Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.54: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Lifetime measurements of intermediate spin states in ¹³³Sb by fast-timing technique — •Dan Gabriel Ghita¹, Henryk Mach^2,3, Ulli Koester⁴, and Gary Simpson⁴ — ¹Horia Hulubei National Institute for Physics and Nuclear Engineering, Magurele, Ilfov 077125, Romania — ²Institute for Structure and Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46616, USA — ³Department of Nuclear and Particle Physics, Uppsala University, P. O. Box 535, S-75121 Uppsala, Sweden — ⁴Institut Laue Langevin, Grenoble, France

Recent developments of the fast-timing setup at Lohengrin ILL Grenoble, by using high performance LaBr₃(Ce) scintillators and a new ionisation chamber, significantly improved the precision of lifetime measurements. In the present work we investigate the ¹³³Sb nucleus, by employing the new experimental setup. The ¹³³Sb nucleus has just one proton outside the doubly magic ¹³²Sn and it is an excellent test ground for the nuclear shell model. A 17 microsecond isomer was previously observed in this nucleus. Measurements of the lifetimes of the states below this isomer allows not only to verify the multipolarity of the transitions, but also to establish the level scheme. Furthermore, the lifetimes extracted from our experiment allows to test various shell model calculations which should be able to accurately predict lifetimes of the states for this simple nucleus.