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HK: Hadronen und Kerne
HK 38: Spectroscopy 104 ≤ A < 140
HK 38.2: Talk
Tuesday, March 17, 1998, 17:15–17:30, D
Dipole excitations in the vibrational nucleus 112Cd — •A. Nord1, H. Lehmann2, A.E. de Almeida Pinto1, O. Beck1, J. Besserer1, D. Belic1, P. von Brentano3, J. Drissi2, T. Eckert1, R.-D. Herzberg3, D. Jäger1, J. Jolie2, U. Kneissl1, J. Margraf1, H. Maser1, N. Pietralla3, H.H. Pitz1, and S.W. Yates4 — 1Institut für Strahlenphysik, Universität Stuttgart, D-70569 Stuttgart — 2Institute de Physique, Université de Fribourg, CH-1700 Fribourg — 3Institut für Kernphysik, Universität zu Köln, D-50937 Köln — 4Dep. of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055
The strength distribution of low-lying dipole excitations
in the medium-weight vibrational nucleus 112Cd was studied
in nuclear resonance fluorescence experiments (NRF) performed at the
bremsstrahlung beam of the Stuttgart Dynamitron accelerator
(endpoint energy 4.1 MeV).
Spectroscopic information on about 20 new spin
1 states in 112Cd have been obtained.
The observed Jπ=1− states are described in the framework of the
IBM model. The first 1− state has a B(E1) value to the
ground-state as demanded for the 1− member of the quadrupole-octupole
coupled (QOC) quintuplet.
Finally, the results are compared with those from our previous
NRF experiments [1]
on the neighboring Cd isotopes 113,114Cd and with first data from our
very recent NRF studies on 110,111,116Cd.
Supported by the DFG Nos. Kn-154/30, Br-799/6-2,
[1] W. Geiger et al., Nucl. Phys. A580, (1994), 263.