Evolution of the X(5) critical-point symmetry in rotating {\mathbf {^{176}Os}}
Abstract
Lifetimes of excited states above 10+ in the yrast band in 176Os have been measured using the Doppler shift attenuation method, via the fusion evaporation reaction {^{152}Sm(^{28}Si, 4{{\it n}})^{176}Os}. Lifetimes of states over 12+ were measured for the first time. The deduced transitional quadruple moments (Qt), together with the previous data using a recoil distance method, are compared with theoretical calculations based on the X(5) model and the interaction boson model. For the states below spin 10+, the data of previous work support an X(5)-like structure, but for the states above 10+, the value of Qt remains almost constant, being the characteristic of a symmetric rotor. The present result suggests that the shape of the nucleus 176Os changes from X(5) critical-point symmetry to an axially deformed rotor with increasing spin.
- Publication:
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Journal of Physics G Nuclear Physics
- Pub Date:
- February 2011
- DOI:
- 10.1088/0954-3899/38/2/025102
- Bibcode:
- 2011JPhG...38b5102H