Lifetime measurement of the 21+ state in C20

M. Petri*, P. Fallon, A. O. MacChiavelli, S. Paschalis, K. Starosta, T. Baugher, D. Bazin, L. Cartegni, R. M. Clark, H. L. Crawford, M. Cromaz, A. Dewald, A. Gade, G. F. Grinyer, S. Gros, M. Hackstein, H. B. Jeppesen, I. Y. Lee, S. McDaniel, D. MillerM. M. Rajabali, A. Ratkiewicz, W. Rother, P. Voss, K. A. Walsh, D. Weisshaar, M. Wiedeking, B. A. Brown

*Corresponding author for this work

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Establishing how and when large N/Z values require modified or new theoretical tools is a major quest in nuclear physics. Here we report the first measurement of the lifetime of the 21+ state in the near-dripline nucleus C20. The deduced value of τ21+=9.8±2.8(stat)-1.1+0.5(syst)ps gives a reduced transition probability of B(E2;21+→0g.s.+)=7.5-1.7+3. 0(stat)-0.4+1.0(syst)e2fm4 in good agreement with a shell model calculation using isospin-dependent effective charges.

Original languageEnglish
Article number102501
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 30 Aug 2011

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