Norio Kishida

Gamma-Ray Angular Distribution, Angular Correlation, Linear Polarization, and Doppler-Shift Attenuation Measurements in the 46Ti(α, nγ) 49Cr Reaction

A detailed investigation of the electromagnetic properties of the 49 Cr levels below 3 MeV has been made. The levels were populated by the 46 Ti (α, nγ) 49 Cr reaction at E α =8 MeV. Analysis of measured gamma-ray angular distributions, linear polarizations, and gamma-gamma angular correlations has given the following unique spin and parity assignments: 9/2 - to the 1083-keV level; 1/2 - to the 1703-keV level; 5/2 + to the 2432-keV level; and 7/2 - to the 2503-keV level. In addition, a unique 5/2 assignment has been given to the 2168-keV level. Lifetimes of some levels have been obtained from Doppler-shift attenuation measurements. New or revised values of branching ratios and mixing ratios have been determined for many transitions. The unique 5/2 + assignment to the 2432-keV level and a large B (E2) value obtained for the transition to the 1981-keV 3/2 + level suggest that the 2432-keV level is a member of the K π =3/2 + band built on the 1981-keV level.

Proton Inelastic Scattering on 28,29,30Si and Blocking Effect in the Core-Excitation of 29Si

Angular distributions of elastic and inelastic scatterings on 28,29,30 Si were measured with a 51.9 MeV proton beam. The blocking effect in the core-excitation of 29 Si due to the antisymmetrization between the excited-core and the extra neutron was investigated. Optical model and distorted wave Born approximation analyses were performed using a macroscopic form factor for a collective excitation of 28,29,30 Si and a microscopic form factor for a single particle excitation of 29 Si. In the case of 29 Si, a mixing of an excited-core state and a single particle state was taken into account following the intermediate-coupling model calculation. Deformation parameters β 2 of 28,29,30 Si were extracted to be 0.42, 0.36 and 0.36, respectively. The reduction in the deformation parameter of 29 Si is considered to manifest the blocking effect of 25±14% in the core-excitation.

Vector analyzing power and polarization measurements for the 116Sn(d, p)117Sn reaction and deuteron D-state effects

Abstract The vector analyzing power A y and polarization P y have been measured for the l n = 0 reaction 116 Sn(d, p) 117 Sn(g.s.) at E d = 22 MeV to obtain the quantities S p = 2( P y - A y ) and S d = 3 A y - 2 P y . Large and negative values of S d can be explained by deuteron D-state effects.

Three-Ge(Li) Compton polarimeter with kinematic selection

Abstract The performance of a three-Ge(Li) Compton polarimeter with kinematic selection has been investigated. It has been shown that elimination of unwanted events by kinematic selection makes it possible to construct a polarimeter which has high polarization sensitivity, large solid angle and good signal-to-noise ratio. The usefulness of the polarimeter has been demonstrated in an example of the spin-parity assignment of the 2432 keV state in 49Cr.

Exact Finite-Range DWBA and Adiabatic-Deuteron-Breakup Calculations Including the Deuteron D-State for the 58Ni(p, d)57Ni Reaction at 52 MeV

Deuteron D-state effects are studied in the exact finite-range calculations for the 58 Ni(p, d) 57 Ni reaction at E p =52 MeV. The D-state effects on differential cross sections are still rather small at 52 MeV, and the observed angular distributions cannot be reproduced in a consistent manner although the quality of fits are slightly improved.

Effects of the deuteron D state on the polarization of the residual nuclear state

A clear indication of the effects of the deuteron D state on the polarization of the residual nuclear state has been observed in the 58Ni(p,dγ) angular correlation measurement at an incident energy of 30 MeV.

Contributions of spin‐dependent effects to the vector analyzing power and proton polarization for ln=0 (d,p) reaction

Both the vector analyzing powers and the proton polarizations have been measured for the 116Sn(d,p)117Sn(grd., 1/2+) and 29Si(d,p) 30Si(grd.,0+) reactions at 22.2 MeV. The separation of the contributions from the proton and deuteron spin‐orbit distortions has been performed for these ln=0 transfers using the method of Johnson. The obtained results have been compared with DWBA and the adiabatic calculations.