-
Shigeo Tanaka, Michiaki Furukawa, Takashi Mikumo, Shiro Iwata, Masuo Y ...
1960 年 15 巻 4 号 p.
545-550
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
Excitation functions for the reactions Mn
55(α,
n)Co
58, Mn
55(α, 2
n)Co
57, Mn
55(α, 3
n)Co
56, Mn
55(α, α′
n)Mn
54 and Mn
55(α, 2
pn)Mn
56 were measured by the activation method using a “stacked-foil” technique, the alpha-particle energies ranging from 10 MeV to 40 MeV. Bombardments were made with the alpha-particle beam of 32 MeV and 40 MeV from the 160 cm INSJ cyclotron. The beam was collected in a Faraday cup and measured by a current integrator. After bombardments, manganese, cobalt and iron were chemically separated. The disintegration rates of product nuclei Co
58, Co
57, Co
56 and Mn
54 were obtained by the gamma-ray scintillation spectrometry, while that of Mn
56 by a calibrated end-window type Geiger counter. The reaction cross section was found to agree with calculated value for a nuclear radius constant
r0 of 1.7×10
−13 cm. Competition between different reactions was analyzed in terms of the statistical model of nuclear reaction by use of a level density expression of ω=
cexp [2(
aE)
1⁄2] and it agrees with the calculated value for
a=2 MeV
−1.
抄録全体を表示
-
Susumu Morita, Nawoyuki Kawai, Naoyuki Takano, Yorio Gotô, Reiko ...
1960 年 15 巻 4 号 p.
550-556
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
The angular distributions of protons from the reaction C
12(
d,
p)C
13 were measured at the deuteron energies of 14.9−, 16.6−, 18.1−, and 19.6−MeV, for the proton groups leading to the lowest four levels of C
13. The proton groups to the second and third excited states were not resolved. The measurements covered the angular range from 15 to 165 degrees at intervals of 7.5 degrees. The results were compared with the stripping theory and qualitative agreement in the forward directions was obtained, but not in the backward.
The best fits for the angular distributions of the ground state group were obtained with the nuclear radius of (6.3±0.1)×10
−13 cm with Bhatia’s formula. The angular distributions changed regularly with the deuteron energy. The excitation function was found to decrease monotonically with the increase of deuteron energy but that in the backward directions showed a slower decrease than that for the forward directions.
抄録全体を表示
-
Minoru Takeda
1960 年 15 巻 4 号 p.
557-566
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
The differential cross section for deuteron-nucleus elastic scattering has been measured for N, O, Ne, Mg, Al, S, A, Ca, Cr, Fe, Ni, Cu, Kr, Ag, Xe and Au at the deuteron energy of 11.2 MeV. Measurements were done at 5° intervals from 15° to 165° with relative uncertainty of 3 to 5%. Deuterons were detected by a thin CsI(Tl) crystal whose energy resolution was about 4% so that in almost all the cases inelastic deutrons and protons produced from (
d,
p) reaction were rejected. The measured cross sections show a pronounced diffraction pattern in light and medium weight nuclei. But the cross sections for heavier elements show a smooth decrease and are smaller than the Rutherford cross sections.
The cross sections of deuterons leading to the first excited state of
20Ne and
24Mg by inelastic scattering have been obtained. However, we could not detect inelastically scattered deuterons in other elements. The angular distributions for
20Ne and
24Mg are explained by the direct nuclear process.
抄録全体を表示
-
Sigetosi Tanisaki
1960 年 15 巻 4 号 p.
566-573
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
Microscopic observation, thermal analysis, measurement of electrical resistivity and X-ray study of WO
3 were carried out in relation to the phase transition from room temperature down to −70°C. The crystal of WO
3 is monoclinic (
a=7.30Å,
b=7.53Å,
c=7.68Å, β=90°54′) at room temperature, and it transforms to triclinic (
a=7.30Å,
b=7.52Å,
c=7.69Å, α=88°50′, β=90°55′, γ=90°56′) near 17°C, and transforms to monoclinic (
a=5.27Å,
b=5.16Å,
c=7.67Å, β=91°43′) near −40°C, on cooling. These two transitions could be clearly observed in the single-domain crystal in the room temperature phase, but the phase transitions of complicated appearance were observed in the multidomain crystal owing to a small difference between free energies in the room-temperature phase and the triclinic phase. Both electrical resistivity versus temperature curve and thermal differential curve show a slight anomaly at 17°C transition and a remarkable anomaly at −40°C transition.
抄録全体を表示
-
Sigetosi Tanisaki
1960 年 15 巻 4 号 p.
573-581
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
The crystal structure of tungsten trioxide at room temperature has been studied by the X-ray oscillation method. The crystal has a monoclinic unit cell with
a=7.30 Å,
b=7.53 Å,
c=7.68 Å and β=90°54′, containing eight molecules of WO
3.
c axis length is as twice as the values reported by the other authors. The space group is
P2
1⁄
n. The structure analysis was performed by trial and error based on inspection of the Patterson projections along
a and
c axes. The arrangement of tungsten atoms is similar to the structure reported by Braekken. The positions of oxygen atoms, which had been determined hitherto mainly from packing considerations, could be obtained directly from the weak reflections with odd index
l. According to the obtained structure the crystal is antipolar in the directions of
a,
b and
c axes.
抄録全体を表示
-
Sh\={u} Chiba
1960 年 15 巻 4 号 p.
581-585
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
The magnetic properties of iron phosphide,
Fe2P, were investigated. It was found by means of a newly designed apparatus for the measurement of magnetization that the extrapolated saturation magnetization at absolute zero of temperature reaches 66.3 gauss per gram of iron, corresponding to a spin moment of 0.85±0.02 Bohr magneton per iron atom. The ferromagnetic Curie point is at 306°K. The Curie-Weiss law holds up to 900°K with the paramagnetic Curie point 478°K and the effective magneton number is 3.2±0.2. A brief remark is given for these data.
抄録全体を表示
-
Yosio Hiki
1960 年 15 巻 4 号 p.
586-592
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
The internal friction of transparent natural quartz was measured at room temperature with longitudinal vibration in kilocycle range using a composite piezo-electric oscillator. Specimens were cylinders axes of which took various orientations in the crystallographic YZ-plane. The internal friction of specimens parallel to the Y- or Z-axis was small and almost independent of the strain amplitude of the vibration, while that of specimens with other orientations was rather large and showed marked dependence on the amplitude. The experimental results were analyzed with the theory of dislocation damping based on the pinned-down dislocation model. It could be concluded that the internal friction of quartz was mainly due to the vibration of dislocations in the slip plane parallel to the Y- or Z-axis. The dislocation density in a specimen was estimated to be 10
3–10
4 cm
−2. It was also found that the dislocation density was reduced by annealing the specimen. The defects pinning down the dislocations were assumed to be aggregates of metallic impurities.
抄録全体を表示
-
Masayasu Ueta, Masamitsu Hirai, Hiroyuki Watanabe
1960 年 15 巻 4 号 p.
593-602
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
The quantum yield for the photochemical conversion of a
U center to an
F center as a function of illuminating photon energy has been investigated in KCl, KBr and their mixed crystals. For photons in the
U-absorption band the yield increases with the illuminating photon energy. It has been determined that the conversion occurs with a maximum yield of nearly unity for photons both in the shorter wave-length tail of the
U-absorption band and in the fundamental absorption tail-exciton band. The dependence of the yield of exciton-induced
U→
F conversion upon the temperature and
U center concentration has also been studied. The yield of unity is independent of the concentration in the range higher than 1.0×10
17/c.c.; however, it drops appreciably below 5×10
16/c.c., indicating that the exciton is movable and its maximum length of migration is of the order of 3×10
−6 cm.
抄録全体を表示
-
Jun-ichi Chikawa
1960 年 15 巻 4 号 p.
602-611
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
Argon-filled and xenon-filled three-anode proportional counters were designed so as to attain the quantum counting efficiency of about 90% for CuKα and MoKα radiation, respectively. Important properties of these counters are compared with those of NaI(Tl)scintillation counter. These proportional counters have remarkable superiority over NaI(Tl)scintillation counter in monochromatization effect upon the characteristic radiation in use of a pulse-height analyzer, though their quantum counting efficiencies for the characteristic radiation are almost the same.
A stabilizer of X-ray tube output utilizing an ionization chamber with balanced filters as a monitor was also constructed. High stability was attained without accurate regulation of the tube voltage.
抄録全体を表示
-
Yasuo Uehara
1960 年 15 巻 4 号 p.
612-629
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
In this paper, a fundamental equation of luminescence which can explain various luminescent properties of nonphotoconducting phosphors under excitation by ultraviolet of constant intensity at thermal equilibrium is formulated. According to this equation, various characteristics of Cu-activated β-calcium orthophosphate fired in a reducing atmosphere, such as temperature dependence of the quantum efficiency of fluorescence, thermoluminescence and stimulation or that of the quantum light-sum and fluorescent intensity, the build-up and fatigue of luminescence, the recovery from the fatigue of luminescence, and the relation between the fluorescent intensity and concentration of activators were calculated in detail by using an energy state model involving the ground, emitting, trapping and quenching states. Furthermore the detailed experimental results on the build-up of afterglow together with its theoretical results are described. A good agreement between the calculated and observed results was obtained.
抄録全体を表示
-
John T. Wajima, Brice M. Rustad, Edward Melkonian
1960 年 15 巻 4 号 p.
630-641
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
In order to cover the wave length range 1∼4Å with neutron crystal spectrometers, an attempt was made of using as a neutron monochrometer a germanium crystal. Germanium has a diamond cubic structure and the second order (222) reflection is theoretically forbidden. The intensity ratio of third to first order neutrons,
I3⁄
I1, at thermal energy with a 1/
v, BF
3 counter was determined experimentally by a double crystal method using a second silicon crystal analyser, to be 0.023±0.002 in agreement with the theoretically predicted values,
I3⁄
I1=0.0245 and
I4⁄
I1=0.0055. A maximum value of 0.2% was also measured for the second order contamination in the same way. The total higher order contamination determined from the transmission of pyrex glass plates was (4.7±0.5) % at thermal energy, assuming only the third order contamination. The comparison of Ge, Si and NaCl crystals as monochrometers is discussed. The experiment indicates the successful use of a germanium crystal in Å region as a neutron monochrometer and also confirms the ways of determining higher order contaminations.
抄録全体を表示
-
Tadao Horie, Takayuki Nagura, Masamoto Otsuka
1960 年 15 巻 4 号 p.
641-645
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
Observations have been done of electron bombardments of the C
2H
2, CH
2O and CH
3OH molecular jets in vacuum. The free radical CH
*(
B2Σ
−) always shows a normal distribution of angular momentum. This experimental result is entirely different from the previous reports on the free radical OH
*(
2Σ
+) splitting from H
2O or H
2O
2. For instance, the distribution curve for CH
* from C
2H
2 shows its maximum near
K=7, while that for OH
* from H
2O
2 near
K=20. This marked differences is discussed, and a statistical interpretation is also given of the angular momentum distribution for CH
* separating from C
2H
2.
抄録全体を表示
-
Tadao Shimizu, Hiroshi Takuma
1960 年 15 巻 4 号 p.
646-650
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
The microwave spectrum of cis-1,2-dichloroethylene was observed in the frequency range between 20 and 25 kMc/sec. The determined molecular parameters,
dCC1=1.724 A and ∠CCCl=121°33′ on the assumption of
dCC=1.32 A,
dCH=1.07 A and ∠CCH=120°, show good agreements with the parameters of vinylidene chloride, which was studied previously in this laboratory. The quadrupole hyperfine coupling constants were found to be
eQqaa=2 Mc/sec,
eQqbb=−22 Mc/sec and
eQqcc=20 Mc/sec.
抄録全体を表示
-
Hiroshi Okamoto
1960 年 15 巻 4 号 p.
650-657
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
Using the first order Bethe’s approximation, a theory of solution of chain molecules is developped. Though it is a well-known fact that the first order Bethe’s approximation and the method of the quasi-chemical equilibrium coincide with each other for the case of lattice gas or solutions of short chain, this coincidence is found to be not always true for solutions of long chain molecules. The obtained results have the favorable characteristics which the experimental facts require.
抄録全体を表示
-
Sekiko Ogawa, Syoten Oka
1960 年 15 巻 4 号 p.
658-668
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
In 1957, O’Konski and Haltner investigated electric birefringence in dilute solutions of tobacco mosaic virus (TMV) in alternating fields. The magnitude of the intrinsic Kerr constant, its frequency dependence and the transient behavior show that the orientation is produced by an induced polarization and that the permanent dipole coupling is negligible. They explained their experimental results by assuming that the transient birefringence follows the first-order rate law.
It is the aim of this paper to calculate the electric birefringence in dilute solutions of TMV in alternating fields with the aid of the distribution functions. The theory is in agreement with the experimental results in that i) the phase retardation of the birefringence relative to the field is proportional to the frequency, ii) the maximum and minimum values of the steady-state birefringence are unity and zero at zero frequency and both values become asymptotically 1/2 with increasing frequency and iii) the magnitude of birefringence decreases rapidly when the frequency is increased beyond 30 kc/sec.
抄録全体を表示
-
Masayuki Asami, Fumihiko Takano
1960 年 15 巻 4 号 p.
669-677
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
The gauge invariance of B.C.S. explanation of the Meissner effect is guaranteed by the inclusion of the collective excitations, as shown by Anderson and Yosida. In this case, however, the current, which can be neglected in B.C.S. calculation, might become to make a finite contribution to the Meissner effect. It is shown that this is actually the case in a system of normal electrons with Coulomb interactions. The situation in superconductors does not seem to differ essentially from that of normal electrons with this respect. This conclusion means that the gauge invariant theory of the Meissner effect cannot be said to be complete unless this difficulty is solved.
Moreover, the canonical transformation leading to the B.C.S. model adds some terms to the current operator. The magnitude of these terms is estimated, and is shown to make a numerically small but finite contribution to the Meissner effect also.
抄録全体を表示
-
Kenji Mitani, Hiroshi Kubo
1960 年 15 巻 4 号 p.
678-684
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
We measured the breakdown probability at a low pressure in argon over the range from 0 to 1,500 gauss of the magnetic field parallel to the electric field. With the overvoltage fixed at 16.5%, the number of times of breakdown was counted for the applied square pulses with an electronic counter. Thus we found that the breakdown probability increased with magnetic field intensity. We calculated the breakdown probability on the assumption that breakdown was caused by multi-avalanche, and the secondary mechanism was due to the drift of resonance radiation in the diffusion process as Kachikas and Fisher had suggested. A fairly good agreement between theory and experiment was attained and the drift velocity of resonance radiation was about 9.5×10
5 cm. sec
−1 in our calculation.
抄録全体を表示
-
Taro Kihara, Yukio Midzuno, Kyoko Sakuma, Toshio Shizume
1960 年 15 巻 4 号 p.
684-687
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
Relaxation between ion and electron temperatures,
T1 and
T2, of dilute fully ionized gases in a magnetic field has been treated by force-correlation method. The rate
R of the relaxation, defined by
d(
T2−
T1)⁄
dt=−(
T2−
T1)
R,
increases with increasing magnetic field from
R=
R0ln (
tp⁄
ts) for ω
2tp\lesssim1
to
R=
R0\left[ln (
tp⁄
ts)+\frac12(lnω
2tp)
2\
ight] for ω
2tp>>1,
in which
R0=(
n1+
n2)(8
m2⁄3
m1)(2π
kT2⁄
m2)
1⁄2(
Ze2⁄
kT2)
2.
Here
m1,
Ze and
n1 are the mass, charge and number density of the ion respectively;
m2, −
e, and
n2 are those of the electron;
tp is the period of plasma oscillation and
ts is the mean time of passage through a sphere of strong interaction,
ts∼(
m2⁄
kT2)
1⁄2Ze2⁄
kT2; ω
2 is the electron gyration frequency.
抄録全体を表示
-
Tsunehiko Kakutani
1960 年 15 巻 4 号 p.
688-695
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
This paper deals with the axially symmetric stagnation-point flow of an incompressible, viscous and electrically conducting fluid in the presence of a transverse magnetic field with small magnetic Reynolds numbers. The velocity distribution modified by the magnetic field is calculated for several values of
N (=
SRm,
S: the pressure number,
Rm: the magnetic Reynolds number). The shear stress on the wall is expressed in terms of
b and φ″(0), where
b is a characteristic parameter of the asymptotic inviscid flow and φ″(0) is the non-dimensional velocity gradient on the wall.
The flow of this type may be considered as a simple model of the circumstance in the neighbourhood of the nose of a body of revolution moving through an ionized atmosphere at hypersonic speed. In this context, it may be convenient to use Bush’s results for estimating
b. The ratio of the shear stresses with and without the magnetic field thus calculated is shown graphically as a function of
N. It is found that the shear stress at the wall is considerably reduced by the hydromagnetic interactions.
抄録全体を表示
-
Kanefusa Gotoh
1960 年 15 巻 4 号 p.
696-705
発行日: 1960/04/05
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 an obstacle in a uniform magnetic field is investigated using Stokes approximation. No particular configuration of the flow and the magnetic field is assumed, so that the result applies to the general three-dimensional problems.
§§ 2 and 3 deal with the general theory. It is found that the neutrality of the electric charge density does not hold exactly, when the undisturbed magnetic field is not perpendicular to the vorticity vector. It is also found that the vorticity and the electric current density are confined in a paraboloidal region, thus making a ‘wake’ which extends in the direction of the undisturbed magnetic field. Distribution of the electric charge density also shows the same structure.
In § 4, the flow past a sphere is investigated as an example. The drag is obtained in a power series of the Hartmann number
M. The component of the drag perpendicular to the undisturbed magnetic line of force is found to be larger than its parallel component. It is pointed out as an interesting feature of the three-dimensional cases that the velocity field includes components which express the two-dimensional irrotational flow.
抄録全体を表示
-
Yoshirô Ômori
1960 年 15 巻 4 号 p.
706-718
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
Experiments have been carried out to determine precisely the psychrometer constant
A for dry and humid air in the temperature range of 0∼40°C. The results were compared with a theoretical formula derived by the present writer by the use of the analogy between the transfers of heat and mass by which
A is represented to be proportional to (
Cpρ
D⁄
K)
n. Experimental values of
A are found to be about 4% larger than the theoretical value obtained by taking, as usual,
n=0.3. The deviation is minute, but better agreement can be obtained by adopting the value of 0.5 for
n.
Experiments have also been carried out to examine effects on
A of various factors such as atmospheric pressure, size of a psychrometer, ventilation and conditions of supercooling or freezing of wet-bulbs, obtaining good agreement with the theory.
抄録全体を表示
-
Ryusuke Kono
1960 年 15 巻 4 号 p.
718-725
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
The transverse and longitudinal wave measurement on polystyrene and polymethyl methacrylate was carried out at frequencies of 0.5, 1, and 2.25 Mc, in the temperature range 20°C to 190°C. For the transverse wave measurement, a modified rotating plate method was used. An energy-dissipating process associated with volume deformation was found in these polymers. The activation energy associated with shear deformation is somewhat different from that associated with volume deformation, so that the molecular mechanism involved in the two types of deformation may be different.
抄録全体を表示
-
Toshio Tanaka, Shoji Tanaka
1960 年 15 巻 4 号 p.
726
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Tanehiro Nakau
1960 年 15 巻 4 号 p.
727
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Hazime Kusumoto, Junkichi Itoh, Kozo Hirota, Tomiko Ueda
1960 年 15 巻 4 号 p.
728-729
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Yoshihiko Mizushima, Yoshitaka Igarashi, Tetsuji Imai
1960 年 15 巻 4 号 p.
729
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Yoshitaka Furukawa
1960 年 15 巻 4 号 p.
730
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Kazuo Husimi
1960 年 15 巻 4 号 p.
731
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Jiro Nishimura
1960 年 15 巻 4 号 p.
732
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Osamu Saburi
1960 年 15 巻 4 号 p.
733-734
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
M. Garber
1960 年 15 巻 4 号 p.
734-735
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Shigeo Nagao, Teruyuki Sato
1960 年 15 巻 4 号 p.
735
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Chikai Ishii, Kasuke Takahashi
1960 年 15 巻 4 号 p.
736-737
発行日: 1960/04/05
公開日: 2007/06/01
ジャーナル
認証あり
-
Tadayoshi Doke, Atsushi Nakamoto, Yasukiyo Takami, Manabu Hattori, Shi ...
1960 年 15 巻 4 号 p.
737-738
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Takejiro Kaneko
1960 年 15 巻 4 号 p.
738A
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり
-
Wataru Segawa
1960 年 15 巻 4 号 p.
738B
発行日: 1960/04/05
公開日: 2007/05/29
ジャーナル
認証あり