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Kazuo Sato
1963 年 18 巻 10 号 p.
1353-1357
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
Photoneutron cross sections in Na
23 and Si
28 were measured using BF
3 proportional counters. In the case of Na
23, the cross section shows a rather sharp resonance at the energy of 14.4 Mev and there is evidence in favor of giant resonance splitting. The breaks are observed at 13.1, 14.2, and 15.3 Mev in the Na
23 (γ,
n) Na
22 yield curve. In the case of Si
28, the cross section seems to consist of two peaks in the vicinity of 20 Mev, but as a result of the poor statistics, the detailed shape of the cross section is uncertain.
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Takeki Iwashita, Takashi Inamura, Yoshio Ikemoto, Seizaburo Kageyama
1963 年 18 巻 10 号 p.
1358-1365
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
Level structure of Pr
144 was investigated by gamma-gamma coincidence measurements and the spins of the levels were determined using the gamma-gamma directional correlation method. The 166 keV level proposed by Freeman has been confirmed. A new 92 keV gamma ray coincident with the 41 keV gamma ray has been found. A decay scheme containing the new level is proposed. Interpretations of the levels are discussed in terms of the shell model.
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Ryoichi Kajikawa
1963 年 18 巻 10 号 p.
1365-1373
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
By making use of “glass-metal” spark chambers, observations are made for the total number of electrons, the longitudinal and lateral distributions and the fluctuations in electron numbers in electron-photon showers developing in lead absorbers. The measurements are made at five electron energies between 200 and 550 MeV.
The results are in essential agreement with the Monte Carlo calculation by Messel et al. for primary electron energies of 400–500 MeV.
With the present detection system, the electron energy for a single shower can be determined with the uncertainty of 30% by counting the total number of sparks. A relation between the number of electrons and the primary electron energy is observed as linear as predicted by low-energy shower theories. Thus for energies up to 550 MeV, no appreciable change in the multiple track efficiency of the chamber is observed.
The present results also show that the “glass-metal” spark chamber has a high multiple track efficiency, and the shower detector composed of such chambers is found to be very useful in shower observation.
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Yoshitaka Furukawa
1963 年 18 巻 10 号 p.
1374-1382
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
The anomalous magnetoresistance and planar Hall effect of heavily doped
n- and
p-type germanium have been measured at 4.2°K. The magnetoresistance consists of two components,
i.e., the ordinary and extraordinary components. It turned out that these components satisfy Seitz’s formula under the weak field condition, and the upper limit of weak field range is entirely different between them. Some of the character of these components are presented.
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Ikuji Tsujikawa, Eizo Kanda
1963 年 18 巻 10 号 p.
1382-1390
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
Two strong absorption lines of MnCl
2·4H
2O and MnBr
2·4H
2O in the violet region were investigated between 20°K and 1.2°K, for the purpose of studying the ordered state spectroscopically. The abrupt changes of wave numbers and relative intensities of these lines were observed between just above and just below the Néel temperatures, which could be interpreted qualitatively on the basis of the molecular field theory. The changes of polarization of these lines with the magnetic field were also observed, and were attributed to the changes of the magnetic states. It could be concluded that the preferred axis is the
c axis and that the spin flopping takes place for both salts.
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Ikuji Tsujikawa
1963 年 18 巻 10 号 p.
1391-1399
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
The Zeeman effect and the dilution effect of absorption lines in the violet region of MnSiF
6·6H
2O were measured at low temperatures between 20°K and 1.2°K with a spectrograph with 2.6Å/
mm dispersion in order to complete the analysis of the spectra. The properties of the excited state for sharp quartet lines between 24,918 cm
−1 and 24,953 cm
−1 became clear in some detail. The singlet line at 25,043 cm
−1 which was isotropic in the absence of a field became anisotropic when a magnetic field was applied. These anisotropies may be explained assuming magnetic dipole transitions. As a result, it is concluded that the quartet lines and the singlet line correspond to transitions from the ground state
6A
1 to the excited states
4E and
4A
1, respectively. Assuming the frequencies of the three odd ligand vibrations, the other broad lines in the shorter wave length region can well be interpreted as the transition coupled with these vibrations. An observation of the shifts of the quartet lines and the singlet line due to dilution is useful for the assignment of these lines.
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Hisashi Abe, Motohiro Matsuura, Hiroshi Yasuoka, Akira Hirai, Tsuneo H ...
1963 年 18 巻 10 号 p.
1400-1406
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
The nuclear magnetic resonance (NMR) of Fe
57 in Ni- and Ni-Zn-ferrites at zero external field was observed by using a pulsed NMR method. The resonance line-widths were too broad to be detected by the steady-state method.
In Ni-ferrite, two resonance lines corresponding to Fe
+3 ions at tetrahedral site and at octahedral site were separately observed. At room temperature, the center frequencies of the resonance lines were 67.6 Mc/sec and 72.0 Mc/sec, and their widths were 1.7 Mc/sec and 2.0 Mc/sec, respectively. Temperature dependences were also studied.
The effects of substitution of Zn for Ni on NMR of Fe
57 in Ni-ferrite were studied. The NMR signals could be observed up to 30% substitution of Zn at room temperature and up to 50% at liquid air temperature. By substituting Zn for Ni, the resonance line corresponding to octahedral site becomes broader and shifts to the lower frequency side, while that corresponding to tetrahedral site is affected very little.
Mössbauer studies were also carried out to check some of the experimental results and discussions.
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Ikuji Tsujikawa
1963 年 18 巻 10 号 p.
1407-1412
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
Five sharp absorption lines of Mn(CH
3COO)
2·4H
2O were found in the violet region at liquid helium temperature. The line at 24,496 cm
−1 and the quartet lines between 24,695 cm
−1 and 24,770 cm
−1 were assigned to the transitions from the ground state
6A
1 to the excited states
4A
1 and
4E respectively. These transitions are caused by an electric dipole. The magnetic field dependence of relative intensities of these lines at 1.3°K was investigated, and it was concluded that the ordered state below 3.18°K is ferrimagnetic, that the preferred axis is the
a axis and that the most difficult axis is the
b axis. The results of susceptibility measurements and electron spin resonance were consistent with the present conclusion.
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Yuh Fukai
1963 年 18 巻 10 号 p.
1413-1421
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
Displacements of nearest-neighbor ions around various substitutional impurities in alkali halide crystals are calculated by the isotropic approximation and by the superlattice approximation using the repulsive potentials of Born type and Born-Verwey type. Results of these calculation agree with each other within the error of ±20%.
Lattice parameter change due to solute ions, also calculated by these methods, are compared with available experimental data. Theoretical estimates of lattice parameter changes are found to be larger than experimental values.
Possible ambiguities involved in these theories are examined, and it is concluded that Eshelby’s theory of lattice parameter change is reliable within the error of about ±20%, provided the effect of core relaxation and anisotropy of distortion is properly taken into account.
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Takenari Goto, Takehiko Ishii, Masayasu Ueta
1963 年 18 巻 10 号 p.
1422-1429
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
Temperature dependence and spectral distribution of photoconductivity in the ultraviolet region of KCl, KBr and NaCl crystals containing
U centers have been investigated in the temperature range between room and liquid nitrogen temperatures. The optical absorption spectra of these crystals have also been measured. Two absorption bands are resolved in the shorter wavelength tail of the
U band and they are attributed to the transitions to higher excited states of the
U center. The spectral distribution of photoconductivity shows maxima at these band peaks. The nature of photocurrent is primary at the temperature range of 190°K–110°K for KCl, 170°K–100°K for KBr and 170°K–90°K for NaCl crystals, respectively, and above and below these temperature ranges the secondary photocurrent appears. The energy gaps between the conduction band and higher excited states of the
U center are determined.
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Kazuo Kanematsu, K\={o} Yasuk\={o}chi, Tetuo Ohoyama
1963 年 18 巻 10 号 p.
1429-1436
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
Effects of substitution of Fe and Ni or Co in the Pauli-paramagnetic compounds Co
1.67Ge and Ni
1.67Ge were investigated on (Fe, Co)
1.67Ge and (Fe, Ni)
1.67Ge. Substitution of Fe for Co in Co
1.67Ge increases the paramagnetic moment
np and decreases the Pauli part of susceptibility χ
0.
This suggests polarization of Co neighboring to Fe. Contribution of Co is seen in ferromagnetic moment
nf. Fe dissolved into Ni
1.67Ge increases χ
0 while
np remains nearly zero. This suggests that Fe loses the magnetic moment and contributes also to the Pauli paramagnetism. With increasing of Fe, it polarizes, making χ
0 fall off and
np grow rapidly. Thereafter
nf appears and increases.
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Akira Morita
1963 年 18 巻 10 号 p.
1437-1441
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
The many-body theory of impurity states developed in a previous paper is extended so as to include ionic polarizations in polar crystals. It is shown that the impurity potential is screened by the usual static dielectric constant at a great distance from the charged impurity center. However, the screening effects due to both electronic and ionic polarizations become ineffective rather rapidly at a distance equal to or less than the lattice constant from the impurity center. This result is used to explain the behavior of the electron mobility in PbTe at liquid helium temperature satisfactorily.
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Masahiro Mizushima
1963 年 18 巻 10 号 p.
1441-1448
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
A Richter-type peak of magnetic loss and the disaccommodation were observed for cobalt-substituted Ni-Zn ferrites containing Fe
2O
3 less than the stoichiometric composition. These phenomena can be interpreted in terms of the diffusion of electrons between Co
2+ ions and Co
3+ ions. The induced anisotropy caused by the preferential occupation of Co
3+ ions in four kinds of 16d sites may explain these phenomena. Relaxation times are represented by the equation τ=τ
∞exp (
Q⁄
kT), where τ
∞ are approximately 10
−17 to 10
−15 sec for the Richter-type peak and 10
−10 to 10
−11 sec for the disaccommodation. Activation energies are about 0.8 to 1.0 eV for the former, and about 0.5 to 0.7 eV for the latter.
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Kiyoshi Aoyagi, Akira Misu, Satoru Sugano
1963 年 18 巻 10 号 p.
1448-1459
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
The Zeeman effect of the
B and
R absorption lines of ruby was observed photographically with strong pulsed magnetic fields up to 230 kOe at 77°K. This was achieved by flashing a Xe-lamp at the time when a magnetic field reached its peak. The duration of the pulsed field was made to be about 1 m sec which was much longer than that of the pulsed light, about 20 μsec. The
g-values of the excited states responsible for the
B and
R lines were measured and the comparison was made with those reported by other authors. For the Zeeman patterns of the
R lines with magnetic fields perpendicular to the optic axis, the Paschen-Back effect was calculated and compared with the observed patterns.
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Takehiko Ishii, Masayasu Ueta
1963 年 18 巻 10 号 p.
1460-1465
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
The spectral distribution of photoconductivity has been investigated at liquid nitrogen and liquid helium temperatures both on additively colored and X-rayed CsBr. A peak is always found on the long wavelength side of the
F band in the spectral distribution curve of ηω. Absorption bands which are located at 400 and 490 mμ at liquid nitrogen temperature are found to occur only when
F centers are present. Absorption of photons in these bands gives rise to photocurrents. The two bands are interpreted as those like the
L bands in NaCl-type alkali halides. At liquid helium temperature, fine structure is resolved in the region below 600 mμ. A band, which is photoconductive, is developed on the long wavelength side of the
F band by optical bleaching of the
F band at liquid nitrongen temperature.
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Atsuko Ito, Kazuo Ôno, Yoshikazu Ishikawa
1963 年 18 巻 10 号 p.
1465-1473
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
A study of the low temperature transition in magnetite has been performed by the Mössbauer absorption using both an isotopic enriched sample and a single crystal. At room temperature two different hyperfine fields 495±20 kOe and 470±20 kOe were observed, and their intensity ratio was about one to two. Below the transition temperature, hyperfine fields of 510±20 kOe and 470
−20+30 kOe were observed and their intensity ratio was about two to one providing the ferric and ferrous ions in octahedral sites to be separately ordered. An electric quadrupole interaction and an isomer shift for the ferrous ions were carefully measured as −1.9±0.2 mm/sec and 0.88±0.15 mm/sec, respectively, at 85°K. These values are a little smaller than those in the ordinary ferrous compounds. A weak peak was observed, which could not be identified.
A temperature dependence of the absorption spectra was also observed in the transition region. It is suggested that two phenomena described in the paper are superposed in this temperature region.
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Michio Matsuzawa
1963 年 18 巻 10 号 p.
1473-1476
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
Effective cross-sections averaged over all directions of an incident electron are calculated for the excitations to the lower excited levels of π electrons in benzene by means of Born’s approximation with the aid of the simple free electron model for π electrons.
Results of calculation show that π electrons in benzene are quite easily excited to the lowest group of excited levels by electrons.
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Eiji Nakamura, Toshio Mitsui, Jiro Furuichi
1963 年 18 巻 10 号 p.
1477-1481
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
It has been tried to classify newly discovered ferroelectrics as well as old ones according to their Curie-Weiss constants. Results have suggested that the displacive type ferroelectrics are not necessarily oxide crystals, and have also shown that small Curie-Weiss constants are not very rare in new ferroelectrics. Classification of ferroelectrics by the transition entropy is misleading in some cases.
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Yoshio Nakai, Takatoshi Murata, Kaizo Nakamura
1963 年 18 巻 10 号 p.
1481-1485
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
The effects of foreign alkali metal ions on the exciton absorption in some alkali chlorides have been investigated. The mixed systems of KCl-RbCl and KCl-NaCl were chosen as characteristic examples. In KCl-RbCl, positions of the exciton peaks shift fairly linearly with the change of relative concentrations of the constituents, and the ‘chlorine doublet’ keeps its structure throughout the full range of concentration. In KCl-NaCl, only the long-wavelength shift of the exciton absorption occurs and the doublet structure undergoes a marked deformation. The results are compared with the X-ray analysis of the mixed samples.
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Kanji Katsuura, Mitio Inokuti
1963 年 18 巻 10 号 p.
1486-1494
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
A one-dimensional model of coupled molecules containing an impurity is proposed and properties of its excited states are examined for the purpose of understanding excitation energy localization and delocalization in radiation chemistry. The model consists of a linear array of equally spaced identical molecules and an impurity molecule and is characterized by Coulomb and resonance integrals,
viz., matrix elements of the Hamiltonian of the total system between the wave functions corresponding to localized excitation. The eigen energies of the excited states of this model are shown to form a band with a particular level separated downward from the bottom and/or another one upwards from the top of the band. Another model containing a displaced molecule in a chain of otherwise equally spaced identical molecules is also studied and shown to possess the same type of level scheme. The separation of the bottom or the top level from the band edge is calculated for particular cases where the coupling between the wave functions corresponding to localized excitation is of dipole-dipole or quadrupole-quadrupole type. Implications of the results to radiation chemistry are discussed.
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Sigeo Yomosa
1963 年 18 巻 10 号 p.
1494-1498
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
Following Frenkel-Peierls method, the electronic state of an exciton created in a set of peptide groups repeated by hydrogen bonds, —OCNH—OCNH—OCNH—, is studied. Referring to the Magee’s treatment, the spreading velocity of the exciton along the linear set of peptide groups is determined. The spreading velocities of singlet and triplet exciton are estimated as about 1.2×10
7 cm/sec. and 3.2×10
2 cm/sec., respectively.
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Yukikazu Itikawa
1963 年 18 巻 10 号 p.
1499-1507
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
The electrical and the thermal conductivities, and the viscosity coefficient of plasmas are calculated in the unified theory without any cut-off procedure. They are valid not only for large values of the Coulomb logarithms themselves but also for large values of their arguments. The effect of a magnetic field is not considered.
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Masumi Sato, Yoshisuke Hatta
1963 年 18 巻 10 号 p.
1507-1514
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
Diffusion rate of a plasma across a magnetic field lower than the critical field for screw instability is measured and is compared with Simon’s diffusion theory which states that the diffusion of the plasma across the longitudinal magnetic field is not ambipolar in short discharge tubes.
Mathematical treatment of the plasma state equation shows that the short circuit path to neutralize space charge pointed by Simon can not be made up in the plasma.
A new measuring method by means of the voltage-current relation of the discharge tube in the magnetic field is introduced to determine the diffusion rate across the magnetic field quantitatively.
According to the present investigations, there is no diffusion mechanism due to so called “short circuit effect,” and the diffusion is ambipolar independent of the tube dimension.
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Yaso’o Matunobu
1963 年 18 巻 10 号 p.
1515-1525
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
Applicability of the thin-aerofoil theory to the stagnation flow is examined. As a typical example, the two-dimensional subsonic flow of an inviscid fluid past a parabolic cylinder at zero incidence is considered. Calculation is performed up to the fourth approximation by means of the thin-wing-expansion method. The results show that, if the whole terms involved are completely taken into account at each step of approximation, the iterative calculations based on the assumption of small disturbance are useful even for the study of the stagnation flow, but that convergent solutions can possibly be obtained only for free-stream Mach numbers smaller than 0.4. The results are also compared with those by means of the
M2-expansion method.
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Otohiko Nomoto
1963 年 18 巻 10 号 p.
1526-1550
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
The intermolecular potential energy per mole in liquid state, −
Ep, and the value of the constant of intermolecular potential, ε
m, are calculated in terms of the sound velocity, thermal expansion coefficient, and the specific heat at constant pressure. The calculation is performed on the basis of a thermodynamical treatment using the cell-model theory. The absolute value, −
Ep, has been shown to be approximately equal to the heat of vaporization per mole minus the work done due to the volume change during the evaporation process,
L−
RT,
R being the gas constant, for most of organic and inorganic liquids. For associated liquids such as alcohols,
L−
RT is larger than −
Ep computed in the same manner. This difference seems to give an insight of the state of association. In molten metals the van der Waals contribution −
Ep is far smaller than
L−
RT. This fact shows an overwhelming contribution of the metallic binding.
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R. Bösch, J. Lang, R. Müller, Wölfli
1963 年 18 巻 10 号 p.
1551
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Tetsui Yanagi
1963 年 18 巻 10 号 p.
1552-1553
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Shoji Kojima, Takaya Kawabe, Kiyoe Kato, Kiyoshi Ogawa
1963 年 18 巻 10 号 p.
1553-1554
発行日: 1963/10/05
公開日: 2007/06/01
ジャーナル
認証あり
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Hiroshi Yasuoka, Hisashi Abe, Motohiro Matsuura, Akira Hirai
1963 年 18 巻 10 号 p.
1554-1555
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Koichi Sugiyama
1963 年 18 巻 10 号 p.
1555-1556
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Shigeru Ando
1963 年 18 巻 10 号 p.
1556-1557
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Eiso Yamaka
1963 年 18 巻 10 号 p.
1557-1558
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Kazuo Morigaki
1963 年 18 巻 10 号 p.
1558-1559
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Tsuyoshi Ohnishi, Hiroe Kawamura
1963 年 18 巻 10 号 p.
1559-1560
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり
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Junkichi Itoh, Takesi Takeda
1963 年 18 巻 10 号 p.
1560-1561
発行日: 1963/10/05
公開日: 2007/05/29
ジャーナル
認証あり