Observation of a new high-spin isomer in 94Pd

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. 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. 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, H. Weick, H.J. Wollersheim, P. Woods

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20 Citations (Scopus)


A second γ-decaying high-spin isomeric state, with a half-life of 197(22)ns, has been identified in the N=Z+2 nuclide 94Pd 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 (p1/2, g9/2) 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 f5/2 and p3/2 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 100Sn 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 (πp−11/2g−39/2)11⊗(νg−29/2)8. The half-life of the known, 14+, isomer was remeasured and yielded a value of 499(13) ns.
Original languageEnglish
Article number061309
JournalPhysical Review C
Issue number6
Publication statusPublished - 30 Dec 2010
Externally publishedYes


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