182Pt as a possible candidate for X(5) symmetry
2012
Recently, a new island of X(5) nuclei has been suggested around A=180 exemplified by some
Osmiumisotopes. To investigate the limits of its region, a
Recoil-distance Doppler shift lifetime measurement has been performed for 182Pt. For the data analysis, the Differential decay curve method has been applied in a newly developed version convenient for low
recoilvelocities and a non-negligible fraction of nuclei stopped already in the target. The level energies and the newly deduced transition quadrupole moments in the
yrastband reveal the persistence of X(5) features in the investigated nucleus, but other spectroscopic data and IBM and GCM calculations indicate shape coexistence and a position of 182Pt close but not at the critical point of the shape-transition.
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