and compared with the Takeyama et al.’s calculations. The saturation characteristic of the resonance peak in p-type samples is analysed using the simplified three-level model. The experiments using 23 Gc and 51 Gc microwaves were also made.View full abstractDownload PDF (1388K) -
Toshio Ikeda, Shigetomo Yoshida1967 Volume 22 Issue 1 Pages 138-143
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA study of the effect of Cd, Pb and Mn on the formation of colloids in NaCl by electron irradiation has been made by the measurement of optical extinction spectra. The concentration and particle size of colloids have been estimated by comparing the extinction curves with the results calculated by Savostianowa. The observed spectra show that the concentration of colloids increases and the particle size decreases as the concentration of divalent cation impurity increases. A simple theory of the effect of divalent cation impurities on the formation of colloids is described in relation to the nucleus and the process of coagulation.
The thermal bleaching of colloidal coloration has also been investigated in both the pure and the impurity-doped regions. The bleaching of colloidal coloration is more remarkable in the region of higher concentration of divalent cation impurity.View full abstractDownload PDF (884K) -
B. V. Paranjape1967 Volume 22 Issue 1 Pages 144-148
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is found that in some semiconductors when the electric current exceeds a critical value Ic most of the current carriers are pinched in the centre of the sample. The current carriers near the boundary are pulled towards the centre, because of the magnetic field produced by the elements of the current in the interior. Bennett has solved the steady state problem and obtained conditions necessary for the pinch. He has neglected the effect of generations and recombinations of electron hole pairs. In the present paper the properties of a steady state pinch are studied taking account of carrier generation and recombination.View full abstractDownload PDF (716K) -
Ken Suto, Masaharu Aoki1967 Volume 22 Issue 1 Pages 149-155
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOptical excitation spectra and quenching spectra of the paramagnetic resonance of Cr+ in ZnTe have been measured. Two different excitation bands are exhibited in the excitation spectra. One is a broad band corresponding to the excitation of holes from Cr acceptors to the valence band, and the other is that found at the high energy side of the spectra; this corresponds to the excitation of electrons from charged Zn vacancies to the conduction band. The latter is caused by the excess of Te used to lower the melting temperature of ZnTe. The quenching spectra correspond to the excitation of electrons from the charged Cr acceptors to the conduction band. From these data the energy levels of Cr acceptor and Zn vacancy were determined.
Photoconductivity associated with the excitation of the paramagnetic resonance was also measured with a microwave absorption method. The negative photoconductivity was observed in the same wavelength region as the excitation band of the paramagnetic resonance. A resonance absorption mechanism of the microwave by hopping electrons among the Zn vacancies is proposed to explain this phenomenon.View full abstractDownload PDF (992K) -
Norio Achiwa, Shuya Yano, Motoyoshi Yuzuri, Hideo Takaki1967 Volume 22 Issue 1 Pages 156-157
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe direction of magnetic moment and the magnetic anisotropy energy of Fe2As in the c-plane were determined from measurements of magnetic anisotropy and field dependence of magnetizations on a single crystal disk of Fe2As at liquid nitrogen temperature. The magnetic moment is in the ⟨100⟩ direction. The magnetic anisotropy energy is estimated at 7×102 erg/g from the saturation of torque amplitude.View full abstractDownload PDF (200K) -
Hiroshi Iwasaki, Shiro Ogawa1967 Volume 22 Issue 1 Pages 158-164
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurement of order in the long period ordered alloy CuAuII has been made on a powdered specimen of the Cu-51.7 at.% Au alloy at temperatures between 375 and 400°C by the use of an X-ray diffractometer equipped with a high-temperature specimen holder. The Fourier coefficients, S1 and S3, of the order parameters defined by Tachiki and Teramoto for this ordered alloy have been determined by comparing the intensities of the superlattice reflections, 1,1+1⁄2M,2, 1,1−1⁄2M,2, 1,1+3⁄2M,0, 1,1+1⁄2M,0, 1,1−1⁄2M,0,1, 1−3⁄2M,0, with the intensity of the fundamental reflection, 0, 0, 2. The observed values of the coefficients are considerably lower than the ideal values for a perfectly ordered state. |S1| being about 80–70% and |S3| being only about 40–30% of the ideal ones. The observed lowering of order in CuAuII is in a rough agreement with the theoretical prediction given by the above investigators. |S1| and |S3| do not appreciably decrease with rising temperature between 375 and 390°C, but they begin to fall as the temperature approaches Tc. This temperature dependence of order is somewhat different from the theoretical prediction.View full abstractDownload PDF (784K) -
Muneyuki Date, Mitsuhiro Motokawa1967 Volume 22 Issue 1 Pages 165-173
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAntiferromagnetic resonance in NiCl26H2O was investigated experimentally in the frequency range from 24 to 90 Gc/sec at liquid helium temperature using pulsed magnetic fields. The critical field Hc was determined to be 40±1 kOe. The orthorhombic anisotropy fields HA1, HA2 and the exchange field HE were found to be HA1=9.5±0.5, HA2=12.5±0.5 kOe, and HE=86±1 kOe by extending the theory of antiferromagnetic resonance to the strong anisotropy case. The anisotropy comes mainly from the crystalline field constants D and E which were estimated at −1.2cm−1 and 0.15 cm−1, respectively. It was found that the spin easy axis is in the ac-plane and differs by an angle 7° from the a-axis. A very broad paramagnetic resonance was observed at 80°K. The origin of this broad line was attributed to the exchange mixing of several paramagnetic resonance lines.View full abstractDownload PDF (1184K) -
Hiroshi Yasuoka, Akira Hirai, Teruya Shinjo, Masao Kiyama, Yoshichika ...1967 Volume 22 Issue 1 Pages 174-180
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn order to determine the metal ion distribution in a new type manganese ferrite (MnFe2O4), which was prepared by precipitation from aqueous solution, the nuclear magnetic resonance (NMR) of Mn55 was studied. In this ferrite, two separate resonance signals were observed, which were identified as associated with Mn2+ ions located at the tetrahedral (A-) and the octahedral (B-) sites respectively. By integrating those NMR spectra, it was decided that about 10% of Mn2+ ions are present at B-sites. Using the ratio of the amount of the Mn2+ ions located at A-sites to that at B-sites and the value of saturation moment (4.2μB), the metal ion distribution in this manganese ferrite was determined to be Mn0.482+Fe0.523+(Mn0.062+Mn0.463+Fe1.023+Fe0.462+)O4. From the temperature dependence of the resonance frequency, the Curie temperature was estimated to be 770°K. The high Curie temperature compared with that of ordinary manganese ferrite (573°K) is explainable by the above metal ion distribution. It was found that the metal ion diffusion between A- and B-sites occurs at about 250°C, and above 450°C the metal ion distribution accords with that of ordinary manganese ferrite.View full abstractDownload PDF (1280K) -
Okikazu Akimoto, Hiroshi Hasegawa1967 Volume 22 Issue 1 Pages 181-191
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOptical spectrum of a hydrogenic exciton in a uniform, static magnetic field is discussed. Based on a model previously introduced by Shinada and Sugano, i. e. the “two-dimensional model,” the energy levels and the relative oscillator strengths for the “allowed case” are calculated as functions of the static magnetic field of arbitrary strength. The present work is also an extension of the previous works of Elliott-Loudon and Hasegawa-Howard, in which the magnetic field was limited to an extremely strong region (the cyclotron energy is much larger than the Rydberg energy). It is shown that the two-dimensional model can render the two concepts “exciton” and the “Landau levels” compatible. A method of extending the two-dimensional model to the three dimension is also given.View full abstractDownload PDF (1308K) -
Seiichirou Inoue, Mikio Tsuji1967 Volume 22 Issue 1 Pages 192-201
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anisotropy of ultrasonic attenuation is calculated by using Pippard’s formula for a model in which the Fermi surface consists of a single prolate spheroidal surface. For longitudinal ultrasounds the attenuation coefficient α shows two maxima in the regions δ=35°∼45° and 145°∼135°, but for transverse ultrasounds α shows a maximum at δ=90°, where δ is the angle between the major axis of the spheroid and the direction of propagation. Next, the method is applied to bismuth for longitudinal sound waves. In this case, however, because of a large deformation potential, the general features of the anisotropy are very different from the former case. Moreover, in this case the anisotropy of the deformation potential itself seems to play a very important role.View full abstractDownload PDF (1204K) -
Nobuo Nakamura, Hideaki Chihara1967 Volume 22 Issue 1 Pages 201-209
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNuclear quadrupole resonance frequencies of 35Cl and 37Cl in solid chlorine were measured between 20°K and its triple point 172°K. The spectrum consists of a doublet at low temperatures because of isotopic splitting. The results were analyzed in terms of temperature-dependent libration frequencies in a quasi-harmonic approximation. The quadrupole coupling constant for 35Cl was found to be 108.975±0.003 Mc/sec at 0°K and 109.872±0.010 Mc/sec for the static lattice. The librational frequency was 90.1±3.0 cm−1 at 0°K decreasing to 74.3 cm−1 at 160°K. The lower limit to the asymmetry of the electric field gradient was 8.5% in comparison to bromine (20%) and iodine (17.5%), showing the existence of some covalent character in the intermolecular forces. Some problems concerning the intermolecular potential in solid and gaseous chlorine are pointed out in connection with the re-analysis of the second virial coefficient.View full abstractDownload PDF (1076K) -
Takeo Miyata, Tetsuhiko Tomiki1967 Volume 22 Issue 1 Pages 209-218
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn the tail part region of the first exciton band, the absorption constant (10−1 to 102 cm−1) was measured on zone-refined and Harshaw NaCl single crystals from 10°K to 573°K. Fundamental absorption tails of pure NaCl single crystals are represented by the modified Urbach rule, which describes the influence of zero-point lattice vibrations at low temperature. Analysing a temperature dependence of Urbach constant σ=σ0F, it was found that σ0=0.757 and the temperature of zero-point phonon is ωh⁄2=58.2°K.
Reflection spectra of single crystals were measured from 2112Å to 1060Å in the same temperature range. The peak shift of the first reflection band is investigated as a function of temperature to clarify the mode of phonons interacting with the exciton in the main part of the band.View full abstractDownload PDF (1216K) -
Nobuhiko Saitô, Kunihiko Takahashi, Yasuo Yunoki1967 Volume 22 Issue 1 Pages 219-226
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe statistical mechanical theory of stiff chains which can be represented by differentiable space curves is developed by the analogy of the path integral formulation in quantum mechanics. The second and fourth moments of end-to-end distance of the chain are calculated. The stretching and contraction of the chain are also taken into account. The Brownian motion of the stiff chain is discussed, and some statistical properties, especially the correlation function of random forces, are determined.View full abstractDownload PDF (604K) -
Mitiko Go, Nobuhiko Saito, Moyuru Ochiai1967 Volume 22 Issue 1 Pages 227-233
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe conformation of polypeptides in helix-coil transition region is not Gaussian. In the present work an interrupted helix model of polypeptide chain is adopted in which random coil parts and rod-like helix parts are connected by universal joints alternately. The second and the fourth moments, ⟨R2⟩ and ⟨R4⟩, are calculated. It is found that under certain conditions shallow minima appear in ⟨R2⟩ and ⟨R4⟩ at the transition region. From both of ⟨R2⟩ and ⟨R4⟩ the deviation from the Gaussian chain is calculated, and the polypeptide chain in the transition region is shown to have a conformation of swollen Gaussian type.View full abstractDownload PDF (612K) -
Masahiro Tanaka1967 Volume 22 Issue 1 Pages 233-237
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe reaction kinetics of irradiated RNA molecules is analyzed for cases in which dimer formations and hydrations of uracil residues occur simultaneously. The interferences between the reactions on adjacent reactant sites and the effect of the base sequences of RNA molecules are taken into account. These correlations lead to an infinite hierarchy of kinetic equations and in a first approximation a set of second order kinetic equations is obtained. Numerical solutions are presented compared with those of usual linearized kinetic equations.View full abstractDownload PDF (548K) -
Yoshika Masuda, Masahiro Nishioka, Naoko Watanabe1967 Volume 22 Issue 1 Pages 238-247
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe nuclear spin-lattice relaxation times (T1) of V51 and Nb93 in the body-centered cubic Ti–V–Fe and Zr–Nb–Mo alloy systems have been measured. The product of T1 and temperature T, T1T is strongly dependent upon composition. These relaxation behaviours can be correlated to that of the low temperature specific heat.
The Knight shifts of Nb93 nuclear magnetic resonance in Zr–Nb–Mo alloy systems have also been measured. The composition dependence of Knight shift can be related to the relaxation result as well as to the results on low temperature specific heat and magnetic susceptibility.
The electronic specific heat coefficient γ of Zr–Nb alloys has been measured for the sake of interpretation of the experimental behaviours of T1 and Knight shift.View full abstractDownload PDF (1236K) -
Hiroki Nakamura, Michio Matsuzawa1967 Volume 22 Issue 1 Pages 248-256
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe exact resonant process H*(2p)+H(1s)→H(1s)+H*(2P), of which the interaction is a typical long range one, has been investigated by the method of perturbed stationary state. The energy curves of interaction of normal and excited hydrogen atoms necessary for the determination of the cross section are calculated by the Heitler-London procedure. The computations of the cross section are carried out at energies of relative motion 0.1, 1.0, 3.0, 5.0 and 10.0 eV. The results agree well with the corresponding calculations by the impact parameter method. At 0.1 eV the calculated cross section is 821 πa02.View full abstractDownload PDF (856K) -
Yukio Obata1967 Volume 22 Issue 1 Pages 256-263
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe nuclear spin relaxation rate of protons in copper acetate monohydrate is calculated. The rate is found to be proportional to c, the population of the upper triplet state of coupled copper ion pair, at lower temperatures. If only the inter-pair interaction between the nearest copper ions on adjacent pairs is taken into account, the rate becomes proportional to c⁄(1−c⁄3)1⁄2. The agreement between theory and experiment is fairly satisfactory.View full abstractDownload PDF (728K) -
Eiichi Ishiguro, Michiko Kobori1967 Volume 22 Issue 1 Pages 263-270
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpin orbit coupling constant is calculated for various diatomic molecules. SCF MO theory is adopted. Two-center integrals are neglected except the overlap integral. One-center integrals are estimated from atomic ζn,l. The agreement with experiment is excellent. Correlation between the electro-negativity difference and the coupling constant is pointed out. As an application of the theory, electronic structures of the ground state and the lower excited states of the O2+ molecule are discussed.View full abstractDownload PDF (748K) -
Toshihiko Dote, Hiroshi Amemiya1967 Volume 22 Issue 1 Pages 270-276
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn analysis is made of the characteristics of a cylindrical probe in a magnetic field, for the voltage region above the plasma space potential. It is assumed in the analysis that the plasma and the sheath are completely separated. The equation for the probe current is numerically solved in a dimentionless form for several values of αξp With the sheath thickness as a parameter, where α and ξp are the normalized magnetic field and the probe radius, respectively. The probe characteristics are obtained by eliminating the sheath thickness from the probe equation, and the space-charge-limited current in a magnetic field between coaxial cylinders is calculated under the condition that electrons leave the outside cylinder without initial velocity. The negative characteristic is shown to appear when α≥0.5 and a≥0.8, where a=αξp⁄2\sqrt2.View full abstractDownload PDF (656K) -
Takayoshi Yamamoto, Kohji Ohniwa, Hideo Akimune, Tokuo Suita1967 Volume 22 Issue 1 Pages 277-284
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA modulated weak electron beam is injected into a low-density diffused plasma and growth rates of convective instabilities are observed. The growth rates obtained experimentally are in pretty good agreement with those calculated from the dispersion relation including only the collisional damping effect if the beam density is relatively low. However, if the beam density is high, the experimental results conspicuously deviate from the calculated values. These results suggest that it becomes difficult for the amplified wave to maintain its coherence as the amplitude increases, and that such non-linear effect would cause breakdown of the amplified waves. The ratio I1⁄I0 is adopted as a measure of the threshold over which the non-linear effect becomes remarkable, where I0 and I1 are the zero-order and first order electron currents in the beam-plasma system respectively. As I1⁄I0 approaches unity breaking of the wave becomes observable.View full abstractDownload PDF (1004K) -
Ginko Satô1967 Volume 22 Issue 1 Pages 284-292
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe expressions for diffracted fields in the geometric optical shadow region on the earth surface and near the boundaries where the medium changes continuously are derived in higher degree of approximation than those of the ray approximation in previous papers. The diffracted field strengths are numerically given as functions of the horizontal distance between the observing point and the dipole source with the primary fields and the once reflected fields. The intensities of the diffracted field are affected more sensibly by the inhomogeneity than the wave length. The behaviors of the diffracted fields at the continuous boundaries are similar to those at the discontinuous boundary, which have never been expected in case of the homogeneous medium.View full abstractDownload PDF (1016K) -
Michio Matsumoto1967 Volume 22 Issue 1 Pages 292-300
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA cylinder of collision-free plasma in a strong, uniform magnetic field parallel to its axis is studied theoretically. A plasma of cylindrical symmetry in equilibrium is assumed to have a current due to the electron velocity distribution of a shifted Maxwellian type. Drift instability is discussed for the density profile n(r)=N0(1−r2⁄a2), N0 being the density on the axis. The drift waves are shown to grow to form a nonlinear equilibrium spectrum and to generate an anomalous diffusion, whose coefficient is about one-tenth of Bohm’s in magnitude.View full abstractDownload PDF (848K) -
Shigetoshi Tanaka, Kazuo Takayama1967 Volume 22 Issue 1 Pages 300-306
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anomalous bremsstrahlung from partially ionized plasmas is observed in the absence as well as in the presence of the magnetic field when the detecting frequency f is smaller than a critical frequency fcrit, which is somewhat smaller than the collision frequency of plasma electrons; on the other hand, the anomalous cyclotron emission described previously appears when f exceeds fcrit. The experimentally observed characteristics of the former emission are very similar to those of the latter, except for their dependence on the magnetic field and their frequency ranges.
The theoretical considerations suggest that the effect of negative absorption due to the stimulated bremsstrahlung may occur in plasmas. It is shown that we can interpret the anomalous bremsstrahlung as a phenomenon resulting from this effect.View full abstractDownload PDF (1128K) -
Choji Nakaya, Tsutomu Kambe1967 Volume 22 Issue 1 Pages 306-309
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe stability of a two-dimensional unsteady flow of an incompressible viscous fluid is investigated by the method of small perturbation theory. An incompressible fluid is bounded by an infinite plane surface. The basic flow is such that the plane is given an impulsive start and then moves with constant velocity in its own plane. By the use of Lin’s procedure the relation between the Reynolds number of the basic flow which depends on time and the wave number of the neutral oscillation and also the minimum critical Reynolds number are calculated numerically.View full abstractDownload PDF (328K) -
Shigetoshi Tanaka, Kazuo Takayama1967 Volume 22 Issue 1 Pages 310-318
Published: January 05, 1967
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe amplification of radio-frequency wave is observed in partially ionized gases, having large Ramsauer effect, in the absence of magnetic field. This paper gives results showing power gains of more than 4 db at 60 Mc/s and 3 db at 20 Mc/s in a xenon discharge plasma. By adjusting a dc grid current of a triode-type discharge tube, a strong attenuation or an amplification of an applied rf wave or an intense rf emission with no input signal is observed. This phenomenon occurs in pulses at some definite phase of a lf oscillation existing in the dc discharge when the detecting frequency is smaller than the critical one, which is somewhat smaller than the collision frequency of the plasma electrons. It is considered that experimental results are interpreted as a phenomenon of the negative absorption due to the stimulated bremsstrahlung in partially ionized gases.View full abstractDownload PDF (1132K) -
Yoshiharu Shimomura, Sho Yoshida1967 Volume 22 Issue 1 Pages 319-331
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAluminum of three different purities have been quenched in the atmospheres of hydrogen, carbon monoxide, dry air, wet air and vacuum, respectively, and secondary defects formed have been examined by electron microscopy. Voids are preferentially formed by quenching in atmospheres of hydrogen and wet air, while they are hardly formed in carbon monoxide, dry air and vacuum. These results are interpreted as the heterogeneous formation of all voids by dissolved hydrogen atoms. Discussions are given on the possibility of heterogeneous nucleation of voids, their formation mechanism and the effect of metallic impurities on the formation of voids. Previously published data of the void formation are reconsidered from the stand point of the heterogeneous nucleation of voids.View full abstractDownload PDF (5508K) -
Hidenori Kubo, Junkichi Itoh1967 Volume 22 Issue 1 Pages 332
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Kay Kohn, Reijiro Fukuda, Shuichi Iida1967 Volume 22 Issue 1 Pages 333
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Akira Harasima1967 Volume 22 Issue 1 Pages 334
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Akira Nakamura, Nobumori Kinoshita1967 Volume 22 Issue 1 Pages 335
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Sadasuke Ishimura, Sonoko Tsukahara, Hisazo Kawakatsu, Tomio Nagashima1967 Volume 22 Issue 1 Pages 336
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Tetsuhiko Okamoto, Hironobu Fujii, Michiyoshi Tsurui, Hiroshi Fujiwara ...1967 Volume 22 Issue 1 Pages 337
Published: January 05, 1967
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Hitosi Yasunaga, Ichiroh Nakada1967 Volume 22 Issue 1 Pages 338
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Keiichi Imakubo, Takenobu Higashimura, Tunahiko Sidei1967 Volume 22 Issue 1 Pages 339
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Masaharu Toyama, Seishi Iida1967 Volume 22 Issue 1 Pages 340
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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Ken-ichiro Takeda, Sonoko Tsukahara, Tomio Nagashima1967 Volume 22 Issue 1 Pages 341
Published: January 05, 1967
Released on J-STAGE: May 29, 2007
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