Analyzing powers and cross sections for (p, d) reactions on nuclei of N = 50–82

Abstract

Vector analyzing powers A( θ) and cross sections σ(θ) have been measured, with the use of a polarized proton beam of 22.0 MeV and a magnetic spectrograph, for (p, d) reactions leading to the following final states, the excitation energy being given in MeV: 91 Zr( g.s., 5 2 +), 91 Zr(1.21, 1 2 +), 91 Zr(1.47, 5 2 +), 91 Zr(1.88, 7 2 +), 91 Zr(2.04, 3 2 +), 101 Ru( g.s., 5 2 +), 105 Pd( g.s., 5 2 +), 107 Pd( g.s., 5 2 +), 107 Pd(0.12, 1 2 +), 107 Pd(0.21, 11 2 −), 111 Cd( g.s., 1 2 +), 113 Cd( g.s., 1 2 +), 117 Sn( g.s., 1 2 +), 117 Sn(0.16, 3 2 +), and 117 Sn(0.32, 11 2 −) . Angular distributions of A( θ) and σ(θ), resulting from neutron transfers of l = 0, 2, 4, 5 and thus j = 1 2 , 3 2 , 5 2 , 7 2 , 11 2 , have been measured from 5° to 65° in 5° or 2.5° steps. The analysis was carried out with finite-range and zero-range DWBA calculations. Spectroscopic factors were extracted. A comparison of the predictions of the deuteron adiabatic theory with conventional DWBA theory predictions was made. The effect of the two-step (p, p')(p', d) processes was studied by taking into account a strong excitation of the first 2 + state in the proton inelastic channel. Also the effect of the deuteron D-state on A( θ) and σ(θ) was investigated. A phenomenological treatment was provided so as to remedy a large discrepancy between the experimental σ(θ) and A( θ) and the theoretical ones observed in the case of the large angular momentum transfers.