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HK: Physik der Hadronen und Kerne

HK 28: Kernphysik / Spektroskopie IV

HK 28.1: Gruppenbericht

Donnerstag, 23. März 2000, 16:30–17:00, B 68

Investigation of K-isomers via projectile fragmentation in the mass 180 region — •P. Mayet¹, J. Gerl¹, P.H. Regan², M. Hellström³, M. Pfützner⁴, C. Schlegel¹, and Zs. Podolyák² — ¹GSI, Planckstrasse 1, D-64291 Darmstadt, Germany — ²Dept. of Physics, University of Surrey, Guildford, GU2 5XH, UK — ³Div. of Cosmic and Subatomic Physics, Lund University, SE-22100, Sweden — ⁴Institute of Experimental Physics, Warsaw University, Pl-00861 Warsaw, Poland

Gamma-spectroscopy methods have been used to search for microsecond isomers among the fragmentation products of a 1 GeVnucleon ²⁰⁸Pb beam. In particular the population of the known K=352- isomer in ¹⁷⁹W has been investigated and several new isomeric decays have been found for neutron rich nuclei in the A=180-200 mass region. The ground state band of the neutron rich N=116 system of ¹⁹⁰W has been identified for the first time and we discuss its structure in comparism to neighbouring systems.