The neutron particle structure of the germanium isotopes

Abstract

The levels of 71, 72, 73, 75Ge have been investigated with the (p, d) reaction at 20 MeV. DWBA predictions were used to obtain l n transfers and absolute spectroscopic factors. In the reactions with the even- A targets only one l n = 4 transfer was observed and a single l n = 1 transfer to a low-lying level carried most of the available 2 p 1 2 spectroscopic strength. In contrast approximately 50% of 2p 3 2 and 1 f 5 2 spectroscopic strengths were found to be spread over many levels at higher excitation. The center-of-gravity energies and filling coefficients of the 2p 3 2 , 1 f 5 2 , 2 p 1 2 and 1 g 9 2 neutron Subshells calculated from these measurements are in generally goo agreement with the existing information on Ni, Zn and Se. The 2 p 3 2 and 1 f 5 2 shells are almost full for N > 38 and additional neutrons preferentially fill the 1 g 9 2 shell.