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Spectroscopy of 39,41Si and the border of the N = 28 island of inversion

Abstract : 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.
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Contributor : Michel Lion <>
Submitted on : Tuesday, September 6, 2011 - 10:43:03 AM
Last modification on : Friday, December 4, 2020 - 9:42:02 AM

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D. Sohler, S. Grévy, Zs. Dombrádi, O. Sorlin, L. Gaudefroy, et al.. Spectroscopy of 39,41Si and the border of the N = 28 island of inversion. Physics Letters B, Elsevier, 2011, 703, pp.417-421. ⟨10.1016/j.physletb.2011.08.004⟩. ⟨in2p3-00619310⟩



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