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

Tripathi, Vandana; Lubna, R. S.; Abromeit, B.; Crawford, H. L.; Liddick, S. N.; Utsuno, Y.; Bender, P. C.; Crider, B. P.; Dungan, R.; Fallon, P.; Kravvaris, K.; Larson, N.; Macchiavelli, A. O.; Otsuka, T.; Prokop, C. J.; Richard, A. L.; Shimizu, N.; Tabor, S. L.; Volya, A.; Yoshida, S.

doi:10.1103/PhysRevC.95.024308

$β$ decay of ${}^{38, 40}{Si}$ ( $T_{z} = + 5, + 6$ ) to low-lying core excited states in odd-odd ${}^{38, 40}P$ isotopes

Journal Article · Wed Feb 08 00:00:00 EST 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.024308· OSTI ID:1379727

Tripathi, Vandana ^[1]; Lubna, R. S. ^[1]; Abromeit, B. ^[1]; Crawford, H. L. ^[2]; Liddick, S. N. ^[3]; Utsuno, Y. ^[4]; Bender, P. C. ^[5]; Crider, B. P. ^[5]; Dungan, R. ^[1]; Fallon, P. ^[2]; Kravvaris, K. ^[1]; Larson, N. ^[3]; Macchiavelli, A. O. ^[1]; Otsuka, T. ^[6]; Prokop, C. J. ^[3]; Richard, A. L. ^[7]; Shimizu, N. ^[8]; Tabor, S. L. ^[1]; Volya, A. ^[1]; Yoshida, S. ^[9]

Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry, National Superconducting Cyclotron Lab.
Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Univ. of Tokyo (Japan). Center of Nuclear Study
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Univ. of Tokyo (Japan). Dept. of Physics; Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Katholieke Univ. Leuven, Heverlee (Belgium). Inst. for Nuclear and Particle Physics
Ohio Univ., Athens, OH (United States). Inst. of Nuclear and Particle Physics
Univ. of Tokyo (Japan). Center of Nuclear Study
Univ. of Tokyo (Japan). Dept. of Physics

Low-lying excited states in P^38,40 have been identified in the β decay of T_z=+5,+6, Si^38,40. 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-05CH11231; NA0000979; NA0002131; NA0002132; SC0009883

OSTI ID:: 1379727

Alternate ID(s):: OSTI ID: 1343341

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 95; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Systematic shell-model study of β -decay properties and Gamow-Teller strength distributions in A ≈ 40 neutron-rich nuclei Yoshida, Sota; Utsuno, Yutaka; Shimizu, Noritaka Physical Review C, Vol. 97, Issue 5 https://doi.org/10.1103/physrevc.97.054321	journal	May 2018

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