Vol. 16, No. 2 (1960)
1960-01-20
CONTENT
1960, 16 (2): 57-60.
doi: 10.7498/aps.16.57
Abstract +
In this paper we have calculated the anomalous moment of the nucleon with different mass of the strange particles and compared our calculation with the S. N. Gupta's result which is obtained by taking no account of the different mass effect of the strange particles.
1960, 16 (2): 61-69.
doi: 10.7498/aps.16.61
Abstract +
The rate of the muon capture reaction μ-+He3→H3+ v, the angular distributionand the polarization of the final nucleus H3 are calculated basing on the universal V- A coupling with induced pseudoscular term and the weak magnetic current included. A general initial condition with polarized muon and polarized He3 nucleus in different hyperfine states is assumed.The ground state wave function is assumed to be a pure S-state. Thus we neglected the contribution of other states, which may be caused by the presence of tensor force or other velocity dependent forces. Meson exchange current is also neglected. Under these assumptions we have proved that the capture amplitude contains only one unknown nuclear matrix element, which is the Fourier transform of the nuclear density function. To determine this nuclear matrix element by the scattering of electron (or muon) with He3 (H3) nucleus is finally proposed.
1960, 16 (2): 70-75.
doi: 10.7498/aps.16.70
Abstract +
Recent experiments seem to show that the sign of the effective pseudoscakr term in μ-caplure reactions is different from the theoretical resuk of Goldberger and Treiman based on V-A theory and dispersion relation technique. A possible explanation of this difference is proposed in the present note. It is shown that a very small p. s. tern in the HamiHonian (of the order 1/100 of the effective p. s. term) can change the sign of the effective p. s. term. If this small term is transformed and added as a part of the universal axial vector current, it will produce practically no effect in β-decay and π→ μ+ v decay. Finally the inclusion of hyperon pairs is considered.
1960, 16 (2): 76-80.
doi: 10.7498/aps.16.76
Abstract +
The correction of the recoil to the potential in the scattering of ???-mesons (or electrons) by zero-spin nuclei is derived by means of a simple method. The potential obtained is corrected to first order in the velocity of the nuclei but without restriction on the velocity of the μ-mesons (or electrons). The effect of recoil on the phase-shift and cross section is discussed. The results are compared with those of Foldy, Ford and Yennie. It is pointed out that the method used in the latter's work is not perfect, because it makes use of Breit's interaction which is valid only for small velocities.
1960, 16 (2): 81-85.
doi: 10.7498/aps.16.81
Abstract +
This paper deals with the dependence of the structure of Epoxy Resin upon the condition of outing process when anhydrids are used as curing agents, and from those investigations favor-able curing condilions are ascertained. Some possible form of molecular connections between the lipoxy Rcsin anil the cnting agent are also discussed.
1960, 16 (2): 86-93.
doi: 10.7498/aps.16.86
Abstract +
The gamma-rays, cmitted in the decay of Ag110m have been studied by use of gamma-spectro-meter and gamma-gamma coincidence techniques Fourteen gamma-rays have been found with energies of 448, 620, 656, 679, 705, 741, 764,817, 884, 936, 1384, 1473, 1504 and 1560 kw. All those gamma-rays can be fitted into seven excited levels in Cd110 of energies 656 kev, 1473 kev, 1540 kev, 2160 kev, 2219 kev, 2476 kev and 2924 kev respectively. The generally accepted cascade relationship between gamma-rays has been verified. Furthermore, coincidence measurements have pointed out that the 1560 kev gamma-ray is emitted during the transition between 2219 kev level and 656 kcv level, that the 817 kev gamma-ray belongs to transition beween 1473 kev level and 656 kev level, and that the 764 kev gamma-ray should proceed the 1504 kev gamma-ray. A modified decay schcml has been proposed.
1960, 16 (2): 94-97.
doi: 10.7498/aps.16.94
Abstract +
A combination of ion source modulation and modulation of the accelerating voltage is employed for a 1.2 metre cyclotron to obtain pulsed ion beam. The minimum pulse duration is about 1-2 microseconds; the frcquency can be varied continuously from about 0.2 to 1000 cycles.
1960, 16 (2): 98-106.
doi: 10.7498/aps.16.98
Abstract +
The object of this work is to study the influence of polarization effect on energy loss of low energy electrons passing through different dielectrics. The average and most probable energy losses of 0.3-1.0 Mev electrons passing through Be, C and Al foil are measured by using Wilson cloud chamber filled with hydrogen. The experimental result indicates that in such energy region the energy loss of electrons passing through dielectrics, possessing large f0-and ρ-value, such as Be and C, is appreciably reduced due to the pola-rizatioa effect. Here f0 is the ratio of the number of conducting electrons to that of total electrons in the dielectrics and ρ is the resistivity of the dielectrics. The experimental value of the energy loss of electrons passing through Be is smaller than the theoretical values given by Helpern and Hall, and by Sternheimer, who have taken into account of the polarization effect; the experimental value of energy loss of electrons passing through C lies between the two theoretical values.
