Erlangen 2001 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Postersitzung: Kernphysik/Spektroskopie
HK 12.9: Poster
Dienstag, 20. März 2001, 10:30–12:45, R
A scissors-like excitation on top of the quadrupole vibrational state in 88Sr — •L. Käubler1, H. Schnare1, R. Schwengner1, H. Prade1, F. Dönau1, E. Grosse1,2, K.D. Schilling1, A. Wagner1, and the Köln - Darmstadt - Sofia collaboration3 — 1Inst. f. Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden — 2TU Dresden, 01062 Dresden — 3Inst. f. Kernphysik, Uni zu Köln, 50937 Köln – Inst. f. Kernphysik, TU Darmstadt, 64289 Darmstadt – Inst. of Nuclear Research and Nuclear Energy, Sofia, BG-1784 Sofia
A (γ,γ’) experiment on 88Sr has been performed
at the S-DALINAC accelerator
of the TU Darmstadt.
In the search for the 1− two-phonon
state with the structure (21+ ⊗ 31−)
in the N=50 nucleus 88Sr
we found angular momentum and parity Jπ=1+ for the 4.742 MeV
state [1].
Four further dipole states have been observed in the energy region
4.5 MeV ≤ Ex ≤ 5.5 MeV.
The deexcitation pattern of the Jπ=1+ state at 4.742 MeV in
88Sr is similar to that of the scissors mode observed in 94Mo
[2]. Therefore the 4.742 MeV state is proposed to be
a scissors-like state in the spherical nucleus 88Sr on top of the
quadrupole vibrational state. This scissors-like excitation may arise
from a superposition of the isoscalar and isovector quadrupole
vibrations.
[1] L. Käubler et al., Eur. Phys. J. A7 (2000) 15
[2] N. Pietralla et al., Phys. Rev. Lett. 83 (1999) 1303
*Supported by the DFG, contract Gr-1674/1-1,
and the SMWK, contract 7533-70-FZR/702.