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β decay of Si 38,40 (Tz=+5, +6) to low-lying core excited states in odd-odd P 38,40 isotopes

  • Author(s): Tripathi, V;
  • Lubna, RS;
  • Abromeit, B;
  • Crawford, HL;
  • Liddick, SN;
  • Utsuno, Y;
  • Bender, PC;
  • Crider, BP;
  • Dungan, R;
  • Fallon, P;
  • Kravvaris, K;
  • Larson, N;
  • Macchiavelli, AO;
  • Otsuka, T;
  • Prokop, CJ;
  • Richard, AL;
  • Shimizu, N;
  • Tabor, SL;
  • Volya, A;
  • Yoshida, S
  • et al.
Abstract

Low-lying excited states in P38,40 have been identified in the β decay of Tz=+5,+6, Si38,40. Based on the allowed nature of the Gamow-Teller (GT) decay observed, these states are assigned spin and parity of 1+ 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 N=20 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-A phosphorus isotopes. States in P40 with N=25 were found to have very complex configurations involving all the fp orbitals leading to deformed states as seen in neutron-rich nuclei with N≈28. The calculated GT matrix elements for the β decay highlight the dominance of the decay of the core neutrons rather than the valence neutrons.

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