Collapse of the N=28 shell closure in 42Si

被引：285

作者：

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.

Buerger, 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.

机构：

[1] GANIL, CEA, DSM, CNRS INP2P3, F-14076 Caen, France

[2] Phys Corpusculaire Lab, F-14050 Caen, France

[3] Inst Nucl Res, H-4001 Debrecen, Hungary

[4] CNRS, IN2P3, Inst Nucl Phys, F-91406 Orsay, France

[5] AS CR, Inst Nucl Phys, CZ-25068 Rez, Czech Republic

[6] CEA Saclay, DAPNIA SPhN, F-91191 Gif Sur Yvette, France

[7] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[8] Univ Paisley, Sch Sci & Engn, Paisley PA1 2BE, Renfrew, Scotland

[9] Joint Inst Nucl Res Dubna, FLNR, Dubna 141980, Russia

[10] Univ Surrey, Guildford GU2 7XH, Surrey, England

[11] IReS, F-67037 Strasbourg, France

[12] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevLett.99.022503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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