Spectroscopy of 39,41Si and the border of the N=28 island of inversion
- Sohler, D.
- Grévy, S.
- Dombrádi, Zs.
- Sorlin, O.
- Gaudefroy, L.
- Bastin, B.
- Achouri, N.L.
- Angélique, J.C.
- Azaiez, F.
- Baiborodin, D.
- Borcea, R.
- Bourgeois, C.
- Buta, A.
- Burger, A.
- Caceres, L.
- Chapman, R.
- Dalouzy, J.C.
- Dlouhy, Z.
- Drouard, A.
- Elekes, Z.
- Franchoo, S.
- Iacob, S.
- Kuti, I.
- Laurent, B.
- Lazar, M.
- Liang, X.
- Liénard, E.
- Lukyanov, S.M.
- Mrazek, J.
- Nalpas, L.
- Negoita, F.
- Nowacki, F.
- Orr, N.A.
- Penionzkhevitch, Yu.E.
- Podolyák, Zs.
- Pougheon, F.
- Poves, A.
- Roussel-Chomaz, P.
- Stanoiu, M.
- Stefan, I.
- St-Laurent, M.G.
Publication date
September 2011
DOI Publisher
Elsevier B.V. Published by Elsevier B.V.Abstract
AbstractThe 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
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