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Volume 18, Issue 10
Displaying 1-35 of 35 articles from this issue
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Kazuo Sato1963 Volume 18 Issue 10 Pages 1353-1357
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPhotoneutron cross sections in Na23 and Si28 were measured using BF3 proportional counters. In the case of Na23, 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 Na23 (γ, n) Na22 yield curve. In the case of Si28, 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.View full abstractDownload PDF (648K) -
Takeki Iwashita, Takashi Inamura, Yoshio Ikemoto, Seizaburo Kageyama1963 Volume 18 Issue 10 Pages 1358-1365
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLevel structure of Pr144 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.View full abstractDownload PDF (992K) -
Ryoichi Kajikawa1963 Volume 18 Issue 10 Pages 1365-1373
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy 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.View full abstractDownload PDF (952K) -
Yoshitaka Furukawa1963 Volume 18 Issue 10 Pages 1374-1382
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (1076K) -
Ikuji Tsujikawa, Eizo Kanda1963 Volume 18 Issue 10 Pages 1382-1390
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTwo strong absorption lines of MnCl2·4H2O and MnBr2·4H2O 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.View full abstractDownload PDF (1356K) -
Ikuji Tsujikawa1963 Volume 18 Issue 10 Pages 1391-1399
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Zeeman effect and the dilution effect of absorption lines in the violet region of MnSiF6·6H2O 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 6A1 to the excited states 4E and 4A1, 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.View full abstractDownload PDF (1208K) -
Hisashi Abe, Motohiro Matsuura, Hiroshi Yasuoka, Akira Hirai, Tsuneo H ...1963 Volume 18 Issue 10 Pages 1400-1406
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe nuclear magnetic resonance (NMR) of Fe57 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 Fe57 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.View full abstractDownload PDF (880K) -
Ikuji Tsujikawa1963 Volume 18 Issue 10 Pages 1407-1412
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFive sharp absorption lines of Mn(CH3COO)2·4H2O 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 6A1 to the excited states 4A1 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.View full abstractDownload PDF (828K) -
Yuh Fukai1963 Volume 18 Issue 10 Pages 1413-1421
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDisplacements 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.View full abstractDownload PDF (1208K) -
Takenari Goto, Takehiko Ishii, Masayasu Ueta1963 Volume 18 Issue 10 Pages 1422-1429
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTemperature 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.View full abstractDownload PDF (1004K) -
Kazuo Kanematsu, K\={o} Yasuk\={o}chi, Tetuo Ohoyama1963 Volume 18 Issue 10 Pages 1429-1436
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffects of substitution of Fe and Ni or Co in the Pauli-paramagnetic compounds Co1.67Ge and Ni1.67Ge were investigated on (Fe, Co)1.67Ge and (Fe, Ni)1.67Ge. Substitution of Fe for Co in Co1.67Ge increases the paramagnetic moment np and decreases the Pauli part of susceptibility χ0.
This suggests polarization of Co neighboring to Fe. Contribution of Co is seen in ferromagnetic moment nf. Fe dissolved into Ni1.67Ge increases χ0 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 χ0 fall off and np grow rapidly. Thereafter nf appears and increases.View full abstractDownload PDF (1004K) -
Akira Morita1963 Volume 18 Issue 10 Pages 1437-1441
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (540K) -
Masahiro Mizushima1963 Volume 18 Issue 10 Pages 1441-1448
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA Richter-type peak of magnetic loss and the disaccommodation were observed for cobalt-substituted Ni-Zn ferrites containing Fe2O3 less than the stoichiometric composition. These phenomena can be interpreted in terms of the diffusion of electrons between Co2+ ions and Co3+ ions. The induced anisotropy caused by the preferential occupation of Co3+ 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.View full abstractDownload PDF (924K) -
Kiyoshi Aoyagi, Akira Misu, Satoru Sugano1963 Volume 18 Issue 10 Pages 1448-1459
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (1604K) -
Takehiko Ishii, Masayasu Ueta1963 Volume 18 Issue 10 Pages 1460-1465
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (764K) -
Atsuko Ito, Kazuo Ôno, Yoshikazu Ishikawa1963 Volume 18 Issue 10 Pages 1465-1473
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA 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.View full abstractDownload PDF (1048K) -
Michio Matsuzawa1963 Volume 18 Issue 10 Pages 1473-1476
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffective 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.View full abstractDownload PDF (388K) -
Eiji Nakamura, Toshio Mitsui, Jiro Furuichi1963 Volume 18 Issue 10 Pages 1477-1481
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt 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.View full abstractDownload PDF (536K) -
Yoshio Nakai, Takatoshi Murata, Kaizo Nakamura1963 Volume 18 Issue 10 Pages 1481-1485
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (564K) -
Kanji Katsuura, Mitio Inokuti1963 Volume 18 Issue 10 Pages 1486-1494
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA 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.View full abstractDownload PDF (1032K) -
Sigeo Yomosa1963 Volume 18 Issue 10 Pages 1494-1498
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFollowing 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 1.2×107 cm/sec. and 3.2×102 cm/sec., respectively.View full abstractDownload PDF (448K) -
Yukikazu Itikawa1963 Volume 18 Issue 10 Pages 1499-1507
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (708K) -
Masumi Sato, Yoshisuke Hatta1963 Volume 18 Issue 10 Pages 1507-1514
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDiffusion 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.View full abstractDownload PDF (936K) -
Yaso’o Matunobu1963 Volume 18 Issue 10 Pages 1515-1525
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSApplicability 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.View full abstractDownload PDF (976K) -
Otohiko Nomoto1963 Volume 18 Issue 10 Pages 1526-1550
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe intermolecular potential energy per mole in liquid state, −Ep, and the value of the constant of intermolecular potential, εm, 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.View full abstractDownload PDF (2552K) -
R. Bösch, J. Lang, R. Müller, Wölfli1963 Volume 18 Issue 10 Pages 1551
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Tetsui Yanagi1963 Volume 18 Issue 10 Pages 1552-1553
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Shoji Kojima, Takaya Kawabe, Kiyoe Kato, Kiyoshi Ogawa1963 Volume 18 Issue 10 Pages 1553-1554
Published: October 05, 1963
Released on J-STAGE: June 01, 2007
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Hiroshi Yasuoka, Hisashi Abe, Motohiro Matsuura, Akira Hirai1963 Volume 18 Issue 10 Pages 1554-1555
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Koichi Sugiyama1963 Volume 18 Issue 10 Pages 1555-1556
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Shigeru Ando1963 Volume 18 Issue 10 Pages 1556-1557
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Eiso Yamaka1963 Volume 18 Issue 10 Pages 1557-1558
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Kazuo Morigaki1963 Volume 18 Issue 10 Pages 1558-1559
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Tsuyoshi Ohnishi, Hiroe Kawamura1963 Volume 18 Issue 10 Pages 1559-1560
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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Junkichi Itoh, Takesi Takeda1963 Volume 18 Issue 10 Pages 1560-1561
Published: October 05, 1963
Released on J-STAGE: May 29, 2007
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