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Collapse of the N=28 Shell Closure in 42Si

Bastin, B., Grévy, S., Sohler, D., Sorlin, O., Dombrádi, Zs., Achouri, N. L., Angélique, J. C., Azaiez, F., Baiborodin, D., Borcea, R., Bourgeois, C., Buta, A., Bürger, A., Chapman, R., Dalouzy, J. C., Dlouhy, Z., Drouard, A., Elekes, Z., Franchoo, S., Iacob, S., Laurent, B., Lazar, M., Liang, X., Liénard, E., Mrazek, J., Nalpas, L., Negoita, F., Orr, N. A., Penionzhkevich, Y., Podolyák, Zs., Pougheon, F., Roussel-Chomaz, P., Saint-Laurent, M. G., Stanoiu, M., Stefan, I., Nowacki, F. and Poves, A. (2007) Collapse of the N=28 Shell Closure in 42Si Physical Review Letters, 99 (022503). ISSN 0031-9007

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Abstract

The energies of the excited states in very neutron-rich 42Si and 41,43P have been measured using in-beam gamma-ray spectroscopy from the fragmentation of secondary beams of 42,44S at 39A MeV. The low 2+ energy of 42Si, 770(19) keV, together with the level schemes of 41,43P, provides 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 42Si is best described as a well-deformed oblate rotor.

Item Type: Article
Additional Information: Published in Physical Review Letters, 99, 022503 (2007). © 2007 The American Physical Society.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:08
Last Modified: 23 Sep 2013 18:27
URI: http://epubs.surrey.ac.uk/id/eprint/309

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