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

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.

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [5];  [1];  [2];  [1];  [3];  [1];  [6];  [3];  [7];  [8];  [1];  [1];  [9]
  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
  3. Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry, National Superconducting Cyclotron Lab.
  4. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Univ. of Tokyo (Japan). Center of Nuclear Study
  5. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  6. 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
  7. Ohio Univ., Athens, OH (United States). Inst. of Nuclear and Particle Physics
  8. Univ. of Tokyo (Japan). Center of Nuclear Study
  9. Univ. of Tokyo (Japan). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
OSTI Identifier:
1379727
Alternate Identifier(s):
OSTI ID: 1343341
Grant/Contract Number:  
AC02-05CH11231; NA0000979; NA0002131; PHY-1401574; PHY-1102511; SC0009883; NA0002132
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., and Yoshida, S. β decay of Si38,40 ( Tz=+5,+6 ) to low-lying core excited states in odd-odd P38,40 isotopes. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.024308.
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. β decay of Si38,40 ( Tz=+5,+6 ) to low-lying core excited states in odd-odd P38,40 isotopes. United States. doi:10.1103/PhysRevC.95.024308.
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., and Yoshida, S. Wed . "β decay of Si38,40 ( Tz=+5,+6 ) to low-lying core excited states in odd-odd P38,40 isotopes". United States. doi:10.1103/PhysRevC.95.024308. https://www.osti.gov/servlets/purl/1379727.
@article{osti_1379727,
title = {β decay of Si38,40 ( Tz=+5,+6 ) to low-lying core excited states in odd-odd P38,40 isotopes},
author = {Tripathi, Vandana and Lubna, R. S. and Abromeit, B. and Crawford, H. L. and Liddick, S. N. and Utsuno, Y. and Bender, P. C. and Crider, B. P. and Dungan, R. and Fallon, P. and Kravvaris, K. and Larson, N. and Macchiavelli, A. O. and Otsuka, T. and Prokop, C. J. and Richard, A. L. and Shimizu, N. and Tabor, S. L. and Volya, A. and Yoshida, S.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.95.024308},
journal = {Physical Review C},
number = 2,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}

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