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HK: Hadronen und Kerne

HK 42: Kernspektroskopie, mittelschwere Kerne II

HK 42.3: Group Report

Wednesday, March 26, 1997, 15:00–15:30, HS E

Identification of T_z=1 nuclei close to ¹⁰⁰Sn — •M. Górska^1,2, M. Lipoglavšek^3,4, H. Grawe^1,5, and J. Nyberg³ — ¹GSI Darmstadt — ²Institute of Experimental Physics, Uniwersity of Warsaw, Warsaw, Poland — ³Svedberg Laboratory and Department of Radiation Sciences, Uppsala University, Uppsala, Sweden — ⁴J. Stefan Institute, Ljubljana, Slovenia — ⁵Hahn-Meitner Institute, Berlin, Germany

Excited states in the two quasi–particle neighbours of ¹⁰⁰Sn – ⁹⁸Cd and ¹⁰²Sn – were identified for the first time following fusion evaporation reactions. Half lives of long lived seniority isomers were measured in both nuclei. Due to the very low cross section for producing ⁹⁸Cd and ¹⁰²Sn with stable beams and targets, a special detector setup utilizing NORDBALL ancillary detectors and a recoil catcher device were used together with two EUROBALL Ge cluster detectors. A surprisingly small proton E2 polarization charge is found. The striking simmilarity of the shell structure of ⁵⁶Ni and ¹⁰⁰Sn allows conclusions on core excited states in ¹⁰⁰Sn. Experimental results are discussed in the framework of shell model calculations.