Description for N=126 Isotones 210Po and 212Rn with Particle-Hole Excited Nucleon-Pair Approximation and Realistic Effective Interaction

In this paper, we study yrast states of two N=126 isotones Po-210 and Rn-212 using the nucleon-pair approximation with particle-hole excitations and using a low-momentum interaction Vlow-k renormalized from the free CD-Bonn NN potential. An overall good agreement with experimental level structures, B(E2)s, and B(E3)s, is achieved. We also calculate the probabilities of neutron particle-hole excitations in these yrast states, with a focus on negative-parity states, which reflect the roles played by the neutron negative-parity configurations of one-particle-one-hole excitations across the N=126 shell gap and the negative-parity configurations of valence proton particles involving the 0i(13/2) orbit. The N=126 shell gap is discussed in terms of energies of neutron one-particle-one-hole excitations.

Automated summary

In this paper, the yrast states of Po-210 and Rn-212 isotones with N=126 are studied using the nucleon-pair approximation and particle-hole excitations, with a low-momentum interaction Vlow-k renormalized from the free CD-Bonn NN potential. The results show a good agreement with experimental level structures, B(E2)s, and B(E3)s. The probabilities of neutron particle-hole excitations in the yrast states are also calculated, with a focus on negative-parity states and their configurations across the N=126 shell gap.