Measurement of Excited States in Si 40 and Evidence for Weakening of the N = 28 Shell Gap
2006; American Physical Society; Volume: 97; Issue: 11 Linguagem: Inglês
10.1103/physrevlett.97.112501
ISSN1092-0145
AutoresC. M. Campbell, N. Aoi, D. Bazin, M. D. Bowen, B. A. Brown, J. M. Cook, D.‐C. Dinca, A. Gade, T. Glasmacher, Mihai Horoi, S. Kanno, T. Motobayashi, W. F. Mueller, H. Sakuraï, K. Starosta, Hiroaki Suzuki, Satoshi Takeuchi, J. R. Terry, K. Yoneda, Helmut T. Zwahlen,
Tópico(s)Atomic and Molecular Physics
ResumoExcited states in $^{40}\mathrm{Si}$ have been established by detecting $\ensuremath{\gamma}$ rays coincident with inelastic scattering and nucleon removal reactions on a liquid hydrogen target. The low excitation energy, 986(5) keV, of the ${2}_{1}^{+}$ state provides evidence of a weakening in the $N=28$ shell closure in a neutron-rich nucleus devoid of deformation-driving proton collectivity.
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