Measurement of excited states in Si40 and evidence for weakening of the N=28 shell gap

C. M. Campbell, N. Aoi, D. Bazin, M. D. Bowen, B. A. Brown, J. M. Cook, D. C. Dinca, A. Gade, T. Glasmacher, M. Horoi, S. Kanno, T. Motobayashi, W. F. Mueller, H. Sakurai, K. Starosta, H. Suzuki, S. Takeuchi, J. R. Terry, K. Yoneda, H. Zwahlen

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Abstract

Excited states in Si40 have been established by detecting I rays coincident with inelastic scattering and nucleon removal reactions on a liquid hydrogen target. The low excitation energy, 986(5)AkeV, of the 21+ state provides evidence of a weakening in the N=28 shell closure in a neutron-rich nucleus devoid of deformation-driving proton collectivity.

Original languageEnglish
Article number112501
JournalPhysical Review Letters
Volume97
Issue number11
DOIs
StatePublished - 2006

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