136Sn and three body forces

TL;DR

This paper investigates the impact of three-body forces on the nuclear structure of 136Sn, showing that including these forces improves agreement with experimental excitation energies and transition probabilities.

Contribution

The study demonstrates that incorporating three-body forces into realistic interactions better reproduces experimental data for 136Sn, highlighting their importance in nuclear modeling.

Findings

Three-body forces improve theoretical predictions of 2+ energies.

Including three-body forces aligns transition probabilities with experimental data.

Empirical adjustments to matrix elements can produce mixed seniority states.

Abstract

New experimental data on 2+ energies of 136,138Sn confirms the trend of lower 2+ excitation energies of even-even tin isotopes with N > 82 compared to those with N< 82. However, none of the theoretical predictions using both realistic and empirical interactions can reproduce experimental data on excitation energies as well as the transition probabilities (B(E2; 6+ -> 4+)) of these nuclei, simultaneously, apart from one whose matrix elements have been changed empirically to produce mixed seniority states by weakening pairing. We have shown that the experimental result also shows good agreement with the theory in which three body forces have been included in a realistic interaction. The new theoretical results on transition probabilities have been discussed to identify the experimental quantities which will clearly distinguish between different views.