Some evidence for neutron pick-up from the interior core through the (p, d) reaction

Abstract

The (p, d) reactions on 94, 98, 100Mo were studied with 52 MeV protons. Deuteron spectra were measured up to 12 MeV of excitation in the residual nuclei. The angular distributions for the three reactions integrated over the final levels in a range of excitation from 2 to 6 MeV are in good agreement with each other, though the relevant parts of the deuteron spectra apparently show isotope-dependent structures. From a comparison of the results obtained in this study with those from the (p, d) reactions on neutron closed-shell nuclei 90Zr and 92Mo, it is indicated that the (p, d) transitions to the levels in this particular range of excitation in 93, 97, 99Mo are mainly due to neutron pick-up from the N = 29–50 major shell and that the transition strengths integrated over these transitions are in fair agreement with the sum-rule limit. A comparison is also made between the results obtained in this study and those from the (p, d) reactions on 117, 118Sn, from which it is suggested that the broad peaks found in the deuteron spectra from the latter two reactions at excitation energies between 7–12 MeV in 116Sn and 5–10 MeV in 117Sn are mainly due to neutron pick-up from the N = 29–50 shell. Again, the transition strengths for the broad peaks are estimated to be in fair agreement with the sum-rule limit.