Realistic shell-model calculations for proton particle-neutron hole nuclei around132Sn

Abstract

We have performed shell-model calculations for nuclei with proton particles and neutron holes around 132 Sn using a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential. For the proton-neutron channel this is explicitly done in the particle-hole formalism. The calculated results are compared with the available experimental data, particular attention being focused on the proton particle-neutron hole multiplets. A very good agreement is obtained for all the four nuclei considered, 132 Sb, 130 Sb, 133 Te and 131 Sb. We predict many low-energy states which have no experimental counterpart. This may stimulate, and be helpful to, future experiments.

Observation of a μs isomer in In8549134 : Proton-neutron coupling

“…The neutron-proton effective interaction has been explicitly derived in the particlehole formalism as described in Ref. [5].…”

“…Nuclei with two particles, two holes, or one particle and one hole with respect to a core, offer one of the best opportunities to constrain such effective residual interaction [2][3][4]. Odd-odd and odd-A nuclei with few valence nucleons provide important additional information for a more comprehensive test of the protonneutron channel [5]. The present work is part of the BRIKEN experimental campaign, an international collaborative effort to study β-delayed neutron emission at RIKEN [6], and was aimed at the search for low-energy isomeric states in the odd-odd nuclei 132 In, 134 In, and 130 Ag, which were predicted in Ref.…”

Coulomb excitation of neutron-rich Cd isotopes

“…Within the shell model, two interactions were used, namely the jj 45pna [38] and Napoli interactions [20,[39][40][41]. For the effective charges e π = 1.35 and e ν = 0.78 were used, as in Ref.…”

High-spin states above the isomers in neutron-rich iodine nuclei near N=82

“…The nuclei with either odd numbers of valence protons (odd-Z) or odd numbers of valence neutrons (odd-N ) near a major shell closure were always of special interests as their level structures carry an important link to nucleon-nucleon effective interaction [1][2][3]. The doubly magic 132 Sn (Z = 50, N = 82) has a robust shell closure having its first excited state at 4.0 MeV [4].…”

“…The doubly magic 132 Sn (Z = 50, N = 82) has a robust shell closure having its first excited state at 4.0 MeV [4]. Thus, the single particle excitations, particle-hole interactions and mixing of various single particle configurations in nuclei with few valence particles/holes around 132 Sn have been the subject of contemporary interest, both experimentally [5][6][7][8][9] and theoretically [2,10]. In particular, nuclei with a few odd valence protons outside Z = 50 shell with few neutron holes in N = 82 shell, provide important information about the multiplets of various particle-hole configurations.…”