High-spin structure in Pt-187

High-spin states in Pt-187 were studied via the Yb-173(O-18, 4n) reaction. Rotational bands based on the vi(13/2), v7/2(-)[503], vi(13/2)(2)vj, v3/2(-)[512] and v1/2(-)[521] configurations were observed, and interpreted within the framework of the cranked shell model. The TRS calculations show that the vi(13/2) band has an appreciable negative gamma deformation, and the negative-parity bands tend to have a near prolate shape with small positive gamma values. Experimental values of B(M1)/B(E2) ratios have been extracted and compared with theoretical values from the semi-classical Donau and Frauendof approach, strongly suggesting a low frequency pi h(9/2) alignment in the v7/2(-)[503] band.

High-spin states in Pt-190

The level structure of Pt-190 has been studied experimentally using the Yb-176 (O-18, 4n) reaction at beam energies of 88 and 95 MeV. gamma-gamma-t coincidence measurements were carried out. Based on the analysis of gamma-gamma coincidence relationships, the level scheme of Pt-190 is extended to high-spin states. A new structure built on the 3413.6 keV 14(+) state has been observed, and the vi(13/2)(-2) vh(9/2)(-1) vj (j = p(3/2) or f(5/2)) configuration is tentatively assigned to it.