Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 29: Nuclear Structure/Spectroscopy V
HK 29.1: Gruppenbericht
Mittwoch, 10. März 2004, 14:00–14:30, A
Test of the critical point symmetry X(5) in the A=150,180 mass regions — •A. Dewald1, O. Möller1, A. Fitzler1, B. Saha1, D. Tonev1, K. Jessen1, J. Jolie1, K.O. Zell1, P. von Brentano1, P Petkov2, N. Marginean3, M. Axiotis3, D. Bazzacco4, S Lunardi4, C.A. Ur4, R. Menegazzo4, and E. Farnea4 — 1IKP Universität zu Köln, Germany — 2Bulg.Acad. of Science, INRNE, Sofia, Bulgaria — 3INFN, LN Legnaro, Italy — 4University and INFN Padova,Padova, Italy
We will report on investigations aiming for stringent tests of the new
critical point symmetry X(5) predictions [1] for the N=90 nuclei
154Gd and 156Dy. Aside from the energy spectra, absolute
transition probabilities are crucial observables. We will compare our
latest experimental values with the X(5) calculations as well as with
IBM and GCM fits. Based on the energy spectra and relative
transition probabilities, the 176−180Os nuclei can be considered
to be very promising X(5) candidates in a new mass region. In oder to
perform stringent tests for these Os nuclei more experimental data on
absolute transition probabilities are needed. Therefore we performed a
coincidence plunger measurement with the GASP spectrometer and the
Köln plunger device. First results will be presented and
compared to X(5) and IBA calculations.
[1] F. Iachello, Phys. Rev. Lett.. 87, 52502 (2001)
Supported by the
BMBF project no. 06K-167 and under the Eu Programme contract no.
HPRI–CT-1999-00083