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Collapse of the N=28 Shell Closure in Si-42

Bastin, B, Grevy, S, Sohler, D, Sorlin, O, Dombradi, Z, 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, Z, Pougheon, F, Roussel-Chomaz, P, Saint-Laurent, M G, Staniou, M, Stefan, I, Nowacki, F and Poves, A (2007) Collapse of the N=28 Shell Closure in Si-42 Physical Review Letters, 99 (2).

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Abstract

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

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Bastin, B
Grevy, S
Sohler, D
Sorlin, O
Dombradi, Z
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, Zz.podolyak@surrey.ac.uk
Pougheon, F
Roussel-Chomaz, P
Saint-Laurent, M G
Staniou, M
Stefan, I
Nowacki, F
Poves, A
Date : 1 January 2007
Identification Number : 10.1103/PhysRevLett.99.022503
Additional Information : Published in <i>Physical Review Letters,</i> Vol. 99, Iss. 2. Copyright 2007 American Physical Society. Click <a href=http://prl.aps.org/>here</a> to access the journal's website.
Depositing User : Mr Adam Field
Date Deposited : 27 May 2010 14:06
Last Modified : 31 Oct 2017 13:57
URI: http://epubs.surrey.ac.uk/id/eprint/186

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