Abstract
Results of a Cr-nat(gamma, gamma') experiment at the S-DALINAC are
reported for energies up to 7 MeV utilizing a Euroball Cluster detector.
The excitation of a J = 1 state at 5544 keV is observed which is
believed to belong to Cr-52 because of the strength of the signal and
the large natural abundance. By a variety of empirical arguments a
quadrupole-octupole-coupled two-phonon 1(-) character is suggested for
this transition. Quasiparticle random-phase-approximation (QRPA)
calculations are able to reproduce the energy and B(E1) transition
strength remarkably well. The underlying microscopic structure is
suggested to be more complex than a pure two-phonon picture.
Furthermore, the calculations indicate a pure neutron
(2p(3/2)(-1)2p(1/2)) magnetic dipole structure for an excitation
experimentally seen at 5098 keV which would provide a direct measure of
ground-state correlations in Cr-52. (C) 1998 Elsevier Science B.V.
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