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 Daugas⁴ — ¹IKP, 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.