Collectivity of160,161Yb at high spin

Recent Nuclear Structure Studies in Rapidly Rotating Nuclei

“…The decrease in collectivity above the band crossing has been attributed (115,117) to a loss of axial symmetry resulting from the alignment of two low-Q i 1 3/ 2 quasineutrons. This effect is, as expected, observed (see Figure 18) to be more pronounced in the gamma-soft transitional nuclei than for the more stably deformed midshell isotopes, e.g.…”

Spectroscopy of a tetrahedral doubly magic candidate nucleus ${}_{70}^{160}{\mathrm{Yb}}_{90}$

“…[7]. The first measurements of lifetimes of certain levels in the negative-parity Band-3 and Band-4 have been performed by Fewell et al, [11,12], using RDM technique. The authors of the latter work found out that the transition quadrupole-moments of these bands are similar to that of the yrast band.…”

Recent Nuclear Structure Studies in Rapidly Rotating Nuclei

“…Lifetimes for transitional dysprosium (115,116) and ytterbium (117) isotopes (N = 88-90) have two striking features that distinguish them from stably deformed rotors : (a) A loss of collectivity is observed (115-1 17) above the lowest band crossing (Figure 18); and (b) two decay times, interpreted as a fast ( < 1 ps) and a slow (�1O ps) component in the feeding of these states, are observed (116) for 154Dygg.…”

“…The decrease in collectivity above the band crossing has been attributed (115,117) to a loss of axial symmetry resulting from the alignment of two low-Q i 1 3/ 2 quasineutrons. This effect is, as expected, observed (see Figure 18) to be more pronounced in the gamma-soft transitional nuclei than for…”