Two-neutron transfer in Sn isotopes beyond theN=82shell closure

Abstract

We have performed microscopic distorted-wave Born approximation calculations of differential cross sections for the two reactions 136 Sn(p,t) 134 Sn and 134 Sn(t,p) 136 Sn, which are within reach of near-future experiments with radioactive ion beams. We have described the initial and final nuclear states in terms of the shell model, employing a realistic low-momentum two-body effective interaction derived from the CD-Bonn nucleon-nucleon potential that has already proved quite successful in describing the available low-energy spectrum of 134 Sn. We discuss the main features of the predicted cross sections for the population of the low-lying yrast states in the two nuclei considered.

First observation of the π0h11/2⊗ν0h9/2 partner orbital configuration in the odd-odd Moon1, Gargano2, Naïdja3 et al. 2022Phys. Rev. CSelf Cite

“…The N3LOP interaction is based on the N3LO force developed within the chiral perturbation theory [27], while the Napoli interaction is derived from the CD-Bonn nucleon-nucleon potential [28]. These two interactions have been broadly employed to investigate nuclei in the northeast region of 132 Sn, by predicting features revealing a single particle as well as a collective nature [29][30][31][32][33][34][35][36]. The recently observed levels in Sb and Te isotopes from β-decay experiments were also described by using these interactions [8,9].…”

Nuclear structure of Te isotopes beyond neutron magic number N=82

“…In particular, the Q-box-folded-plus-folded-diagram method [34,35] has been employed by including in the perturbative diagrammatic expansion of the Q box one-and two-body diagrams up to second order in the interaction. The first interaction, which in the following is called Napoli, is based on the CD-Bonn NN potential [36], and has been adopted in several previous studies of neutron-rich nuclei beyond 132 Sn [37]. Particularly, it is shown that it reproduces very well the observed level scheme of 134 Sb, with one valence proton and one valence neutron, and the low-lying 5/2 + state in 135 Sb [38,39].…”

Nucleon pairing in Sn isotopes

“…The double-closed shell isotope 132 Sn located near the neutron-drip line. Two next even isotopes 134,136 Sn should be considered as one or two neutron pairs on 2 f 7/2 subshell over the magic core [20]. level J π = 6 + .…”