Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 7: Nuclear Moments
HK 7.6: Talk
Monday, March 16, 1998, 15:30–15:45, E
Test of shell model calculations for 50Cr with measured magnetic moments of the first excited 2+ -and 4+ -states+ — •R. Ernst1, K.-H. Speidel1, A. Gohla1, U. Grabowy1, B. Heller1, J. Gerber2, P. Maier-Komor3, G. Jakob4, G. Kumbartzki4, N. Benczer-Koller4, and L. Zamick4 — 1Institut f"ur Strahlen- und Kernphysik, Univ. Bonn, Nußallee 14-16, D-53115 Bonn — 2Institut de Recherches Subatomique, F-67037 Strasbourg, France — 3Phys. Dept. TU M"unchen, D-85748 Garching — 4Dept. of Phys., Rutgers Univ., USA
Large-scale shell model calculations predict for the yrast states of 50Cr [1], with excitation of neutrons and protons in the fp-shell, g-factors such as g(2+)=0.54, g(4+)=0.76, g(6+)=0.74 etc. which are in severe conflict with experimental data [2] yielding the same value for all states. The discrepancy has been attributed to more collectivity than described by the model. We have performed new measurements focussing on the 2+– and 4+-states for which theory predicts a striking increase of the g-factor. Coulomb excitation of 120 MeV 50Cr beam ions from the Munich tandem accelerator was accomplished with a carbon target. For the measurement of the magnetic moments the transient field technique with Gd as host was applied. The results are compared with those of former measurements and model predictions
[1] L. Zamick, D.C. Zheng, Phys. Rev. C54, 956 (1996)
[2] A. Pakou et al., Phys. Rev. C50, 2608 (1994) + supported by BMBF and DFG