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HK: Hadronen und Kerne
HK 28: Spectroscopy: 70 ≤ A < 110
HK 28.5: Talk
Tuesday, March 17, 1998, 15:15–15:30, D
Two- and Three-Phonon States in 88Sr — •L. Käubler1, P. v. Brentano2, J. Eberth2, J. Enders3, A. Fitzler2, M. Grinberg4, E. Grosse1, R.-D. Herzberg2, H. Kaiser3, P. v. Neumann-Cosel3, N. Pietralla2, H. Prade1, A. Richter3, H. Schnare1, R. Schwengner1, Ch. Stoyanov4, H.-G. Thomas2, H. Tiesler2, D. Weißhaar2, I. Wiedenhöver2, and A. Zilges3 — 1Institut für Kern- und Hadronenphysik, FZ Rossendorf, D-01314 Dresden — 2Institut für Kernphysik, Universität zu Köln, D-50937 Köln — 3Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt — 4Institute of Nuclear Research and Nuclear Energy, Sofia, BG-1784 Sofia
A (γ,γ’) experiment on 88Sr with an endpoint energy of
the bremsstrahlung of 6.8 MeV has been performed at the S-DALINAC
accelerator using two EUROBALL CLUSTER detectors at 90o and 127o.
Several γ-rays have been observed for the first time in the
(γ,γ’) reaction. Coincidences between the single detector
elements of the 90o CLUSTER detector are used to determine γ-ray
linear polarizations. From the 4.743 MeV state and from the Jπ=1−
states at 6.215 and 6.335 MeV γ-ray branches to the 21+ level
have been observed. In accordance with QPM calculations, an interpretation
as 2+ ⊗ 3− and 2+ ⊗ 2+ ⊗ 3−
structures, respectively, is proposed.
Supported by Sächsisches SMWK, contract AZ 7533-70-FZR/702,
BMBF, contracts 06DA665I and 06OK862I and DFG, contracts Br-799/6-2 and
Ri-242/12-1