Proton occupancies in the even Se ground states via the (d, 3He) reaction

The spectroscopic factors for the levels of 73,75,77,79,81As have been measured in the Se(d, 3He)As reactions at 25.2 MeV. The proton occupation numbers deduced for the even Se isotopes show that the striking change in proton configuration, observed for the Ge isotopes between N ⩽ 40 and N ⩾ 42, does persist for the Se isotopes. This change is not reproduced, either by a model calculation using spectral distribution methods or by proton wave functions recently suggested for the Se isotopes to explain the results of the Se(d, 6Li)Ge reactions.