Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Kernphysik / Spektroskopie

HK 46.2: Vortrag

Donnerstag, 15. März 2007, 14:30–14:45, B

g-factor measurements in neutron-rich Sn isotopes using relativistic isomeric beams produced by U-fission at Rising, GSI — •Gabriela Elena Ilie for the g-RISING collaboration — IKP, University of Koln, Koln, Germany — NIPNE, Bucharest, Romania

Measurements of the magnetic moments of excited nuclear states can be sensitive probes of nuclear wave functions, and can allow a detailed comparison with those obtained from theoretical models. The isomeric g-factors were measured using the Time-Differential Perturbed Angular Distribution method. The nuclei of interest were produced in a relativistic fission reaction of ²³⁸U beam with 750 MeV per nucleon, provided by the SIS synchrotron at GSI, impinging on a thin Be target. The fission fragments of interest were produced in this reaction were then separated and identified using the FRagment Separator (FRS). The FRS spectrometer is equipped with standard detection equipment which allows the selection of the fully stripped fragments. The final reaction products were stopped in a Cu plate which was placed between the poles of an electromagnet, providing a hyperfine perturbation-free environment for the implanted isomers. After implantation the nuclei of interest were identified based on event-by-event time correlation between the ions and the delayed γ-rays de-exciting the isomers. The γ ray de-exciting the isomeric levels were detected with eight Cluster Ge detectors mounted in a ring in the horizontal plane. An overview of the experimental technique will be given and results of the experiment will be reported. Work supported by BMBF grant 06 KY 205I.