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Kunio Nagatani
1960 年 15 巻 1 号 p.
1-2
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
Beta- and gamma-rays from 18-min Ba
141 were investigated using scintillation spectrometers. Ba
141 was made from photofission of natural uranium. The end-point energy of the beta-ray was determined to be 2.8-MeV and the gamma-rays of energies 0.125, 0.19, 0.28, 0.37, 0.46 and 0.61-MeV, respectively, were observed.
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Mitsuhiro Kawamura
1960 年 15 巻 1 号 p.
3-8
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
The directional correlation and the polarization direction correlation of the 722 Kev-556 Kev gamma-gamma cascade in Cd
114 have been measured. It is found that the decay sequence of this cascade agrees well with the 4(E2)2(E2)0 sequence. The ratio of the rate of the positron decay to that of the cascade decay is also obtained as 3×10
−3.
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Seishi Kikuchi, Junpei Sanada, Shigeki Suwa, Izuo Hayashi, Keigo Nisim ...
1960 年 15 巻 1 号 p.
9-17
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
The differential cross sections for the elastic scattering of 13.93 MeV protons by deuterons were measured with accuracy varying from 1 to 3% at angles from 12° to 164° in the center-of-mass system. A shallow Coulomb-nuclear interference minimum near 17° was observed. The angular distribution is in good agreement with that of neutrons scattered by deuterons at 14 MeV, although the
p–
d cross sections seem systematically a little smaller than the
n–
d cross sections at backward angles. For forward angles, the experimental results contradict with the prediction of the existing theory. The small-angle
p–
d elastic scattering at 10.14 MeV was also investigated and a similar shallow Coulomb-nuclear interference was observed, in contrast with the theoretical curve of Christian and Gammel.
The
p–
p scattering experiment at 14.16 MeV is also described. Measurements were made with accuracy of 1 to 2% for angles from 30° to 114° in the center-of-mass system.
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Jiro Muto
1960 年 15 巻 1 号 p.
17-27
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
The Mg
25(
p, γ)Al
26 reaction was studied at the three resonances of 317, 392 and 437 kev proton energy. The level of Al
26, corresponding to the third excited state (3.97 Mev) in Mg
26, was found at 4.18±0.02 Mev. Through the angular distributions of γ-rays, spins and parities of this level and some other levels were assigned as follows: 3.16 Mev,
J=2
+; 4.18 Mev,
J=3
+; 6.61 Mev,
J=3
−; 6.68 Mev,
J=2
+ or 3
+; 6.72 Mev,
J=4
+ or 4
−. The second and third excited states in Mg
26 were estimated to be
J=2
+ and
J=3
+ respectively. Excitation energies, the gamma decay scheme, and the radiation yield of the resonance levels are also given. The correspondence between levels of Mg
26 and Al
26 is discussed and a possible excited state configuration of Mg
26 is suggested.
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Kotoyuki Okano
1960 年 15 巻 1 号 p.
28-41
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
Gamma-rays from the reaction Al
27 (
p, γ)Si
28 have been studied at the four resonances occurring at E
p=226, 294, 326, and 405 kev by the use of a large NaI crystal scintillation spectrometer. The gamma-ray transitions from the resonance states to the levels in Si
28 at 1.78 Mev(1st), 4.62 Mev(2nd), 6.91 Mev, and 8.58 Mev were observed. Spins and parities of these levels and some of the resonance levels are deduced from the anisotropies of gamma-rays as follows: 4.62 Mev,
J=4
(+); 6.91 Mev,
J=2
± or 4
+; 8.58 Mev,
J=3
+; 11.90 Mev,
J=4
(−); 11.98 Mev,
J=4
−.
J=4
(+) for the second excited state suggests the collective nature of this excited
v level which has been expected from the other evidences found in neighbouring nuclei. The gamma-ray yield and the branching ratios of each resonance level are also given.
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Seishi Kikuchi, Itaru Nonaka, Hiroshi Ikeda, Hiroo Kumagai, Yoshio Saj ...
1960 年 15 巻 1 号 p.
41-59
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
A 160 cm cyclotron have been constructed as the first accelerator of the Institute for Nuclear Study, University of Tokyo. This cyclotron can be used as a variable energy ordinary cyclotron as well as a synchro-cyclotron by changing the dee-system and the oscillator system.
As an ordinary cyclotron it can produce protons of any desired energy between 7.5 and 15 MeV, deuterons between 15 and 21 MeV, and α particles between 30 and 42 Mev. These beams are now being used for various experiments on nuclear reactions and for production of radioisotopes.
As a synchro-cyclotron, it can produce protons of 57 MeV in energy and the beam is extracted with high efficiency at a radius near
n=1 with an electrostatic deflector.
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Terutosi Murakami
1960 年 15 巻 1 号 p.
60-69
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
The variation principle in the kinetic theory of gases is extended to the case of a dense gas made of rigid-sphere molecules with the finite radius. The solution of Enskog’s first approximation equation for the dense gas of rigid-sphere molecules is derived from the variation principle. The local entropy production per unit time is the maximum in this variational principle. The correction to the entropy due to imperfectness of the gas is calculated from the virial expansion of the equation of state for a rigid-sphere gas.
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Sanchi Mizushima
1960 年 15 巻 1 号 p.
70-77
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
Liquid structure can be considered as a lattice distorted heavily by many dislocation lines. The dislocation density is supposed to be limited by the mutual contact of the cores of the dislocation lines. Calculation of the free energy as function of the dislocation density showed that above a certain temperature the lattice which has no dislocations at low temperatures changes abruptly into liquid by the appearance of the highest density of dislocations. Calculated heat of fusion of various metals agrees fairly well with experiment if the core radius is taken to be of the order of the lattice constant. In this model the thermal expansion of the liquids can be explained just in the same way as that of solids. A method of calculation was applied to determine the Grüneisen constant of molecular liquids with the result confirming this model.
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Kyoji Nishikawa
1960 年 15 巻 1 号 p.
78-92
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
Using Feynman diagrams, the dissipative hehaviour of a large quantum system of many fermions is discussed. On the basis of linked cluster expansion of the time-dependent perturbation theory, the master equation is derived for the time sufficiently long compared to the effective collision time and for a slowly varying initial distribution in the momentum space. Van Hove’s result for weak coupling limit and the equation for low density limit are obtained as special cases.
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Tsunesaburo Asada, Haruo Saito, Kazumi Omura, Taiji Oku, Masahiro Oka
1960 年 15 巻 1 号 p.
93-94
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
Isothermal annealing of germanium single crystals irradiated by γ-rays from Co 60 was studied. The variation of conductance with time was measured. The conductance curves are composed of three stages. To explain this fact, the model proposed by Fletcher and Brown may be employed with a certain modification. From the analysis of these curves, the activation energy of the direct recombination of vacancy interstitial pairs, that for the diffusion of interstitial atoms and that for the diffusion of vacancies were determined to be 0.765 eV., 0.741 eV. and 1.250 eV., respectively.
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Shinji Kawaji
1960 年 15 巻 1 号 p.
95-99
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
Measurements of the a.c. and d.c. field effects were made on the conductance of the germanium surfaces cleaned by Joule heating up to about 800°C in ultra-high vacuum. In the measurements of the a.c. field effect on the cleaned surface, the minimum of conductance showing the surface was slightly
n-type was observed and the density of fast states was estimated at 1.7×10
13/cm
2·volt. When the surface was exposed to oxygen, the fast state density decreased down to 2.4×10
12/cm
2·volt and the surface potential decreased by 0.03 volts. These results suggest that the fast states are dangling bonds at the surface. In the measurements of the d.c. field effect on the cleaned surface, the slow decay of the changes in conductance was not recognized. The slow decay appeared when the surface was exposed to air. These results show that the slow states are attributed to adsorbed gases on the outer surface of the oxide layer of germanium.
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Takanori Tomita
1960 年 15 巻 1 号 p.
99-105
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
A new modification of silicon carbide crystal, having rhombohedral symmetry and a unit cell composed of 174 layers, was found by X-ray study. The cell size and symmetry were determined in a similar way as in a previous study of silicon carbide of 594 layers. The structure, namely the stacking order of Si–C layers, of the new monification was determined by comparing the visual intensity with those calculated for a number of models. The structure is represented as {C(CCH)
7C
3(CCH)
11}×3 by Wyckoff’s notation.
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Kohji Shimaoka
1960 年 15 巻 1 号 p.
106-119
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
Temperature ranges of formation of low temperature forms of ice and the hydrogen position in cubic and hexagonal forms were studied by electron diffraction. The ranges were found to vary according to the rate of condensation of water vapor and the discrepancies between the previous data for the ranges were attributed to the difference of the rate. Intensity of Debye-Scherrer patterns showed best agreement with Pauling’s half-hydrogen model for cubic ice as well as for hexagonal ice. Difference radial distribution and two-dimensional difference Fourier analysis of cubic ice revealed also that Pauling’s model is appropriate. From two-dimensional difference Fourier map of three different projections, O–H distance was found to be 0.96±0.03 Å. By calculation, it was shown that a shift of electron cloud causes no appreciable shift of potential peak. An elliptical elongation of hydrogen peak perpendicular to O–H bond was observed, which can be attributed to a shift of H–O–H angle from the tetragonal angle as well as to anisotropic thermal vibration.
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Masao Sumi
1960 年 15 巻 1 号 p.
120-127
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
For a system consisting of a medium-plasma and an externally injected beam with non-uniform density and temperature, electron-plasma oscillations are described on the basis of linear macroscopic equations. In the one-dimensional case the spatially growing plasma wave and the standing plasma wave are discussed. It is found that in the former a wave propagating towards descreasing density grows up higher than in the uniform case; in the latter the wave-length becomes shorter towards lower density and jumps of mode and frequency occur at a thickness of the layer greater than that in the uniform plasma. Towards increasing density the circumstances mentioned above are reversed. Finally a brief account is given on the two-dimensional case.
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Shin-ichiro Narita
1960 年 15 巻 1 号 p.
128-136
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
By using the vapor-phase synthesis method, zinc sulfide single crystals were grown of pure zinc and bomb hydrogen sulfide and they were doped with two impurities, copper and chlorine.
The brightness waves of E. L. in these crystals were studied by applying rectangular pulse voltage.
Since the E. L. of “
in phase” was dominant in the crystals lacking chlorine and having appreciable voltage-dependency, it was concluded that it occurred as a result of the injection of electrons from the cathode.
In order to classify the mechanism of E. L. of “
out of phase,” infrared quenching of E. L. was used. E. L. in ZnS:Cl, Cu was typical case sensitive to the quenching, and E. L. in artificial junction (ZnS:Cl–ZnS:Cu) was the typical case insensitive to the quenching. It was supposed that the difference between these two cases resulted from the difference in the mechanism supplying the primary electrons of E. L.
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Shoichi Hirota, Tetsuji Imai
1960 年 15 巻 1 号 p.
137-144
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
Electron microscope observation on oxide coated cathode is undertaken especially on its decomposition process and on the prolonged heat treatment.
A new replica method which is used in this study is as follows; (1) deposition of SiO film at first on the specimen, (2) pressing the SiO-evaporated-specimen onto ethylmethacrylate resin film, (3) shadowing by germanium evaporation and (4) reinforcing with carbon film. This replica technique enables us to observe the exact surface structure of oxide cathode, which has a porous surface and which is very unstable in the atomosphere.
About the decomposition process, following results are obtained: Growth of the oxide crystal becomes significant at a certrin decomposition—temperature. For “triple carbonate”, this critical temperature lies at around 1100°C. With the “single carbonate”, crystal growth occurs at considerably lower temperature than with the triple.
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Kikusaburo Osada
1960 年 15 巻 1 号 p.
145-149
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
The glow curves of the thermoluminescence of some zinc sulfide phosphors are measured for two different exponential heating rates by means of an oscilloscope, and the values of the depth and frequency factor of their traps are obtained by the Booth method. The value of the frequency factor is not constant for all traps, but becomes larger as the depth increases.
The equations are also developed which permit the analysis of the glow curves for the exponential heating rate.
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Iwao Hosokawa
1960 年 15 巻 1 号 p.
149-157
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
A new method is proposed to calculate the velocity and pressure distributions around a thin symmetrical aerofoil or a slender body of revolution flying at transonic speed. It is essentially a refinement of the linearized transonic flow theory due to Oswatitsch and Maeder, such that a correction term is introduced to take account of the nonlinear character of the transonic flow. As examples of application, a symmetrical circular-arc aerofoil and a circular-arc body of revolution in the sonic flow are dealt with, and the results are found to be in good agreement with experiments, except for the rear portion in the latter case.
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Shigenori Ando
1960 年 15 巻 1 号 p.
157-167
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
General theory of electrically conducting gas past a three-dimensional thin body is presented. Fundamental equation for a parametric function is derived. The magnetic field, the flow velocity and the pressure are all connected to the parametric function, and so the boundary conditions for the fundamental equation can be written explicitly. The flow over a wavy wall is treated as an application of the present theory in which the applied magnetic field may be in an arbitrary direction.
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Kiichiro Matsuzawa
1960 年 15 巻 1 号 p.
167-174
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
A detailed study is made on the condenser microphones with back plates named ‘group IA’ in Part I of the present paper.
For each back plate, the surface roughness is studied by using profilograms and the distribution function of the surface profile is obtained. Formulae for the resonance frequency, the electrostatic capacitance and the low frequency sensitivity are obtained theoretically assuming a simple model microphone with a back plate having a profile represented by the above distribution function. The formulae are found to be in fairly good agreement with the experiments.
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Hirowo Yosinobu
1960 年 15 巻 1 号 p.
175-188
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
In the present paper is studied the flow of a viscous, incompressible and electrically conducting fluid past a fixed body in the presence of a parallel magnetic field. A perturbation method similar to Oseen approximation in ordinary hydrodynamics is applied to both the flow field and the magnetic field. It proves that the pressure number (namely, the ratio of the magnetic pressure to the dynamic pressure) plays an important role to determine the main features of the field. Detailed calculations are carried out for the flow past a circular cylinder and an approximate formula for the drag per unit span of the cylinder is obtained.
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Kanefusa Gotoh
1960 年 15 巻 1 号 p.
189-196
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
The flow of an incompressible, viscous, electrically conducting fluid past a sphere in the presence of a uniform magnetic field parallel to the undisturbed flow is investigated using Oseen approximation. The drag coefficient is calculated up to the second order of magnitudes of parameters: the Reynolds number
R, the magnetic Reynolds number
Rm and the Hartmann number
M. Its numerical values are shown graphically for a few typical cases. It is found that the drag coefficient is continuous at the pressure number
S=1, whereas it changes there abruptly in the two-dimensional case. The flow pattern changes remarkably according as the pressure number
S\gtreqqless1.
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Masaharu Toyama
1960 年 15 巻 1 号 p.
196
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
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Tokio Ohta
1960 年 15 巻 1 号 p.
197
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
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Akira Miyake, Riichirô Chûjô
1960 年 15 巻 1 号 p.
198
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
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Ikushi Yoshida, Shozo Sawada
1960 年 15 巻 1 号 p.
199-200
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
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Noboru Shibata
1960 年 15 巻 1 号 p.
200
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
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Akira Hirai
1960 年 15 巻 1 号 p.
201B-202B
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
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Riichirô Chûjô
1960 年 15 巻 1 号 p.
201A
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
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Tetsuo Matsumura, Yasaku Tanabe
1960 年 15 巻 1 号 p.
203
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
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Haruo Fujisaki, Yasaku Tanabe
1960 年 15 巻 1 号 p.
204
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
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Takashi Furuoya, Yozo Sasaki
1960 年 15 巻 1 号 p.
205-206
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
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Zensho Ishii, Takashi Furuoya, Yozo Sasaki, Kazutake Kohra
1960 年 15 巻 1 号 p.
206-207
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
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Motoichi Shibuya, Wataru Sasaki
1960 年 15 巻 1 号 p.
207-208
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
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Nisiki Hayasi
1960 年 15 巻 1 号 p.
208-209
発行日: 1960/01/05
公開日: 2007/06/01
ジャーナル
認証あり
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Kiiti Siratori, Shuichi Iida
1960 年 15 巻 1 号 p.
210-211
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり
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Hiroyuki Mizuno, Morio Inoue
1960 年 15 巻 1 号 p.
211
発行日: 1960/01/05
公開日: 2007/05/29
ジャーナル
認証あり