Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Physics/Spectroscopy

HK 10.8: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Transition Matrix Elements in Neutron-rich Fission Fragments — •C. Hutter^1,2, R. Krücken¹, J.R. Cooper^1,3, C.J. Barton¹, C.W. Beausang¹, M. Caprio¹, R.F. Casten¹, W.-T. Chou¹, A.A. Hecht¹, N. Pietralla^1,4, N.V. Zamfir¹, A. Aprahamian⁵, M. Shawcross⁵, D. Cline⁶, C.Y. Wu⁶, K.E. Gregorich⁷, R.M. Clark⁷, A.O. Macchiavelli⁷, M. Stoyer³, and A. Zilges² — ¹WNSL-Yale University — ²Institut für Kernphysik, Technische Universität Darmstadt — ³Lawrence Livermore National Laboratory — ⁴Institut für Kernphysik, Universität zu Köln — ⁵Notre Dame University — ⁶University of Rochester — ⁷Lawrence Berkeley National Laboratory

In view of the prospects of studying neutron-rich nuclei far from stability using RIBs it is important to get structural information on those nuclei already accessible today by means of spectroscopy following fission. The systematic knowledge of transition matrix elements in these nuclei is key to observe modifications off the shell structure of nuclei far from stability. In this contribution we report on a recoil distance Doppler shift experiment using Gammasphere and the New Yale Plunger Device to measure lifetimes of excited states in neutron rich nuclei produced in the fission of ²⁵²Cf. Fission fragments emitted in a cone of ± 20^∘ from a thin 50 µCi ²⁵²Cf source were detected by a set of photo cells. Complementary fragments were stopped in a gold stopper after traveling a variable distance. Gamma rays in coincidence with fission fragments were detected by the Gammasphere array. First results for A≈ 100 and 140 nuclei will be presented. Supported by the U.S. DOE (DE-FG02-91ER-40609) and NSF, and the German DFG under contract No. Pi 393/1.