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HK: Physik der Hadronen und Kerne

HK 7: Kern- und Teilchen-Astrophysik I

HK 7.12: Vortrag

Montag, 17. März 2003, 19:00–19:15, F

Probing the structure of neutron-rich In and Cd nuclei with isomer spectroscopy — •M. Hellström¹, M.N. Mineva², A. Blazhev¹, H.J. Boardman³, J. Ekman², K. Gladnishki⁴, H. Grawe¹, J. Gerl¹, R. Page³, Zs. Podolyák⁴, and D. Rudolph² — ¹GSI Darmstadt, Germany — ²Lund University, Sweden — ³University of Liverpool, UK — ⁴University of Surrey, UK

Heavy-ion tagged decay spectroscopy of isomeric states, produced directly in e.g. projectile fragmentation or fission of relativistic heavy ions and long-lived enough to survive the transport to the final focal plane of a fragment separator, offers unique possibilities for spectroscopy studies of nuclear systems at the limits.

The method is an ideal complement to β-decay and in-beam experiments, which often require higher count rates. From the isomer decay patterns and the strengths of the predominant isomeric transitions properties such as single-particle energies, residual interaction strength, shell occupation and development of collectivity can be extracted. In addition, intermediate levels between the isomer and the ground state are often populated in the decay, and can thus also be studied.

We will report on the results of recent experiments performed at GSI-Darmstadt, where we searched for and studied relatively long-lived (0.1-100.0 µs) isomeric states in nuclei close to doubly magic ¹³²Sn, produced in fission of 732 AMeV ²³⁸U on a Pb target. New and previously known isomers in neutron-rich cadmium and indium nuclei will be discussed.