Cross-shell excitations in {sup 30}Al and {sup 30}Si at high spin.

Journal Article · Wed Dec 01 00:00:00 EST 2010 · Nuclear Physics, A

DOI:https://doi.org/10.1016/j.nuclphysa.2010.07.010· OSTI ID:1039509

Steppenbeck, D; Deacon, A N; Freeman, S J; Janssens, R V F; Carpenter, M P; Hoffman, C R; Kay, B P; Lauritsen, T; Lister, C J; O'Donnell, D; Ollier, J; Seweryniak, D; Smith, J F; Spohr, K -M; Tabor, S L; Tripathi, V; Wady, P T; Zhu, S ^[1]

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1. Physics

Yrast and near-yrast states in {sup 30}Al and {sup 30}Si have been populated to high spin with the {sup 18}O + {sup 14}C fusion-evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J {approx} 9 {h_bar} at 9.4 and 15.5 MeV, respectively. Their decay schemes indicate that cross-shell excitations dominate at high spin, where negative-parity structures exist. Positive-parity states are compared to the results of shell-model calculations using the USD, USDA, and USDB effective interactions. The negative-parity levels are compared to predictions of the WBP interaction and the recently-developed WBP-a Hamiltonian, by allowing 1p-1h excitations to fp-shell orbitals. The results suggest that single-neutron excitations to the 0f7/2 orbital play a significant role at high spin.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF); UK Science and Technology Facilities Council; RIKEN; STFC
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 1039509
• Report Number(s): ANL/PHY/JA-66613; NUPABL; TRN: US1202158
• Journal Information: Nuclear Physics, A, Vol. 847, Issue 3-4; ISSN 0375-9474
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DECAY
ENERGY LEVELS
NUCLEAR REACTIONS
SPIN