Abstract
Low-lying excited states in have been identified in the decay of . Based on the allowed nature of the Gamow-Teller (GT) decay observed, these states are assigned spin and parity of and are core-excited 1p1h intruder states with a parity opposite to the ground state. The occurrence of intruder states at low energies highlights the importance of pairing and quadrupole correlation energies in lowering the intruder states despite the shell gap. Configuration interaction shell model calculations with the state-of-art SDPF-MU effective interaction were performed to understand the structure of these 1p1h states in the even- phosphorus isotopes. States in with were found to have very complex configurations involving all the orbitals leading to deformed states as seen in neutron-rich nuclei with . The calculated GT matrix elements for the decay highlight the dominance of the decay of the core neutrons rather than the valence neutrons.
- Received 16 November 2016
- Revised 18 January 2017
DOI:https://doi.org/10.1103/PhysRevC.95.024308
©2017 American Physical Society