Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 29: Nuclear Structure/Spectroscopy V
HK 29.7: Talk
Wednesday, March 10, 2004, 16:15–16:30, A
Investigations of high-spin states in 73,74,75Se — •O. Thelen1, J. Eberth1, D.G. Sarantites2, M. Devlin2, T. Steinhardt1, and A. Fitzler1 — 1Institute for nuclear physics, University of Cologne, Germany — 2Department of Chemistry, Washington University, St. Louis, MO, USA
High-spin states of the Selenium-Isotopes have been populated by the reaction 30Si(48Ca,xn)73,74,75Se at a beam energy of 165MeV. The experiment was performed at Argonne National Laboratory, USA using the GAMMASPHERE γ-spectrometer with the MICROBALL charged particle-spectrometer. Mainly high-spin band structures were extended by analysis of four dimensional coincidence-cubes. Spin asignments have been derived from DCO analysis.
The two strongly coupled negative parity bands in 73Se were extended up to 45/2ℏ and 43/2ℏ with excitation energies up to 12.6 MeV.
The positive parity ground state band in 73Se was observed up to a tentative spin of 41/2ℏ and energy of 9.9 MeV. For 74Se all previously known band structures have been extended to spin 30 and excitation energy of 23.3 MeV. A large variety of shape coexistence effects have been investigated.
6 known and 1 new band in 75Se have been investigated. Tentative spins up to 51/2ℏ for the π=+ bands and 37/2ℏ for the π=− above the band crossing have been observed.
The band structures will be interpreted in the framework of Cranked Shell Model calculations.