Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Kernphysik / Spektroskopie

HK 12.9: Vortrag

Dienstag, 13. März 2007, 16:15–16:30, D

Lifetime and g-factor measurements on Coulomb excited ³⁶S beams⁺ — Stefan Schielke¹, Karl-Heinz Speidel¹, •Jörg Leske^1,2, Norbert Pietralla², Tan Ahn², Alin Costin², Oscar Zell³, Shadow JQ Robinson⁴, Alberto Escuderos⁵, Yitzhak Sharon⁵, Larry Zamick⁵, and Jean Gerber⁶ — ¹University of Bonn — ²TU Darmstadt — ³University of Cologne — ⁴University of Southern Indiana, USA — ⁵Rutgers University, USA — ⁶IReS, Strasbourg

In view of recent studies on Ar- [1] and Ca- [2] isotopes indicating significant cross-shell neutron excitations at the N=20 shell gap causing appropriate nucleon configurations in the nuclear wave functions, the g factor of the 2₁⁺ state in semi-magic ³⁶S has been determined for the first time. In addition, the lifetimes of the 2₁⁺ and 3₁⁻ states were redetermined with higher precision, and the g factor of ⁴⁰Ar(2₁⁺) was remeasured. Projectile Coulomb excitation and α transfer reaction in inverse kinematics were combined with transient fields in gadolinium. ³⁶S beams were provided by the Cologne tandem accelerator. The de-excitation γ rays were detected with NaI(Tl) scintillators in coincidence with forward scattered carbon ions using a multilayered target with a thin carbon layer. The experimental data are compared with results from large scale shell model calculations. ⁺ supported by the BMBF and the DFG

[1] K.-H. Speidel et al., Phys. Lett. B 632 (2006) 207

[2] S. Schielke et al., Phys. Lett. B 571 (2003) 29