Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 16: Nuclear Structure/Spectroscopy II

HK 16.10: Vortrag

Dienstag, 9. März 2004, 18:15–18:30, A

Microsecond Isomers in the Heavy Indium Isotopes — •A. Scherillo^1,2, J. Pinston³, J. Genevey³, G.S. Simpson², H. Faust², and J. Jolie¹ — ¹Insitut für Kernphysik, Universität zu Köln, Köln, Germany — ²ILL, Grenoble, France — ³LPSC, Grenoble, France

To extend our knowledge on the structure of the heavy Indium isotopes, which is very scarse, their microsecond isomers were investigated. These nuclei were produced by thermal-neutron-induced fission of ²³⁹Pu and ²⁴¹Pu, and separeted using the LOHENGRIN spectrometer at ILL (Grenoble). The detection system was based on the time correlation between the incoming fission fragment and the γ-rays or conversion electrons emitted by the isomer. The decay schemes of the new yrast isomers in ^{129, 128, 127, 125, 123}In are presented. The experimental results were found to be in good agreement with a semi-empirical shell model calculation. A truncated configuration space was used, including only the orbitals π g_9/2 for the protons and ν s_1/2, ν d_3/2 and ν h_11/2 for the neutrons. The two-body matrix elements of the residual interaction were extracted, wherever possible, from experimental data.

This work was supported by ILL and by the BMBF under research grant 06K-167/TP2.