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Volume 17, Issue 12
Displaying 1-19 of 19 articles from this issue
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Kasuke Takahashi, Kyûya Kotajima1962 Volume 17 Issue 12 Pages 1815-1817
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn E4 cross-over transition from the second excited 4+ state to the ground state in the isomeric decay of 204Pb was investigated by using a conventional scintillation spectrometer with an absorber technique. The experimental transition probability of the 1.274-MeV E4 gamma ray was found to be approximately 1.3×102 sec−1 or less. A hindrance factor for this E4 transition is estimated to be at least about five.View full abstractDownload PDF (280K) -
Itaru Nonaka, Yoshio Saji, Arata Suzuki, Hisashi Yamaguchi, Robert Eis ...1962 Volume 17 Issue 12 Pages 1817-1823
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSeveral targets, covering a wide range of mass number, were bombarded with the 57 MeV proton beam from the INS (Tokyo) synchro-cycrotron. Energy spectra of emitted charged particles and their angular dependence were measured. In this article (Part I), the experimental method and the results concerning emitted protons are presented. The observed proton spectra were structureless compared with those for deuterons which will be reported in Part II. However, the continuum proton spectra do have a pronounced angular dependence, which may be explained by the mechanism of direct collision of neucleons inside the nucleus and/or at the diffused rim of the nucleus. Excitation energies were determined for the few spectral peaks which were strongly excited at forward scattering angles. These peaks may be concerned with some collective excitations.View full abstractDownload PDF (736K) -
Morio Miyagaki1962 Volume 17 Issue 12 Pages 1824-1835
Published: December 05, 1962
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe azimuthal distribution of heavy nuclei in primary cosmic radiation is measured by means of orientation-controlled nuclear emulsion stack exposed at geomagnetic latitude 24°N. Assuming that the integral energy spectrum of heavy primaries is represented by N(≥E)=K(1+E)−γ, the exponent γ is obtained from the azimuthal distribution comparing with geomagnetic cut off theory. The obtained value of γ is 1.26±0.35, and this result agrees with that of Kaplon et al. but not with others. This discrepancy may be interpreted as an effect of the solar activity.View full abstractDownload PDF (1384K) -
Yoshikazu Ishikawa1962 Volume 17 Issue 12 Pages 1835-1844
Published: December 05, 1962
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic properties of FeTiO3 containing less than 50 mole percent of Fe2O3 have been re-examined between 2°K and room temperature by means of a Cioffi-type automatic fluxmeter. It was confirmed that each specimen has a low-temperature transition point, which decreases in temperature with increasing content of Fe2O3. Above the transition temperature the specimens with 8 and 12 mole % Fe2O3 show superparamagnetic behavior. By analysis of the superparamagnetic magnetization curves, the sizes of the superparamagnetic clusters were determined. The average size of clusters in these crystals is found to be explained by a simple assumption that one Fe3+ ion which enters into the Ti layers of ilmenite alignes the spins of 9 nearest neighbour Fe ions parallel by a superexchange interaction. The complete phase diagram of the ilmenite rich side of the solid solution, as revised by the present study, is presented.View full abstractDownload PDF (1016K) -
Seiichiro Noguchi1962 Volume 17 Issue 12 Pages 1844-1856
Published: December 05, 1962
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectrical resistivity, Hall coefficient and thermoelectric power have been measured for the β-, β′- and ζ-phases in the silver-zinc system to obtain same informations about their electronic structures. The resistivity of the ζ-phase is very much close to that of the β-phase but is fairly different from that of the β′-phase. The Hall coefficient and the thermoelectric power of the ζ-phrase have been observed to be fairly apart from those of both β- and β′-phases. Especially, the Hall coefficient at room temperature changes into a positive value from a negative one in the β′→ζ transition. These results imply that the ζ-phase would be stabilized by the reduction of Fermi energy due to the interaction between the Fermi surface and the Brillouin zone boundaries.
Furthermore, the specific heat measurements have been made to give us quantitative knowledge about the energy and the entropy of these three phases. The results have lead a conclusion that the internal energy of the ζ-phase is lower than that of the β′-phase by 1.4×10−2 eV/atom.View full abstractDownload PDF (1624K) -
Takashi Watanabe1962 Volume 17 Issue 12 Pages 1856-1864
Published: December 05, 1962
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic susceptibilities of single crystals of NiSO4·7H2O and α-NiSO4·6H2O have been measured in the temperature range between liquid helium and room temperatures. The magnetic susceptibility of these salts at low temperatures shows that the level splittings in the ground of each salt are not so small.
The seventh water molecule in the heptahydrate salt forms a hydrogen bond and the hexahydrate salt has not a hydrogen bond. The signs of the isotropic Weiss constant of both salts which have be obtained from the measurements of magnetic susceptibilities are opposite to each together. They are θAV=0.15±0.2°C, ga=gb=gc=2.22±0.02 for NiSO4·7H2O and θAV=−0.5±0.2°C, ga=gb=2.22±0.02 for α-NiSO4·6H2O from the expression χ=C⁄(T−θ). It has been shown that symmetry of crystalline field for NiSO4·72O is rhombic whereas that of α-NiSO4·6H2O is tetragonal. The values of the ground level splitting and exchange interaction for NiSO4·7H2O that are given from the present magnetic studies are respectively, |D–E|=2.0±0.2 cm−1, 2|E|=3.0±0.2 cm−1 and A=−0.28±0.2 cm−1. These values for a α-NiSO4·6H2O are respectively, |D|=4±0.3 cm−1, A=0.4±0.2 cm−1. The angle between the tetragonal crystalline field axes and the crystallographic c axes in α-NiSO4·6H2O is 33° from the present analysis.View full abstractDownload PDF (964K) -
Makoto Okazaki1962 Volume 17 Issue 12 Pages 1865-1876
Published: December 05, 1962
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLandau levels of holes in germanium are calculated in the case of the static magnetic field parallel to the [111] axis to determine cyclotron resonance spectrum theoretically. The calculations are not confined to the special point, kH=0, i.e. to the levels for the vanishing value of the wave vector component along the field. The shapes of the magnetic sub-bands are thus obtained with the same values of the effective mass parameters as those of Goodman. The calculations also include the warping effect of the valence band with a reasonable approximation.
The positions of peaks of cyclotron resonance absorption and their relative intensities are determined numerically from the calculated Landau levels. The theoretical absorption spectrum is shown to be modified significantly from the one in which the assumption, kH=0, is made. The results are compared with the recent experimental data of Hensel. It is found that most of the experimental peaks can be assigned by the calculated spectrum. Some of them which cannot be assigned by the assumption, kH=0, are found in fact to be explained by our prediction, i.e. the absorptions arising from kH\ eweq0.View full abstractDownload PDF (1288K) -
Yoshikazu Ishikawa1962 Volume 17 Issue 12 Pages 1877-1883
Published: December 05, 1962
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic properties of the ZnFe2O4–NiFe2O4 system were examined at low temperatures by means of a Cioffi-type automatic fiuxmeter. It was found that 90ZnFe2O4–10NiFe2O4 shows superparamagnetic behavior above 20°K. By analyzing the superparamagnetic magnetization curves of this specimen, the size distribution of the superparaniagnetic clusters, as well as the temperature dependence of magnetization inside the cluster, were determined. The superparamagnetic cluster was found to be a ferrimagnetic ordered region separated magnetically from the matrix because all tetrahedral sites surrounding the cluster are occupied by nonmagnetic Zn2+ ions. It is suggested that the deviation of the saturation magnetic moment of this system from the theoretical value is not due to a canted alignment of spins, but due to the existence of paramagnetic and superparamagnetic spins in the crystal. This suggestion was confirmed by a Mössbauer study carried out at room temperature for 60ZnFe2O4–40NiFe2O4.View full abstractDownload PDF (888K) -
Tôsaku Kimura1962 Volume 17 Issue 12 Pages 1884-1890
Published: December 05, 1962
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe molecular weight distribution of irradiated polymers is calculated numerically according to the serial solutions of Saito’s integro-differential equations in relation to crosslinking with or without degradation, and the change in shape of distribution with respect to radiation dose is also discussed. It is shown that the maximum value of weight fraction decreases with increasing radiation dose when crosslinking exceeds degradation. However, when degradation exceeds crosslinking, the maximum value increases with increasing radiation dose, On the other hand, the degree of polymerization corresponding to the maximum value always decreases whether crosslinking may exceed degradation or not. If the initial molecular weight distribution is nearly uniform, a new peak appears at the twice value of the initial degree of polymerization owing to the radiation dimerization.View full abstractDownload PDF (680K) -
Shigeo Hagiwara1962 Volume 17 Issue 12 Pages 1890-1896
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn the present experiments observations were carried out in a microwave region, where the wavelength was comparable to or shorter than a dimension of the discharge tube.
Incoherent radiation, namely, noise radiation from plasmas which were semi-opaque or opaque was observed. Comparison between the electron temperature determined from microwave measurement and that from electrostatic probe measurement gives a satisfactory agreement.
It is experimentally investigated that the plasma oscillation in a hot cathode discharge tube gives rise to radiation. Obtainable power of this radiation is estimated about 0.1 μW.View full abstractDownload PDF (940K) -
Tokio Yamadaya, Tadayasu Mitui, Takuya Okada, Naomoto Shikazono, Yoshi ...1962 Volume 17 Issue 12 Pages 1897
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (124K) -
Toru Miyakawa1962 Volume 17 Issue 12 Pages 1898-1899
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (156K) -
Tomonao Miyadai1962 Volume 17 Issue 12 Pages 1899-1900
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (176K) -
Mitsuru Suzuki, Sabur\={o} Kikuchi1962 Volume 17 Issue 12 Pages 1900-1901
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (112K) -
Chikako Yamanouchi1962 Volume 17 Issue 12 Pages 1901-1902
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (152K) -
Sadae Yamaguchi, Denjiro Watanabe, Shiro Ogawa1962 Volume 17 Issue 12 Pages 1902-1903
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (576K) -
Kazuhisa Tomita1962 Volume 17 Issue 12 Pages 1903-1904
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (96K) -
Yoichi Uchida, Eiichi Matsui, Masuo Nakagawa1962 Volume 17 Issue 12 Pages 1904-1905
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (236K) -
Hiroshi Iwasaki1962 Volume 17 Issue 12 Pages 1906
Published: December 05, 1962
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (40K)
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