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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Kernphysik / Spektroskopie

HK 29.3: Talk

Tuesday, March 11, 2008, 11:45–12:00, 2G

g-factor measurement and spin-alignment of the 7⁻ isomer in ¹²⁶Sn produced in relativistic fission — •Gabriela Ilie^1,2, Jan Jolie¹, Gerda Neyens³, and Gary Simpson⁴ for the g-Rising collaboration — ¹IKP der Universität zu Köln, Köln, Germany — ²IFIN-HH, Bucharest, Romania — ³IKS, Katholieke Universiteit Leuven, Belgium — ⁴LPSC, 38026 Grenoble Cedex, France

The g factor is one of the important properties of a nucleus and is a very useful quantity to characterise the state of the nucleus. The g factor is the ratio of the magnetic moment to the angular momentum of the state and is known to be a sensitive probe of the nuclear wave function. The isomeric 7⁻ state in ¹²⁶Sn at 2.2 MeV with a half-life of T_1/2=6.6(14) µs [1] has been studied in a relativistic fission reaction with a ²³⁸U beam of 750 MeV per nucleon, provided by the SIS synchrotron at GSI, impinging on a thin Be target. The projectile fragments were separated by the GSI FRagment Separator (FRS) and identified unambiguously by means of their magnetic rigidity, time of flight and energy loss. 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. The stopper was viewed by a γ-array of EUROBALL Cluster detectors. The de-excitation γ rays were measured in coincidence with the ions. The status of the experimental analysis, results and a discussion of the structure based on the systematics of the other even-even Sn isotopes will be presented. Work supported by BMBF grant 06 KY205I. [1] B.Fogelberg et al., Nucl. Phys. A323, 205 (1979).