β decay of Si38,40 (Tz=+5,+6) to low-lying core excited states in odd-odd P38,40 isotopes

Vandana Tripathi, R. S. Lubna, B. Abromeit, H. L. Crawford, S. N. Liddick, Y. Utsuno, P. C. Bender, B. P. Crider, R. Dungan, P. Fallon, K. Kravvaris, N. Larson, A. O. Macchiavelli, T. Otsuka, C. J. Prokop, A. L. Richard, N. Shimizu, S. L. Tabor, A. Volya, and S. Yoshida
Phys. Rev. C 95, 024308 – Published 8 February 2017

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 N28. 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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  • Received 16 November 2016
  • Revised 18 January 2017

DOI:https://doi.org/10.1103/PhysRevC.95.024308

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Vandana Tripathi1, R. S. Lubna1, B. Abromeit1, H. L. Crawford2, S. N. Liddick3,4, Y. Utsuno5,6, P. C. Bender4, B. P. Crider4, R. Dungan1, P. Fallon2, K. Kravvaris1, N. Larson3,4, A. O. Macchiavelli1, T. Otsuka7,4,8, C. J. Prokop3,4, A. L. Richard9, N. Shimizu6, S. L. Tabor1, A. Volya1, and S. Yoshida7

  • 1Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 2Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
  • 4National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 6Center of Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 7Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 8Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
  • 9Institute of Nuclear and Particle Physics, Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA

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Issue

Vol. 95, Iss. 2 — February 2017

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