Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 16: Kernphysik/Spektroskopie II

HK 16.6: Talk

Tuesday, March 18, 2003, 17:15–17:30, A

Isomer Spectroscopy of Exotic Nuclei around Mass 180 — •Samit Mandal — Gesellschaft für Schwerionenforschung, Darmstadt, Germany.

Isomer spectroscopy is a powerful method to investigate the shape coexistence in different regions of the nuclear chart. A competition between the deformed (K-isomer) and the spherical (seniority isomer) shape is also a phenomena in these regions. Neutron-deficient lead isotopes close to the neutron mid-shell (N∼104) have a particular importance and different intrinsic shapes have been predicted[1]. In our present experiment we have investigated new K-isomers in the proton rich Pb region to study the shape coexistence using the fragmentation reactions with a ²³⁸U beam.

A primary beam of ²³⁸U, 900 MeV/u was used to produce the exotic nuclei by bombarding on a primary target of 1 g/cm² thick Be. The fragments were transported through GSI’s FRagment Separator (FRS) and stopped in a plastic catcher at the fourth focus of the FRS. Time-of-flight along with Bρ-ΔE-Bρ method was used for identification of different nuclei at the final focus. Six segmented clover detectors including two GSI super clovers were placed around the catcher in a closed geometry to record the de-exciting γ-rays from the isomeric state of the nuclei of interest. Several well known and newly discovered isomers were observed during online analysis. Final analysis is in progress and results will be presented during the meeting.

[1] W. Nazarewicz, Phys. Lett. B305(1993) 195.