München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Kernphysik/Spektroskopie

HK 10.4: Vortrag

Montag, 20. März 2006, 17:30–17:45, C

Lifetime and g factor measurements of radioactive ⁵²Ti nuclei following α-transfer to ⁴⁸Ca beams in inverse kinematics⁺ — •K.-H. Speidel¹, S. Schielke¹, J. Leske¹, S.C. Bedi², O. Zell³, P. Maier-Komor⁴, S.J.Q. Robinson⁵, Y.Y. Sharon⁶, and L. Zamick⁶ — ¹Helmholtz-Institut für Strahlen- und Kernphysik, Univ. of Bonn, Bonn, Germany — ²Dept. of Physics, Panjab Univ., Chandigarh, India — ³Inst. für Kernphysik, Univ. zu Köln, Köln, Germany — ⁴Physik-Dept. TU München, Garching, Germany — ⁵Univ. of Southern Indiana, Evansville, IN, USA — ⁶Rutgers Univ., New Brunswick, NJ, USA

The g factors and lifetimes of the 2₁⁺ and 4₁⁺ states in ⁵²Ti have been measured for the first time using the technique of transient magnetic fields and the Doppler-Shift-Attenuation method. The excited states were populated in the α-transfer reaction to a ⁴⁸Ca beam of 100 MeV, provided by the Cologne tandem accelerator, in collisions with carbon of a multilayered target including Gd und Cu layers. The de-excitation γ rays were measured in coincidence with forward emitted α particles (from the decay of ⁸Be) being registered in a 0^∘ Si detector. For the spin precession and angular correlation measurements NaI(Tl) scintillators were used, whereas for the lifetime determinations a Ge detector was placed at 0^∘ for detecting the Doppler-broadened lineshapes. The g factor and B(E2) values which have been interpreted in the framework of fp shell model calculations provide sensitive tests of effective NN interactions. The results are discussed in the context of neighbouring Ti isotopes and Cr isotones and the N=28 neutron shell closure.
⁺ supported by the BMBF and DFG