Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 23: Nuclear Structure/Spectroscopy IV

HK 23.2: Talk

Wednesday, March 10, 2004, 11:15–11:30, A

B(E2) and g Factor Measurements on 4₁⁺ and 3₁⁻ States of ⁶⁴Zn and ⁶⁸Zn in the Light of Large-Scale Shell Model Predictions⁺ — •J. Leske¹, K.-H. Speidel¹, O. Kenn¹, S. Schielke¹, D. Hohn¹, J. Gerber², P. Maier-Komor³, and F. Nowacki² — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — ²Institut de Recherches Subatomiques, F-67037 Strasbourg, France — ³Physik-Dept. Technische Univ. München, D-85748 Garching

Predictions of g factors and B(E2) values by large-scale shell model calculations on even-A Zn isotopes have motivated us to extend our systematic measurements for the 2₁⁺ states [1] to the higher excited 4₁⁺ and 3₁⁻ states. Besides improving the accuracy of such data for ⁶⁴Zn [2] we have measured g factors and lifetimes of those states in ⁶⁸Zn. The technique used was projectile Coulomb excitation on an isotopically pure ⁶⁸Zn beam of 180 MeV (from the Munich tandem accelerator) combined with transient fields in ferromagnetic gadolinium of a multi-layered target; natural carbon was used for Coulomb excitation. The lifetimes of the excited states have been measured simultaneously with the spin precessions using the Doppler-shift attenuation method. The g factors and B(E2)’s deduced are compared with the results of shell model calculations.

+ supported by the DFG under Sp 190/9-2

[1] O.Kenn et al., Phys. Rev. C 65 (2002) 034308

[2] J.Leske et al.,Verhandl.DPG (VI) 38, 3/69 (2003)