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"High spin structure and intruder configurations in 31P"
M. Ionescu-Bujor, A. Iordachescu, D.R. Napoli, S.M. Lenzi, N. Mãrginean, T. Otsuka, Y. Utsuno, R.V. Ribas, M. Axiotis, D. Bazzacco, A.M. Bizzeti-Sona, P.G. Bizzeti, F. Brandolini, D. Bucurescu, M.A. Cardona, G. de Angelis, M. De Poli, F. Della Vedova, E. Farnea, A. Gadea, D. Hojman, C.A. Kalfas, Th. Kröll, S. Lunardi, T. Martínez, P. Mason, P. Pavan, B. Quintana, C. Rossi Alvarez, C.A. Ur, R. Vlastou and S. Zilio
Phys. Rev. C 73(2) (2006) 024310/1-12
Abstract
The nucleus 31P has been studied in the 24Mg(16O,2αp) reaction with a 70-MeV 16O beam. A complex level scheme extended up to spins 17/2+ and 15/2-, on positive and negative parity, respectively, has been established. Lifetimes for the new states have been investigated by the Doppler shift attenuation method. Two shell-model calculations have been performed to describe the experimental data, one by using the code ANTOINE in a valence space restricted to the sd shell, and the other by applying the Monte Carlo shell model in a valence space including the sd-fp shells. The latter calculation indicates that intruder excitations, involving the promotion of a T=0 proton-neutron pair to the fp shell, play a dominant role in the structure of the positive-parity high-spin states of 31P.
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