16(+) Spin-Gap Isomer in Cd-96

B.S. Nara Singh, Z. Liu, R. Wadsworth, H. Grawe, T.S. Brock, P. Boutachkov, N. Braun, A. Blazhev, M. Gorska, S. Pietri, D. Rudolph, C. Domingo-Pardo, S.J. Steer, A. Atac, L. Bettermann, L. Caceres, K. Eppinger, T. Engert, T. Faestermann, F. FarinonF. Finke, K. Geibel, J. Gerl, R. Gernhaeuser, N. Goel, A. Gottardo, J. Grebosz, C. Hinke, R. Hoischen, G. Ilie, H. Iwasaki, J. Jolie, A. Kaskas, I. Kojouharov, R. Kruecken, N. Kurz, E. Merchan, C. Nociforo, J. Nyberg, M. Pfuetzner, A. Prochazka, Zs. Podolyak, P.H. Regan, P. Reiter, S. Rinta-Antila, C. Scholl, H. Schaffner, P.-A. Soderstrom, N. Warr, H. Weick, H.-J. Wollersheim, P.J. Woods, F. Nowacki, K. Sieja

Research output: Contribution to journalArticlepeer-review


A β-decaying high-spin isomer in 96Cd, with a half-life T1/2=0.29+0.11−0.10 s, has been established in a stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of a primary beam of 124Xe on a 9Be target. From the half-life and the observed γ decays in the daughter nucleus,
96Ag, we conclude that the β-decaying state is the long predicted 16+ “spin-gap” isomer. Shell-model calculations, using the Gross-Frenkel interaction and the πν(p1/2,g9/2) model space, show that the isoscalar component of the neutron-proton interaction is essential to explain the origin of the isomer. Core excitations across the N=Z=50 gaps and the Gamow-Teller strength, B(GT) distributions have been studied via large-scale shell-model calculations using the πν(g,d,s) model space to compare with the experimental B(GT) value obtained from the half-life of the isomer.
Original languageEnglish
Article number172502
Number of pages5
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 18 Oct 2011
Externally publishedYes


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