Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 58: Nuclear Structure and Dynamics I
HK 58.3: Talk
Wednesday, March 18, 2009, 17:15–17:30, H-ZO 40
Yrast structure of 97Zr . — •Magdalena Matejska-Minda1, Bogdan Fornal1, Rafał Broda1, M.P. Carpenter2, R.V.F. Janssens2, W. Królas1, K. Mazurek1, T. Pawłat1, J. Wrzesinski1, and S. Zhu2 — 1Institute of Nuclear Physics, Polish Academy of Sciences, Kraków — 2Physics Division, Argonne National Laboratory, Argonne, IL, USA
The experiment performed at the ANL, USA, in which gamma rays emitted during reactions induced by a 48Ca beam on 208Pb and 238U targets were measured, showed that the process of fission of target-like nuclei populate relatively high-spin states in nuclei near 96Zr. One of the intense products was 97Zr for which information on higher lying yrast states was largely missing. We analyzed the spectra of gamma rays that were coincident with the beam pulse, and associated with subsequent detection of transitions deexciting the 7/2+ isomer. In this nucleus a series of gamma rays was displayed as candidates for higher lying transitions. Using those gamma rays as starting points, we identified lines preceding the isomer. These lines were used to extended the yrast states in 97Zr up to the excitation energy of 7294 keV and spin of approximately 33/2. In addition, the identification of high-spin excitations in 97Zr allowed to establish the states fed in the beta-decay branch of the 27/2- high-spin isomer in 97Y. The structure located in the present work will be discussed from the perspective of the shell model.