Test of the critical point symmetry X(5) in the mass A = 180 region

Dewald, A.; Moller, O.; Saha, B.; Jessen, K.; Fitzler, A.; Melon, B.; Pissulla, T.; Heinze, S.; Jolie, J.; Zell, K.O.

doi:10.1088/0954-3899/31/10/008

Test of the critical point symmetry X(5) in the mass A = 180 region

2005

Published in:

J.Phys.G 31 (2005) S1427-S1432

Contribution to:

NUSTAR 05: Nuclear Structure, Astrophysics and Reactions

DOI:

10.1088/0954-3899/31/10/008

View in:

Nuclear Science References

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Abstract: (IOP)

Based on the energy spectra and relative transition probabilities176,178,180Os turned out to be very promising candidates for testing the features of the critical point symmetryX(5). In order to also test absolute transition probabilities predicted in the framework of theX(5) symmetry lifetime measurements were performed at the Cologne FN tandem accelerator. The lifetimes of the first 2+states in176,178,180Os were measured using electronic timing and in the case of178Os with the recoil distance Doppler shift (RDDS) technique using an16O-induced fusion evaporation reaction. In addition, a coincidence RDDS measurement was performed at the Laboratori Nazionali di Legnaro with the GASP spectrometer using the154Sm(29Si,5n)178Os reaction. The deduced transition quadrupole moments agree well with theX(5) predictions, thus further supporting anX(5) structure for178Os. The experimental data for178Os are compared to calculations in the framework of the interaction boson model (IBM) and of the general collective model (GCM).

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