2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 6, 257-268

Klaus-Peter Lieb

Coincidence Doppler shift lifetime measurements in 73,74Se and 74Br using the EUROBALL Cluster cube array

R. Loritz1 - O. Iordanov1 - E. Galindo1 - A. Jungclaus1 - D. Kast1 - K. P. Lieb1 - C. Teich1 - F. Cristancho1,2 - Ch. Ender3 - T. Härtlein3 - F. Köck3 - D. Schwalm3

1 II. Physikalisches Institut, Universität Göttingen, Bunsenstrasse 7-9, 37073 Göttingen, Germany
2 Universidad Nacional de Colombia, Bogotá D. C., Colombia
3 Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany

Received: 2 July 1999 Communicated by B. Povh

Abstract
Subpicosecond lifetimes of high spin states in the rotational nuclei 73Se, 74Se and 74Br have been measured using the 58Ni + 19F compound reaction and the Doppler Shift Attenuation method. Six EUROBALL Cluster detectors arranged in cube geometry allowed us to select the relevant transitions in $\gamma\gamma$ coincidence mode. The high counting statistics achieved in this setup also facilitated the determination of average sidefeeding times, which were found to agree rather well with the results of Monte-Carlo calculations of the particle and $\gamma$-ray evaporation process. The deduced quadrupole strengths and deformations are compared with the results of previous measurements and the predictions of Cranked Shell Model calculations. In 74Br, a large and constant prolate deformation of $\beta_2$=0.37(1) was found for the presumed 4+ and 3-two-quasiparticle bands.

PACS
23.20.Js Multipole matrix elements - 23.20.Lv Gamma transitions and level energies - 24.60.Dr Statistical compound-nucleus reactions - 27.50.+e $59 \le A \le 89$


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