Erlangen 2001 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 37: Kernphysik/Spektroskopie V - Isomere, g-Faktoren und Massen

HK 37.2: Talk

Wednesday, March 21, 2001, 17:00–17:15, D

A new g factor measurement of the 2₁⁺ state in ⁵⁴Cr and its shell model interpretation including ⁵⁰Cr and ⁵²Cr ⁺ — •S. Wagner¹, K.-H. Speidel¹, O. Kenn¹, R. Ernst¹, S. Schielke¹, J. Gerber², N. Benczer-Koller³, G. Kumbartzki³, P. Maier-Komor⁴, F. Nowacki⁵, and Y.Y. Sharon³ — ¹Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn, Germany — ²Institut de Recherches Subatomiques, F-67037 Strasbourg, France — ³Dept. of Physics and Astronomy, Rutgers Univ., New Brunswick, NJ 08903, USA — ⁴Physik Department, TU München, D-85748 Garching, Germany — ⁵Laboratoire de Physique Théorique, F-67084 Strasbourg, France

Precise data from recent measurements of g factors for the 2₁⁺ and 4₁⁺ states of ⁵⁰Cr and the 2₁⁺ state for ⁵²Cr were well explained by large shell model calculations [1]. In particular, the puzzle of the g factor ratio of the 4₁⁺ to the 2₁⁺ state in ⁵⁰Cr has been unravelled. These data were supplemented by a redetermination of the g factor of the ⁵⁴Cr(2₁⁺) state. Like for the other Cr isotopes, the same technique of projectile Coulomb excitation in inverse kinematics was applied. ⁵⁴Cr beams of 115 MeV were provided in its natural isotopic abundance by the ion source of the Cologne tandem accelerator. The g factor value obtained, g=0.832(56), and the B(E2) deduced from the lifetime are compared with shell model calculations within the same large configuration space as for the lighter isotopes.
[1] R. Ernst et al., Phys. Rev. Lett. 84 (2000) 416
⁺ supported by DFG and BMBF