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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).


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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
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
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.
Poves, A.
Date : 12 July 2007
DOI : 10.1103/PhysRevLett.99.022503
Additional Information : Published in Physical Review Letters, 99, 022503 (2007). © 2007 The American Physical Society.
Depositing User : Mr Adam Field
Date Deposited : 27 May 2010 14:08
Last Modified : 31 Oct 2017 13:57

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