High-spin negative parity states in doubly even Hg, Pt and Os nuclei

Identification of yrast high-Kintrinsic states inOs188

“…The level scheme of 188 Os has been extensively investigated in the 1970s by using the (α,2n) reaction [9][10][11]. In these studies, the ground-state band has been established up to spin 12 + , the γ band observed up to the 6 + state, and a 4 Figure 2 shows the level scheme deduced in the present work.…”

“…The spin of this newly observed band is unequivocally fixed on the basis of the measured DCO ratios of 0.60(11) for the 503-keV 10 + → 9 − and 1.21(6) for the 582-keV 14 + → 12 + transitions. [9]. In that work the 7 − state has been suggested to correspond to the isomeric state with a half-life of about 20 ns whose existence had been postulated by Yamazaki and Nishiyama [11] based on the observation of delayed interband transitions between the γ band and the gsb.…”

“…Both nuclei have been extensively studied and in both cases complex excitation schemes have been obtained. 188 Os, in contrast, so far has only been studied up to intermediate spin using the (α,2n) reaction [9][10][11] and Coulomb excitation [12] and only states up to spin 12 + have been identified. In our recent work on the heavy dysprosium isotopes 159-163 Dy [13,14] we have demonstrated that the incomplete fusion reaction induced by a 7 Li beam is a very valuable tool for populating stable neutron-rich nuclei up to high angular momentum (28 + in 162 Dy [13]).…”

“…[9,17]. Based on the measured DCO ratios for these γ rays we propose spin values of (8 − ) and 9 − for the states at 1995 and 2056 keV, respectively.…”

New levels observed in188Os from the decay of188Re

“…Several recent reaction studies [1][2][3] have produced new results on the low energy (< 2 MeV) level structure of ISSOs. These results include two 0 + levels at 1480 and 1 705 keV which were observed in a (p, t) reaction investigation [3].…”