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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Kernphysik / Spektroskopie
HK 52.1: Talk
Thursday, March 15, 2007, 17:00–17:15, B
Lifetime measurements in 168,170Hf — •Alin Costin1,2,3, Tan Ahn1,2,3, Blagovest Bochev2, Kevin Dusling2, Tak Chu Li2, Norbert Pietralla1,2,3, Georgi Rainovski2,4, Wolfram Rother3, and Yale Plunger Group5 — 1IKP, TU Darmstadt — 2NSL, SUNY, Stony Brook, USA — 3IKP, Universität zu Köln — 4University of Sofia, Sofia, Bulgaria — 5WNSL, Yale University, New Haven, USA
Lifetime measurements were performed on ground state band levels of 168,170Hf for testing relevant nuclear structure models. Geometrical models with a soft potential in the quadrupole deformation parameter β, such as the confined β-soft (CBS) rotor model [1], predict centrifugal stretching along a rotational band as a function of spin. This causes an increase of a few percent per ℏ in transitional quadrupole moments Qt in strongly deformed nuclei (R4/2 3.0). The change in Qt values of more rigidly deformed nuclei is predicted to be considerably smaller. Previous lifetime measurements [2] on 168,170Hf are not accurate enough for testing these predictions. The new measurements are sufficiently precise and clearly show centrifugal stretching.
[1] N. Pietralla and O. M. Gorbachenko, Phys. Rev. C 70, 011304(R) (2004).
[2] B. Bochev et al., Nucl. Phys. A 282, 159 (1977).