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Physics Letters B 703 (2011) 417-421
Spectroscopy of 39,41Si and the border of the N = 28 island of inversion
D. Sohler, S. Grévy1, 2, Zs. Dombrádi, O. Sorlin1, L. Gaudefroy3, B. Bastin1, N.L. Achouri4, J.C. Angélique4, F. Azaiez5, D. Baiborodin, R. Borcea, C. Bourgeois5, A. Buta, A. Burger, L. Caceres1, R. Chapman, J.C. Dalouzy1, Z. Dlouhy, A. Drouard6, Z. Elekes, S. Franchoo5, S. Iacob, I. Kuti, B. Laurent4, M. Lazar, X. Liang, E. Liénard4, S.M. Lukyanov, J. Mrazek, L. Nalpas6, F. Negoita, F. Nowacki7, N.A. Orr4, Yu.E. Penionzkhevitch, Zs. Podolyák, F. Pougheon5, A. Poves, P. Roussel-Chomaz1, M. Stanoiu, I. Stefan5, M.G. St-Laurent1

The structure of the very neutron-rich nuclei 39Si and 41Si has been investigated via in-beam γ -ray spectroscopy and few-nucleon knockout from radioactive beams. The observation of low-lying states in 39Si is a clear evidence for a drastic lowering of the intruder neutron 3/2− state when going from Z = 20 to Z = 14. The energy of the only γ -ray transition (672(14) keV) observed in 41Si is significantly lower than that of the first excited state in 47Ca (2014 keV) suggesting a deformed ground state for 41Si. These results are consistent with large-scale shell-model calculations implying that strong proton- neutron correlations are the main reason for the lowering of the intruder configurations over the normal ones.
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
2 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
3 :  DAM/DIF - DAM Île-de-France
4 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
5 :  IPNO - Institut de Physique Nucléaire d'Orsay
6 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
7 :  IPHC - Institut Pluridisciplinaire Hubert Curien
structure nucléaire
Physique/Physique Nucléaire Expérimentale
Nuclear structure – Knockout reactions – Shell closures – Neutron-rich Si nuclei