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HK: Physik der Hadronen und Kerne

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

HK 37.3: Vortrag

Mittwoch, 21. März 2001, 17:15–17:30, D

Measurements of g factors and lifetimes of the 2₁⁺ states in ⁶²⁻⁷⁰Zn and their implication for shell model calculations ⁺ — •O. Kenn¹, K.-H. Speidel¹, R. Ernst¹, S. Schielke¹, S. Wagner¹, J. Gerber², P. Maier-Komor³, N. Benczer-Koller⁴, G. Kumbartzki⁴, and F. Nowacki⁵ — ¹Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn, Germany — ²Institut de Recherches Subatomique, F-67037 Strasbourg, France — ³Physik-Dept., TU-München, D-85748 Garching, Germany — ⁴Dept. of Physics and Astronomy, Rutgers Univ., New Brunswick, NJ 08903,USA — ⁵Physique Théorique Bat.40/1 CRN, F-67037 Strasbourg, France

Magnetic moments and B(E2) values are sensitive probes for determining the nuclear structure. This has been demonstrated by several recent measurements using the new technique of projectile Coulomb excitation in inverse kinematics combined with transient magnetic fields [1]. The high quality of the experimental data even allowed to test effective NN-interactions used in shell model calculations. New precise measurements were performed for the 2₁⁺ states of ⁶⁴⁻⁷⁰Zn isotopes and, for the first time, for radioactive ⁶²Zn. Isotopically pure Zn beams with energies of 160 MeV, provided by the tandem accelerator at Munich, were Coulomb excited with a natural carbon target. The ⁶²Zn(2₁⁺) state was strongly populated in the α-transfer reaction from ¹²C to ⁵⁸Ni beams of 155 MeV. The results are compared with large scale shell model calculations.
[1] R. Ernst et al., Phys. Rev. Lett. 84 (2000) 416
⁺ supported by DFG and BMBF