München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Kernphysik/Spektroskopie

HK 10.5: Vortrag

Montag, 20. März 2006, 17:45–18:00, C

The g factor and B(E2) of the 4₁⁺ state of Coulomb excited ⁶⁶Zn compared to shell model predictions⁺ — •J. Leske¹, K.-H. Speidel¹, S. Schielke¹, J. Gerber², P. Maier-Komor³, T. Engeland⁴, and M. Hjorth-Jensen⁴ — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Univ. of Bonn, Bonn — ²Institut de Recherches Subatomiques, Strasbourg, France — ³Physik-Dept. TU München, Garching, Germany — ⁴Dept. of Phys. and Center of Math., Univ. of Oslo, Oslo, Norway

The g factor of the 4₁⁺ state in ⁶⁶Zn has been measured for the first time employing the technique of projectile Coulomb excitation in inverse kinematics combined with transient magnetic fields. The lifetime of this state was remeasured to be τ=1.1(2)ps, being twice as large as a previously determined value. For these measurements 180 MeV ⁶⁶Zn ion beams were provided by the Munich tandem accelerator. The target consisted of carbon on thin Gd and Cu layers. The de-excitation γ rays were measured in coincidence with forward scattered carbon ions being registered in a 0^∘ Si detector. Lifetimes of several excited states were determined using the Doppler-Shift-Attenuation method. The B(E2)’s and the g factors of the 2₁⁺ and 4₁⁺ states were discussed together with corresponding data of neighbouring ⁶⁴Zn and ⁶⁸Zn [1,2] in the framework of full fp shell model calculations. There are distinct discrepancies between experiment and theory which are not yet fully understood.
⁺ supported by the BMBF and DFG

[1] J. Leske et al., Phys. Rev. C71 (2005) 034303

[2] J. Leske et al., Phys. Rev. C72 (2005) 044301