Dresden 2000 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 16: Postersitzung / Kernphysik
HK 16.9: Poster
Thursday, March 23, 2000, 10:15–12:45, B 69
A nuclear resonance fluorescence experiment on the N=50 nucleus 87Rb * — •L. Käubler1, K.D. Schilling1, D. Belic2, P. v. Brentano3, F. Dönau1, C. Fransen3, E. Grosse1, U. Kneissl2, C. Kohstall2, A. Linnemann3, P. Matschinsky3, A. Nord2, N. Pietralla3, H.H. Pitz2, M. Scheck2, R. Schwengner1, F. Stedile2, and V. Werner3 — 1Inst. f. Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden — 2Inst. f. Strahlenphysik, Uni Stuttgart, 70569 Stuttgart — 3Inst. f. Kernphysik, Uni zu Köln, 50937 Köln
The first (γ,γ′) experiment on
87Rb was performed at the Stuttgart Dynamitron accelerator
with bremsstrahlung of an endpoint energy
of 4.0 MeV.
Gamma-rays scattered on a 2.507 g 87Rb2CO3 target
were measured with three HPGe detectors of 100 % relative efficiency.
Reduced widths of 18 known states could be obtained for the first time
and the γ-deexcitation of 8 levels established previously only in
particle reactions was observed. Two new states were identified.
The experimental findings are compared with excitations
in the N=50 nucleus 89Y [1] and are discussed
on the basis of the coupling of a proton
in the p3/2, f5/2, p1/2 and g9/2 shell-model orbits to
the lowest lying core states in the N=50 nucleus 88Sr [2].
Also shell-model calculations for 87Rb are discussed.
[1] J. Reif et al., Nucl. Phys. A 620 (1997) 1
[2] L. Käubler et al., submitted to Eur. Phys. J. A
*Supported by the DFG, contracts Br-799/9, Gr-1674/1-1
and Kn-154/30, and the SMWK, contract 7533-70-FZR/702.