Journal
PHYSICS LETTERS B
Volume 703, Issue 4, Pages 417-421Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2011.08.004
Keywords
Nuclear structure; Knockout reactions; Shell closures; Neutron-rich Si nuclei
Funding
- EC through the Eurons [RII3-CT-3/2004-506065]
- OTKA [K68801]
- TeT [FR-9/2009]
- BMBF [06BN109]
- Czech Republic [GA 202/040791]
- Dubna-IN2P3
- Bolyai Janos Foundation
- Spanish Ministry of Education and Science [FPA2009-13377]
- Comunidad de Madrid (Spain)
- HEPHACOS [S2009/ESP-1473]
- CICyT(Spain) [IN2P3(France)]
- [RFFI-09-02-91056]
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The structure of the very neutron-rich nuclei Si-39 and Si-41 has been investigated via in-beam gamma-ray spectroscopy and few-nucleon knockout from radioactive beams. The observation of low-lying states in Si-39 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 gamma-ray transition (672(14) keV) observed in Si-41 is significantly lower than that of the first excited state in Ca-47 (2014 keV) suggesting a deformed ground state for Si-41. 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. (C) 2011 Elsevier By. All rights reserved.
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