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Phys. Rev. Lett. 92, 072502 (2004) [4 pages]

Lowest Excitations in 56Ti and the Predicted N=34 Shell Closure

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S. N. Liddick1,2, P. F. Mantica1,2, R. V. F. Janssens3, R. Broda4, B. A. Brown1,5, M. P. Carpenter3, B. Fornal4, M. Honma6, T. Mizusaki7, A. C. Morton1, W. F. Mueller1, T. Otsuka8, J. Pavan9, A. Stolz1, S. L. Tabor9, B. E. Tomlin1,2, and M. Wiedeking9
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
4Niewodniczanski Institute of Nuclear Physics, PL-31342 Cracow, Poland
5Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
6Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima 965-8580, Japan
7Institute of Natural Sciences, Senshu University, Higashimita, Tama, Kawasaki, Kanagawa 214-8580, Japan
8Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan and RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan
9Department of Physics, Florida State University, Tallahassee, Florida 32306, USA

Received 9 September 2003; published 20 February 2004

Recent experimental characterization of the subshell closure at N=32 in the Ca, Ti, and Cr isotones has stimulated shell-model calculations that indicated the possibility that the N=34 isotones of these same elements could exhibit characteristics of a shell closure, namely, a high energy for the first excited 2+ level. To that end, we have studied the decay of 56Sc produced in fragmentation reactions and identified new γ rays in the daughter N=34 isotone 56Ti. The first 2+ level is found at an energy of 1127 keV, well below the expected position that would indicate the presence of an N=34 shell closure in 56Ti.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.072502
DOI:
10.1103/PhysRevLett.92.072502
PACS:
23.40.–s, 21.60.Cs, 23.20.Lv, 27.40.+z
 
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