Observation of a new high-spin isomer in Pd-94

RISING Collaboration, T. S. Brock, B. S. Nara Singh, P. Boutachkov, N. Braun, A. Blazhev, Z. Liu, R. Wadsworth, M. Gorska, H. Grawe, S. Pietri, C. Domingo-Pardo, D. Rudolph, S. J. Steer, A. Atac, L. Bettermann, L. Caceres, T. Engert, K. Eppinger, T. FaestermannF. Farinon, F. 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. Kojuharov, R. Kruecken, N. Kurz, E. Merchan, C. Nociforo, J. Nyberg, M. Pfuetzner, A. Prochazka, Zs Podolyak, P. H. Regan, P. Reiter, S. Rinta-Antila, H. Schaffner, C. Scholl, P. -A. Soderstrom, N. Warr, P. J. Woods

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A second gamma-decaying high-spin isomeric state, with a half-life of 197(22) ns, has been identified in the N = Z + 2 nuclide Pd-94 as part of a stopped-beam Rare Isotope Spectroscopic INvestigation at GSI (RISING) experiment. Weisskopf estimates were used to establish a tentative spin/parity of 19(-), corresponding to the maximum possible spin of a negative parity state in the restricted (p(1/2), g(9/2)) model space of empirical shell model calculations. The reproduction of the E3 decay properties of the isomer required an extension of the model space to include the f (5/2) and p(3/2) orbitals using the CD-Bonn potential. This is the first time that such an extension has been required for a high-spin isomer in the vicinity of Sn-100 and reveals the importance of such orbits for understanding the decay properties of high-spin isomers in this region. However, despite the need for the extended model space for the E3 decay, the dominant configuration for the 19(-) state remains (p p(1/2)(-1)g(9/2)(-3))(11)circle times(nu g(9/2)(-2))(8). The half-life of the known, 14(+), isomer was remeasured and yielded a value of 499(13) ns.

Original languageEnglish
Article number061309
Pages (from-to)-
Number of pages5
JournalPhysical Review C
Volume82
Issue number6
DOIs
Publication statusPublished - 30 Dec 2010

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