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Takeki Iwashita
1965 Volume 20 Issue 12 Pages
2105-2117
Published: December 05, 1965
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The decay scheme of Eu
159 was investigated by using beta and gamma ray scintillation spectrometers with a fast-slow coincidence circuit. The half-life of Eu
159 was measured as 19.0±0.5 min. Beta rays with end-point energies 2.57±0.05, 2.35±0.05, 1.90±0.05, 1.75±0.05, 1.50±0.05 and 1.0±0.1 MeV, and gamma rays with energies 1500, 1100, 800, 670, 220, 145, 130, 90 and 75 keV were found. On the bases of the experimental results obtained by β-γ, γ-β and γ-γ coincidence measurements, a tentative decay scheme of Eu
159 was proposed. The assignments of the excited levels were made based on the Nilsson model and the systematics in neighbouring odd-N nuclei. The systematic behaviour of low excited levels of gadolinium isotopes and
N=95 isotones are discussed.
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Yoshihide Ishizaki, Ken Kikuchi, Kazuhisa Matsuda, Takashi Mikumo, Yut ...
1965 Volume 20 Issue 12 Pages
2118-2128
Published: December 05, 1965
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With 57 MeV incident protons, energy spectra of deuterons from the (
p,
d) reactions on C
12, Al
27, Ni
58, Ag, Sn, Au
197 and Bi
209 have been measured by a scintillation counter telescope. Several prominent peaks were observed on C
12, Al
27 and Ni
58 while very few on Ag, Sn, Au
197 and Bi
209. The energy resolution was about 2.5% at half maximum. Angular distributions were obtained for the prominent peaks and were analyzed in terms of
jl(
qr)
2 and of Butler curves. The peaks are considered to correspond to removal of neutron leaving a hole in a single particle state occupied in the target nucleus. In some cases, however, residual interactions may be taken into account. No clear peak was observed in the region of
Q value less than about −25 MeV.
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Hiroshi Iwasaki
1965 Volume 20 Issue 12 Pages
2129-2140
Published: December 05, 1965
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The alloy of the composition of nearly Au:Zn=5:3 forms the β′-phase with the ordered β-brass type structure above 500°C. When this alloy is rapidly cooled from 600°C to room temperature, a metastable phase is formed, and if it is annealed at 200°C for more than an hour, it transforms into the stable phase, Au
5Zn
3.
The crystal structure of the metastable phase has been determined by X-ray diffraction using single crystals. The unit cell is orthorhombic with the dimensions of
am=6.332,
bm=8.953 and
cm=4.477 kX, and a probable space group is
Pmc2
1. The atomic arrangement is fundamentally of the body-centered cubic lattice type, but atoms are located in positions slightly shifted from the lattice points of the fundamental lattice. All of atoms have components of shifts along the
cm-axis which are considered to be due to a relative gliding of every two (011) atomic planes of the original β′-phase lattice along the [01\bar1] direction. There are six equivalent orientation relationships between the unit cell of the metastable phase and that of the original β′-phase. They are expressed as follows:
(100)
m⁄⁄{100}
β′[010]
m⁄⁄〈011〉
β′.
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Takao Nakano, Kenshiro Nakashima, Yoshio Inuishi
1965 Volume 20 Issue 12 Pages
2140-2146
Published: December 05, 1965
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The annealing of changes in the electrical properties of silicon caused by Co
60 gamma irradiation at room temperature has been investigated by isochronal annealing and lifetime techniques. For recombination centers introduced by Co
60 gamma rays, the recombination energy level position was placed at 0.21 eV and 0.27 eV above the valence band for the
p-type pulled and fioating zoned silicon, respectively. The annealing activation energies of the recombination centers were 0.75 eV and 1.4 eV for the
p-type pulled and fioating zoned silicon, respectively. In
p-type silicon there is a remarkable process of annealing of the recombination centers at about 300°C. The interaction between defects and dislocations were considered from the introduction rates and the annealing characteristics.
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Shoji Makishima, Hajime Yamamoto, Takeshi Tomotsu, Shigeo Shionoya
1965 Volume 20 Issue 12 Pages
2147-2151
Published: December 05, 1965
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Luminescence spectra of Sm
3+ at a Ti
4+ site in BaTiO
3 host lattice were investigated in a wide range of temperatures including those above the Curie point. Any shifts of emission lines were not observed between −196°C and 145°C. The ferro-to-paraelectric transition is considered not to influence the strength of the electrostatic field surrounding Sm
3+ so much as to induce a detectable shift of the 4
f electron levels. Some singlet lines were found to split into doublets associated with the transitions of the crystal structure from the cubic to tetragonal and also from the rhombohedral to orthorhombic phase. These facts are accounted for by considering the change of the site symmetry around Sm
3+.
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Shozo Ikeda, Tomoyuki Takeuchi
1965 Volume 20 Issue 12 Pages
2152-2160
Published: December 05, 1965
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The condition for the appearance of twinning deformation have been investigated in iron single crystals extended in the [110] and the [100] axes. The twinning stress which was defined by the maximum stress of the first twin drop in a stress-strain curve has varied with the extension speed, especially, at a high temperature within the limit of twinning deformation. The delay times for the appearance of twinning deformation under creep tests have shown a dependence on the applied stress similar to the relation between twinning stress and crosshead speed. It is concluded from the observed results that the appearance of twinning deformation in iron single crystals is assisted by the preceding slip deformation.
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Nobuo Mikoshiba
1965 Volume 20 Issue 12 Pages
2160-2166
Published: December 05, 1965
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A three-phonon process via a nonlinear interaction of acoustic waves with conduction electrons is studied based on the semiclassical Boltzmann equation treatment. The Hamiltonian for this process is given in the form which is easily applied to the discussion of non-Ohmic behaviors observed in CdS and Bi. The order of magnitude of the new process is examined in terms of the effective third-order elastic constant, which depends strongly on the carrier concentration, the wave number and the temperature. In a restricted range of wave number, the new process predominates over the usual three-phonon process due to the anharmonic interaction in lattice vibrations in the following cases: (1) CdS with carrier concentrations 10
12–10
15 cm
−3, (2)
n-Ge with carrier concentration 10
16cm
−3 at low temperatures, (3) Bi in the absence of a magnetic field. In Bi in a strong magnetic field, the magnitude of the new process becomes much smaller than the usual one.
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Hisao Yamamoto
1965 Volume 20 Issue 12 Pages
2166-2169
Published: December 05, 1965
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The hyperfine fields for an Fe atom in ferromagnetic intermetallic compounds, Fe
3Ge and Fe
5Ge
3, have been investigated by using the Mössbauer effect. The hyperfine fields at a given Fe site of ε
1 and ε phases in Fe
3Ge were nearly equal to each other in spite of the difference in the environment beyond second neighbours which affected their Curie temperatures. The hyperfine field on 2(a) site of Fe
5Ge
3 is 136KOe which is unexpectedly small in comparison with the neutron diffraction data by Katsuraki. The hyperfine field on 2(d) site has two values (214KOe and 256KOe) which suggests the existence of two magnetic sublattices associated with this site.
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D. Watanabe, P. M. J. Fisher
1965 Volume 20 Issue 12 Pages
2170-2179
Published: December 05, 1965
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Single crystal CuAu
3 alloy films were studied by electron diffraction and it was concluded that these alloys in general have a two-dimensional anti-phase domain structure of the Cu
3Pd type in the equilibrium ordered state, but the periodicity of the second type of domain boundary is indefinite. The mean saturation sizes of both types of domains increase with decreasing gold content, but the rate of increase of the second type domains seems to be greater than the first type, so that with decreasing gold content the structure tends to approximate to a one-dimensional structure with the first type domains.
High temperature experiments to observe the short range order scattering above the transition temperature indicated the presence of an anti-phase relationship of the same two-dimensional character as in the ordered state. This fact means the existence of long range correlations (>34Å) and necessitates some revision of the conventional concept of short range order in alloys.
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Minoru Sakiyama, Arata Kimoto, Syûzô Seki
1965 Volume 20 Issue 12 Pages
2180-2184
Published: December 05, 1965
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Phase transitions of ferroelectric NaNo
2 crystal around 164°C were studied by calorimetric and dilatometric methods. The values of both heat capacity and molar volume show an abrupt increase at about 163°C, indicating that this transition is of the first order. In the region of 164∼165°C, a small broad peak was observed in the
Cp−
T curve. On the other hand there appear two small anomalies in the volume expansion curve at 164.2°C and 164.7°C respectively. The total entropy of transition amounts to 1.26±0.08 e. u., which is nearly equal to
R1n2=1.377 e. u., and suggests that the orientational order of NO
2− ions is destroyed completely in the paraelectric phase.
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Takenari Goto, Takehisa Yashiro, Masayasu Ueta
1965 Volume 20 Issue 12 Pages
2185-2193
Published: December 05, 1965
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Resonance emission in CuI fiilms has been obtained for the exciton generated by the optical transition from the valence band having the symmetry
Γ8 of zinc blende structure. The Stokes shift in thick films amounts to 20Å. The shift has been found to depend much upon the film thickness. With preparing the thin film of the wedge shape, the variation of the Stokes shift has been measured as a function of the film thickness. The shift is found to show the decrease as the film thickness becomes thinner than 1.1 μ. In a very thin film, there is no Stokes shift. Discussions are given for the variation of the shift in connection to the exciton diffusion.
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Hiromichi Umebayashi, Yoshikazu Ishikawa
1965 Volume 20 Issue 12 Pages
2193-2202
Published: December 05, 1965
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The domain wall motion in a single crystal of a parasitic ferromagnet YFeO
3 was investigated. It was found by powder pattern method that a single domain wall exists in a parallelepiped specimen of the dimension 0.6×1.2×5.6 mm
3. The wall velocity was measured by driving the wall by a rectangular pulse fiield in a temperature range between 77°K and room temperature. At low driving fields, the velocity depends linearly upon the applied field. The order of magnitude of the damping parameter of the wall motion is almost the same as that of usual ferrimagnetic oxides. The damping parameter decreases monotonically with an increase of temperature.
It was observed that a pick-up signal at low temperatures rises with time with a constant slope. This peculiar phenomenon is explained by assuming that the wall is trapped by small defects and gets over the potential barriers by thermal activation under the influence of the applied field.
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Osamu Sueoka
1965 Volume 20 Issue 12 Pages
2203-2211
Published: December 05, 1965
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The plasma oscillation of electrons in Be, Mg, Al, Si, Ge, Sn, Sb and Bi has been studied using the method of energy analysis of electrons passed through thin foil of those solids. The energy loss value
ΔE, the dispersion relation,
i. e. the dependence of
ΔE on the scattering angle θ, the angular dependence of the intensity, the half breadth of
ΔE, and the cutoff scattering angle θ
c (corresponding to the cutoff wave number
kc) were measured by the photometric method. The angular distribution of the intensity does not agree with θ
−2 law given by Ferrell, but shows θ
−1.6∼−1.7 dependence. The curvature of
ΔE vs. θ curve for Be, Mg, Al and Si agree well with the theoretical values calculated by the free electron theory, but those for Ge, Sn and Sb are 20∼30% larger than the corresponding theoretical values, and that for Bi is twice as large as the latter. The half breadths of energy loss peak due to the plasma oscillation increase with increase in the scattering angle. Specimens of Ge were studied in the crystalline and in the amorphous states. The half breadth of energy loss peak of crystalline Ge is narrower than that of amorphous Ge, and the total cross section of the excitation of plasmon in both specimens are almost the same. The ratios of the total cross sections of the excitation of the plasmon in Al and in Be, and of that in Al and in Mg were measured.
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Osamu Sueoka
1965 Volume 20 Issue 12 Pages
2212-2225
Published: December 05, 1965
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The plasma oscillation of electrons in Al-Be, Al-Ge and Al-Sn eutectoids has been studied using the method of energy analysis of electrons passed through a thin foil of eutectoid. The energy of the plasma oscillation of electrons in eutectoid depends upon the grain sizes of component elements. In the case of Al-Be, two kinds of the plasma oscillation of Al and Be themselves are excited, if the grain sizes of Al and Be are more than several hundreds angstroms. On the other hand, if the grain sizes are less than about 60Å, only one plasma oscillation due to the bulk plasma oscillation is excited. For an intermediate grain size, two plasma oscillations with energy values each of which shift from that of Al or Be are observed. The grain size dependency of the plasma oscillation in eutectoid is explained phenomenologically. The energy loss value, the dispersion relation, the cutoff scattering angle, θ
c (corresponding to the cutoff wave number,
kc), the angular dependences of the intensity and the half breadth of energy loss peak of the plasma oscillation in small grain size eutectoid less than about 60Å were measured. Those values are compared with the corresponding theoretical values.
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Osamu Sueoka
1965 Volume 20 Issue 12 Pages
2226-2235
Published: December 05, 1965
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The characteristic energy losses of electrons passed through a thin foil of alkali halides, LiF, NaCl, KCl and KBr have been studied using the transmission technique. The differential cross section, the dispersion relation and the cutoff scattering angle of the strongest loss peak in a spectrum were measured. It is pointed out that the loss peak comes from the plasma oscillation of valence electrons. For the first loss peak due to the exciton, and for the 2nd (3rd for LiF) loss peak, the same sort of measurements are carried out. These measured values for the plasma oscillation were supported roughly by the free electron theory with 6 electrons per molecule taking part in the oscillation, and especially the value of the plasma energy agrees well with that by Horie’s theory. The loss peak located between the exciton and the plasma peak may be due to the tangential (surface) plasma oscillation. The ratio of the total cross section of these loss peaks to that of the loss peak due to the plasma oscillation were measured.
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Takehiko Oguchi
1965 Volume 20 Issue 12 Pages
2236-2243
Published: December 05, 1965
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Crystal field theory developed by Abragam and Pryce has been used to formulate the anisotropic exchange interactions in CoCl
2·2H
2O and CoBr
2·2H
2O. These crystals are antiferromagnets in which Co
++ ions form ferromagnetic linear chains coupling antiferromagnetically to adjacent chains. There are two abrupt jumps in the high-field magnetization in these crystals. These phenomena are explained quantitatively based on the model proposed by Oguchi and Takano and by Narath. The model, which involves several competing exchange interactions and the Zeeman energy, is reduced to the Ising model of a linear chain. Thus the problem is solved by the eigenvalue-method. The Néel point is obtained in terms of the anisotropic exchange parameters. In this way we estimate the numerical values of the exchange integrals. The frequencies of magnetic resonance absorption are also estimated.
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Hiroshi Watanabe, Yasuaki Nakagawa, Kiyoo Sato
1965 Volume 20 Issue 12 Pages
2244-2248
Published: December 05, 1965
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A powder neutron diffraction study has been made of Cr
2As with the spectrometers at the NRX and NRU reactors of Atomic Energy of Canada Ltd. Published magnetic and thermal data show this substance to be an antiferromagnetic with a Néel temperature of 393°K. Antiferromagnetic order along the
c axis has been established in the present study by the presence of the magnetic line (00(
Remark: Graphics omitted.)). The magnetic line (100) has been found to be present, which shows another type of antiferromagnetic order developed in the
c-plane. None of the antiferromagnetic spin structures which were tried in order to explain the observed peak intensities has been completely successful, but the most favorable is that in which Cr(
a) moments couple antiferromagnetically within the
c-plane.
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Osamu Sueoka
1965 Volume 20 Issue 12 Pages
2249-2252
Published: December 05, 1965
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The plasma oscillation of conduction electrons in Na has been studied by the energy analysis of electrons pass through the thin foil of Na. Results of the energy, the dispersion relation and the cutoff scattering angle of the plasma oscillation agree well with the calculated values based on the free electron theory. Result of the differential cross section does not agree with the free electron theory, as is in the case of Al.
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Tadashi Sugawara
1965 Volume 20 Issue 12 Pages
2252-2259
Published: December 05, 1965
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The resistivity of the dilute alloys of rare earth metals with yttrium has been measured at low temperatures. The result is in qualitative agreement with the recent theories due to Kondo and others on the
s–
d or
s–
f scattering. The effective
s–
f exchange integrals for various rare-earth solutes have been derived from the analysis of the resistivity data and compared with the reported values in other matrices. The integral for Ce is negative, leading to a resistance minimum, while those for heavier rare earths are positive. The sign of the integral has been discussed in terms of the mixing of conduction electrons with localized 4
f electrons. The increase of the residual resistivity due to added rare earths depends upon the number of 4
f electrons of the solute in a complicated way and is anomalously large for lighter rare earths such as La, Ce, and Pr.
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R. A. Bonham
1965 Volume 20 Issue 12 Pages
2260-2262
Published: December 05, 1965
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Fourier transform techniques are utilized to simplify the two center integrals encountered in the calculation of molecular and x-ray scattering factors in the first Born approximation. It is shown that the two center integrals can be reduced to a single numerical integration from 0 to 1 for a molecule in a fixed or random orientation in space. The many-electron wave function is taken as a product of hydrogen-like orbitals with arbitrary screening parameters. Explicit expressions for certain cases involving 1
s, 2
s and 2
pz orbitals are given.
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Yoshiro Kainuma
1965 Volume 20 Issue 12 Pages
2263-2271
Published: December 05, 1965
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This theory deals with a single process of inelastic scattering. It is shown that the superposition of spherical inelastic waves scattered in a thin layer within a crystal forms waves expressed by Bloch functions and the superposition of the inelastic waves scattered in various depths in the crystal forms the inelastic waves observed in vacuum.
The result of the present theory agrees with the results of theories by Fujimoto and Kainuma (J. Phys. Soc. Japan
18 (1963) 1792), Laue (Matriewellen und ihre Interferenzen (1948) 355), Kainuma (Acta cryst.
8 (1955) 247), and Fukuhara (J. Phys. Soc. Japan
18 (1963) 496). Fukuhara’s theory is rewritten in a form convenient for the comparison with the result of the present theory.
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Hiroki Nakamura
1965 Volume 20 Issue 12 Pages
2272-2278
Published: December 05, 1965
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The cross sections for the excitation transfer between unlike atoms are calculated by the impact parameter method. Approximate formulas for discrete-continuum and discrete-discrete transition probabilities are obtained. The cross section can be obtained by integrating this probability over the impact parameter. The approximate formula is applied to the case of Deuterium-Hydrogen excitation transfer as one of practical examples. Comparisons are made with two other formulas,
i. e. Rosen-Zener (R-Z) and Vanishtein-Presnyakov-Sobelman (V-P-S) formulas. The dependence of the cross section on the resonance defect in the discrete-discrete case is also investigated. The agreements among these three formulas are found not very good.
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Ayao Amemiya
1965 Volume 20 Issue 12 Pages
2279-2288
Published: December 05, 1965
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Integro-differential equations for crosslinking of polymers when several modes of crosslinking considered are established. Change of average degree of polymerisation with time (or dose) is obtained for arbitrary initial molecular size distribution. Special cases are discussed. Coincidence of gel points of average degree of polymerisation is verified.
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Toshiyuki Yamada
1965 Volume 20 Issue 12 Pages
2289
Published: December 05, 1965
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R. Vijayaraghavan, V. Saraswati
1965 Volume 20 Issue 12 Pages
2290
Published: December 05, 1965
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Keita Yamamoto
1965 Volume 20 Issue 12 Pages
2291
Published: December 05, 1965
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Isamu Akasaki, Tohru Hara
1965 Volume 20 Issue 12 Pages
2292
Published: December 05, 1965
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Wataru Sasaki
1965 Volume 20 Issue 12 Pages
2293
Published: December 05, 1965
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Kumao Hisano, Nobuhiko Ohama, On Matumura
1965 Volume 20 Issue 12 Pages
2294
Published: December 05, 1965
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Yoshihiko H. Ohtsuki, Sadaaki Yanagawa
1965 Volume 20 Issue 12 Pages
2295
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Shinji Ogawa
1965 Volume 20 Issue 12 Pages
2296
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Kazuo Takayanagi
1965 Volume 20 Issue 12 Pages
2297
Published: December 05, 1965
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Toshitaka Idehara, Haruhiko Abe, Hiroshi Kubo
1965 Volume 20 Issue 12 Pages
2298
Published: December 05, 1965
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Ichiroh Nakada, Keiko Oyama
1965 Volume 20 Issue 12 Pages
2299
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Ojiro Nagai
1965 Volume 20 Issue 12 Pages
2300
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Shinji Shiobara
1965 Volume 20 Issue 12 Pages
2301
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Yoshio Shibuya, Takafumi Aomine
1965 Volume 20 Issue 12 Pages
2302
Published: December 05, 1965
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C. Ramasastry, S. B. S. Sastry
1965 Volume 20 Issue 12 Pages
2303
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Yoshiki Sato
1965 Volume 20 Issue 12 Pages
2304-2305
Published: December 05, 1965
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Hiroshi Kanzaki, Keishiro Kido, Shohei Tamura, Shohachiro Ôki
1965 Volume 20 Issue 12 Pages
2305-2306
Published: December 05, 1965
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Tadaichi Yabumoto, Hiroshi Sugimoto, Nobuo Muto
1965 Volume 20 Issue 12 Pages
2306-2307
Published: December 05, 1965
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Mikiko Hagi, Akira Hirose, Hiroshi Tanaca
1965 Volume 20 Issue 12 Pages
2307-2308
Published: December 05, 1965
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Kiyoe Kato, Satoru Kiyama, Hiroko Shimahara
1965 Volume 20 Issue 12 Pages
2308-2309
Published: December 05, 1965
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Kuniya Fukuda, Keishi Ishii, Rei Okasaka, Takashi Fujimoto
1965 Volume 20 Issue 12 Pages
2309-2310
Published: December 05, 1965
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Sadao Nakai, Chiyoe Yamanaka
1965 Volume 20 Issue 12 Pages
2310-2311
Published: December 05, 1965
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Takashi Kushida, Pravin Parikh
1965 Volume 20 Issue 12 Pages
2312-2313
Published: December 05, 1965
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V. Saraswati, S. Jagannathan
1965 Volume 20 Issue 12 Pages
2313-2314
Published: December 05, 1965
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Hiroshi Yada, Shigeru Kiritani
1965 Volume 20 Issue 12 Pages
2314-2315
Published: December 05, 1965
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Yuzi Okuto, Nobuo Kawamura
1965 Volume 20 Issue 12 Pages
2315-2316
Published: December 05, 1965
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