Cross-shell excitations near the "island of inversion": Structure of Mg-30

A. N. Deacon, J. F. Smith, S. J. Freeman, R. V. F. Janssens, M. P. Carpenter, B. Hadinia, C. R. Hoffman, B. P. Kay, T. Lauritsen, C. J. Lister, David O'Donnell, J. Ollier, T. Otsuka, D. Seweryniak, K. -M. Spohr, D. Steppenbeck, S. L. Tabor, V. Tripathi, Y. Utsuno, P. T. WadyS. Zhu

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20 Citations (Scopus)

Abstract

Excited states in Mg30 have been populated to ~6ℏ and 5 MeV excitation energy with the C14(O18,2p) reaction. Firm spin assignments for states with J>2ℏ have been made in this nucleus. The level scheme is compared to shell-model calculations using the Universal sd effective interaction and the Monte Carlo shell model method. Calculations employing a full sd model space fail to reproduce the observed levels. The results indicate that excitations across the N=20 gap are required at relatively low excitation energy to achieve a description of the data. The incorporation of the f7/2 and p3/2 orbitals into the model space gives improved results but indicate the need for further refinement of the models to reproduce the observed spectra.
Original languageEnglish
Article number034305
JournalPhysical Review C
Volume82
Issue number3
DOIs
Publication statusPublished - 7 Sep 2010

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