Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Kernphysik II / Spektroskopie I

HK 10.4: Vortrag

Montag, 22. März 1999, 17:30–17:45, B

The Structure of the 4.743 MeV State in ⁸⁸Sr ^* — •L. Käubler¹, P. v. Brentano², J. Eberth², J. Enders³, A. Fitzler², C. Fransen², 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 nuclear resonance fluorescence experiment on the N=50 nucleus ⁸⁸Sr has been performed at the S-DALINAC accelerator with an electron energy of 6.8 MeV and the linear polarization of the scattered photons has been measured. A EUROBALL CLUSTER detector has been used as Compton polarimeter for γ-rays with 1.8 MeV < E_γ < 6.5 MeV. For the 4.743 MeV state which has been considered until now [1] as the 1⁻ two-phonon state with a 2⁺ ⊗ 3⁻ structure positive parity has been found. The structure of this 1⁺ state and that of other newly observed states is discussed in the framework of QPM calculations.
[1] F. R. Metzger, Phys. Rev. C11 (1975) 2085
^*Supported by BMBF, contracts 06DA665I and 06OK862I, DFG, contracts Gr-1674/1-1, Br-799/6-2 and Ri-242/12-1, and Sächsisches SMWK, contract 7533-70-FZR/702