/ Experiment-Nucl arXiv:0705.4526

Collapse of the N=28 shell closure in Si-42

Bastin, B. ; Grevy, S. ; Sohler, D. ; Sorlin, O. ; Dombradi, Zs. ; Achouri, N.L. ; Angelique, J.C. ; Azaiez, F. ; Baiborodin, D. ; Borcea, R. ; Bourgeois, C. ; Buta, A. ; Burger, A. ; Chapman, R. ; Dalouzy, J.C. ; Dlouhy, Z. ; Drouard, A. ; Elekes, Z. ; Franchoo, S. ; Iacob, S. ; Laurent, B. ; Lazar, M. ; Liang, X. ; Lienard, E. ; Mrazek, J. ; Nalpas, L. ; Negoita, F. ; Orr, N.A. ; Penionzhkevich, Y. ; Podolyak, Zs. ; Pougheon, F. ; Roussel-Chomaz, P. ; Saint-Laurent, M.G. ; Stanoiu, M. ; Stefan, I. ; Nowacki, F. ; Poves, A.

Published in: Phys.Rev.Lett.
Year: 2007
Vol.: 99
Page No: 022503
Pages: 4

Abstract: The energies of the excited states in very neutron-rich $^{42}$Si and $^{41,43}$P have been measured using in-beam $\gamma$-ray spectroscopy from the fragmentation of secondary beams of $^{42,44}$S at 39 A.MeV. The low 2$^+$ energy of $^{42}$Si, 770(19) keV, together with the level schemes of $^{41,43}$P provide evidence for the disappearance of the Z=14 and N=28 spherical shell closures, which is ascribed mainly to the action of proton-neutron tensor forces. New shell model calculations indicate that $^{42}$Si is best described as a well deformed oblate rotor.

Web-Page: http://link.aps.org/abstract/PRL/V99/E022503

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