Neutron occupancies and single-particle energies across the stable tin isotopes

S.V. Szwec , D.K. Sharp , B.P. Kay , S.J. Freeman , J.P. Schiffer , P. Adsley (1) , C. Binnersley , N. de Séréville (1) , T. Faestermann , R.F. Garcia Ruiz , F. Hammache (1) , R. Hertenberger , A. Meyer (1) , I. Stefan (1) , A. Vernon , S. Wilkins , H.-F. Wirth

1 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

The occupancies and vacancies of the valence neutron orbitals across the stable tin isotopic chain from $112\le A\le 124$ have been determined. These were inferred from the cross sections of neutron-adding and -removing reactions. In each case, the reactions were chosen to have good angular-momentum matching for transfer to the low- and high-$\ell$ orbitals present in this valence space. These new data are compared to older systematic studies. The effective single-neutron energies are determined by combining information from energy centroids determined from the adding and removing reactions. Two of the five orbitals are nearly degenerate, below $N=64$, and approximately 2 MeV more bound than the other three, which are also degenerate.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

S.V. Szwec, D.K. Sharp, B.P. Kay, S.J. Freeman, J.P. Schiffer, et al.. Neutron occupancies and single-particle energies across the stable tin isotopes. Phys.Rev.C, 2021, 104 (5), pp.054308. ⟨10.1103/PhysRevC.104.054308⟩. ⟨hal-03262040⟩