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Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Struktur und Dynamik von Kernen

HK 32.2: Talk

Wednesday, March 21, 2012, 17:00–17:15, RW 3

First observation of isomeric state in 97Rb — •Matthias Rudigier1, Andrey Blazhev1, Jean-Marc Regis1, Nigel Warr1, Jan Jolie1, Christoph Fransen1, Matthias Hackstein1, Michael Pfeiffer1, Wolfram Rother1, Tim Thomas1, Gary Simpson2, Mourad Ramdhane2, Ulli Köster3, Thomas Materna3, Waldemar Urban3, and Jean-Michel Daugas41IKP, Uni Köln, Germany — 2LPSC, Grenoble, France — 3ILL, Grenoble, France — 4CEA, DAM, DIF, Arpajon, France

Data on a new microsecond isomer in 97Rb will be presented. The measurement was conducted at the LOHENGRIN mass separator at the ILL, Grenoble. We were able to deduce the level energy and lifetime of the state. The multipolarity of the transition to the ground state was determined using conversion electron spectroscopy. This information enabled us to assign a spin and parity to the state, based on quasi-partice-rotor model calculations. The nucleus 97Rb has neutron number 60, and is thus situated in the shape-phase transition line of the mass 100 nuclei. It will be discussed how the new state fits into the region and the Rb-isotopic chain. Furthermore some new results on the decay of the 9/2+ microsecond isomer of 97Sr will be presented and discussed.

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