Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Struktur und Dynamik von Kernen IX
HK 57.5: Talk
Thursday, March 24, 2011, 17:30–17:45, O-1
New measurements of the g-factor and lifetime of the 21+ state in 86Sr using a Sr beam* — •K.-H. Speidel1, G.J. Kumbartzki2, N. Benczer-Koller2, D.A. Torres2, Y.Y Sharon2, T. Ahn3, V. Anagnostatou3, Ch. Bernards3, M. Elvers3, P. Goddard3, G. Ilie3, D. Radeck3, D. Savran3, V. Werner3, J. Ashenfelder3, F. Lopez3, C. Miller3, and P. Maier-Komor4 — 1Helmholtz-Institut für Strahlen- und Kernphysik, Uni Bonn — 2Rutgers University, New Brunswick NJ — 3Yale University, New Haven CT — 4Physik-Department, TU München
In view of the wide nuclear structure interest in nuclei near the N=50 shell closure we have remeasured the g-factor and the lifetime of the 21+ state in 86Sr employing projectile Coulomb excitation combined with the transient field technique. As 86Sr is the isotone of 88Zr but with two protons less one may expect very similar wave functions for the corresponding 21+ states. This suggestion is well supported by an almost identical excitation pattern of low-lying states. The 86Sr beam of 250 MeV was provided by the Yale tandem accelerator and Coulomb excited by a carbon layer deposited on thin layers of Gd and Cu. The γ rays emitted from 86Sr have been measured with Ge Clover detectors in coincidence with the recoiling carbon ions which were detected in a Si detector at 0∘. The g-factor and the lifetime of the 21+ state were determined from spin precessions in the transient field and the Doppler-broadened lineshape of the (21+→01+) γ line, respectively. The results are compared with previous data and will be discussed in the context of new results for 88Zr. *supported by the DFG