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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Kernphysik / Spektroskopie
HK 18.3: Talk
Tuesday, March 13, 2007, 17:30–17:45, D
New spin assignments in the N=Z nucleus 42Sc from angular correlation measurements — •Clemens Scholl1, Pavel Petkov1,2, Volker Werner1,3, Andreas Linnemann1, Christoph Fransen1, Tatsuya Adachi4, Peter von Brentano1, Alfred Dewald1, Andreas Fitzler1, Yoshitaka Fujita4, Dennis Mücher1, Jan Jolie1, Alexander Lisetskiy5,7, Karlheinz Langanke5, Gabriel Martinez Pinedo5, Nico Orce6, Norbert Pietralla1, Nigel Warr1, and Karl-Oskar Zell1 — 1IKP Universität Köln, Germany — 2Bulgarian Academy of Sciences, Sofia, Bulgaria — 3WNSL, Yale University, New Haven CT, USA — 4Physics Department, Osaka University, Japan — 5GSI GmbH, Darmstadt, Germany — 6Physics Department, University of Kentucky, Lexington KY, USA — 7Physics Department, University of Arizona, Tucson AZ, USA
Using the 40Ca(3He,p) reaction at E3He = 9 MeV and the multidetector array HORUS, angular correlations of coincident γ transitions in 42Sc were measured at the FN tandem Van de Graaf accelerator at Cologne University. Nine new spins could be assigned and a series of new multipole mixing ratios determined. In particular, spin and parity of the 5+ and 7+ levels belonging to the lowest T=0 f7/22 multiplet have been determined. Thus all T=1 states up to an excitation energy of 3.2 MeV now have known spins as well as the lowest T=0 quadruplet and many other T=0 states of unknown structure. The comparison with shell model calculations reveals that a breaking of the 40Ca core has to be invoked in order to describe the level structure of 42Sc.