Yrast and near-yrast states in Al-30 and Si-30 have been populated to high spin with the O-18+ C-14 fusion-evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J similar to 9h 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 W BP 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 0f(7/2) orbital play a significant role at high spin. (C) 2010 Elsevier B.V. All rights reserved.
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