Dresden 2000 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 22: Kernphysik / Spektroskopie III
HK 22.3: Vortrag
Donnerstag, 23. März 2000, 14:45–15:00, B 68
Influence of neutron core excitations on the high-spin states of 88Sr.* — •E. Stefanova1,2, R. Schwengner1, J. Reif1, H. Schnare1, F. Dönau1, M. Wilhelm3, A. Fitzler3, S. Kasemann3, and P. von Brentano3 — 1Inst. f. Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden — 2Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria — 3Inst. f. Kernphysik, Uni zu Köln, 50937 Köln
High-spin states of 88Sr have been investigated via the reaction
80Se(11B,p2n) at the beam energy of 45 MeV. Gamma-rays have
been detected with
the six-detector array OSIRIS CUBE. The level scheme of 88Sr
has been extended up to the spin J = 17 at 11.4 MeV. Using the Doppler-shift
attenuation method, mean lifetimes of 5 levels have been obtained.
Shell-model calculations in the model space π(0f5/2,1p3/2,
1p1/2,0g9/2)ν(1p1/2,0g9/2,1d5/2)
have been performed to interpret the high-spin
structure of this nucleus. As a neutron-core break up is expected at
about 4 MeV, the core excitation of one neutron from the 0g9/2
orbital to the 1d5/2 orbital is included. The structure of level
sequences at high spin including strong M1 transitions is discussed.
* Supported by SMWK under Contract No. 4-7531.50-04-844-99/16