Nucleon pairing in Sn isotopes

Abstract

Abstract. The systematics of excited states in Sn isotopes are discussed on basis of pairing interaction in nuclei. Nucleon paring leads to formation of excited states multiplets. The estimation of multiplet splitting based on experimental nuclear masses allows one to calculate the position of excited states with different seniority in δ-approximation. The wide systematics of the spectra of Sn isotopes gives a possibility to check the pairing interaction for different subshells and consider the multiplets of excited states in the neutron-rich isotopes far from stability.

Mass differences and neutron pairing in Ca, Sn and Pb isotopes

“…Nevertheless, δe values have pronounced changes, but they are minimal for N > 70. In this region, the subshells with large values of j, 1h 11/2 and 2f 7/2 , are filled, which leads to the characteristic spectra of the low-energy excited states in these isotopes [38]. A sharp leap in the three-point indicator ∆ (3) nn (N ) for N =82 values corresponds to the transition to a new shell, and the decrease in the pairing effect that occurs can be related to a decrease in the number of projections j on the outer shells [39], 16 on the subshell (d 3/2 ,h 11/2 ) compared to 8 on the more isolated subshell f 7/2 :…”