# 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*(*E*2)** of the ****4**_{1}^{+}** state of Coulomb excited **^{66}**Zn compared to shell model predictions**^{+} — •J. Leske^{1}, K.-H. Speidel^{1}, S. Schielke^{1}, J. Gerber^{2}, P. Maier-Komor^{3}, T. Engeland^{4}, and M. Hjorth-Jensen^{4} — ^{1}Helmholtz-Institut für Strahlen- und Kernphysik, Univ. of Bonn, Bonn — ^{2}Institut de Recherches Subatomiques, Strasbourg, France — ^{3}Physik-Dept. TU München, Garching, Germany — ^{4}Dept. of Phys. and Center of Math., Univ. of Oslo, Oslo, Norway

The *g* factor of the 4_{1}^{+} state in ^{66}Zn 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 ^{66}Zn 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*(*E*2)’s and the *g* factors of the 2_{1}^{+} and 4_{1}^{+} states were discussed together with corresponding data of neighbouring ^{64}Zn and ^{68}Zn [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