Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Structure and Dynamics of Nuclei XI

HK 58.2: Vortrag

Donnerstag, 17. März 2016, 17:00–17:15, S1/01 A03

Study of multiple isomeric states in ⁹⁵Ag via electron and gamma-ray spectroscopy — •Kevin Moschner¹, Andrey Blazhev¹, Plamen Boutachkov², Paul Davies³, Magda Górska², Hubert Grawe², Robert Wadsworth³, and Nigel Warr¹ — ¹Institut für Kernphysik - Universität zu Köln — ²GSI Darmstadt — ³Department of Physics, University of York

Recently, we studied isomeric decays of ⁹⁵Ag at the RIKEN Nishina Center using a fragmentation reaction of ¹²⁴Xe on a ⁹Be target. The separated and identified reaction products were implanted in the modified SIMBA Silicon calorimeter, which was surrounded by the EURICA Germanium array, to measure the isomer and particle decays. The half-lives of all three isomeric states previously identified by Döring [Phys. Rev. C 68, 034306 (2003)] were measured from the analysis of the gamma-ray and conversion-electron (CE) data. Analysis of coincident gamma-rays and CE-gamma-ray data was used to verify the published level scheme. We have performed new shell-model calculations in a larger model space pn(f_5/2, p_3/2, p_1/2, g_9/2) using a modified interaction. These calculations provide an improved description of the isomers and the reduced transition rates extracted from the experimental half-lives. While for the isomeric states (1/2⁻) and (23/2⁺) the choice of E3 for the depopulating transitions is appropriate, the comparison of the shell-model to the experimental results is used as a basis to suggest a change of the spin and parity assignment of the high-spin isomer in with the former assignment of (37/2⁺).