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HK: Hadronen und Kerne
HK 63: Spectroscopy: 180 ≤ A ≤ 208
HK 63.3: Talk
Thursday, March 19, 1998, 14:30–14:45, D
Search for K-Isomers in Neutron-Rich Isotopes arround 198Pt⋆ — •Ch. Schlegel1, J. Gerl1, M. Kaspar1, A. Kleinb"ohl1, I. Peter1, M. Rejmund1, H. Schaffner1, S. Wan1, H.J. Wollersheim1, Th. Kr"oll2, D. Cullen3, A. Lundt3, P. Nolen3, S. Shepard3, Y. le Coz4, W. Korten4, and R. Lucas4 — 1GSI, D-64291 Darmstadt — 2Department of Physics Uni. of Padova — 3Nuclear Physics Division of Uni. Liverpool — 4Nuclear Physics Department of Orsay
Studies of the high-K isomers in the A∼ 180 region have
uncovered the existence of direct branches to the low-K rotational bands with
unexpectly large transition probabilities. Two mechanism suggested for such
transitions include coriolis mixing of different K values and
γ-tunneling through an energy barrier in a triaxial landscape.
The most spectacular examples of K-isomerism are, however, predicted to lie
just to the neutron-rich side of the valley of stability.
To investigate the role of the different approaches for K-forbidden transitions
we performed a deep-inelastic reaction using a 208Pb beam of 6.6 MeV/u
onto a thick enriched 198Pt target.
With two large segmented Clover detectors
γ−γ in beam and γ−γdelayed coincidences were taken
to determine the level structure.
The experiment covered an extended range of half-lives and first results will be presented.
Work supported by GSI.