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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Kernphysik / Spektroskopie

HK 36.1: Talk

Wednesday, March 14, 2007, 17:00–17:15, D

g-factor measurements on Coulomb excited radioactive ¹³⁸Xe beams of 2.87 MeV/A at REX-ISOLDE⁺ — •Jörg Leske^1,2, Karl-Heinz Speidel², Andrea Jungclaus³, Stefan Schielke², Roman Gernhäuser⁴, Thorsten Kröll⁴, Peter Maierbeck⁴, Rudi Lutter⁵, Victor Modamio³, Jennifer Walker³, Dimiter Balabanski⁶, Georgi Georgiev⁷, and Jean Gerber⁸ for the REX-ISOLDE collaboration — ¹TU Darmstadt — ²University of Bonn — ³Universidad Autonoma de Madrid — ⁴TU München — ⁵LMU München — ⁶Sofia — ⁷Orsay — ⁸IReS Strasbourg

We report on experiments dedicated to first measurements of magnetic moments of short-lived nuclear states of radioactive beams at the REX-ISOLDE facility. The ultimate goal is to determine g factors of ^132,134,136Te and ¹³⁸Xe isotopes based on intriguing shell model predictions [1]. Due to technical constraints a beam of ¹³⁸Xe was selected as a first case for determining the g factor of the 2₁⁺ state at 0.589 MeV and lifetime τ = 15 ps. Projectile Coulomb excitation in inverse kinematics was combined with transient fields in gadolinium. Two different targets were used with excitation layers of pure ⁵⁰Ti or natural Al on Gd with Cu backings. The de-excitation γ rays were detected by four modules of MINIBALL detectors in coincidence with forward scattered target ions registered in a four-fold Si detector array placed symmetric to the beam axis. A hole in the detector plate allowed to pass the emerging beam to a downstream Faraday cup. Experiences and results are discussed in detail. ⁺ supported by the BMBF and CERN [1] J. Terasaki et al., Phys. Rev. C 66 (2002) 054313