Description of high spin states

Measured gyromagnetic ratios of individual excited states in the ground- and gamma-bands of166Er

“…3; the agreement is seen to be remarkably good. This agreement is all the more striking, if not significant, when considered in light of shortcomings noted [31][32][33] in CHFB theory calculations and in view of the markedly smaller variation of measured g-factors than predicted by Ansari et al [4] for a 54Sm [34] (the only other nuclide in which a similarly extensive systematic comparison could be made for states up to J= 10~).…”

Gyromagnetic ratios of collective states of166Er

“…A strong coupling leads to a repulsion of the two bands, the mixing starts already at low spins and only a weak "upbending" of the different moments of inertia is observed. If, however, the coupling is weak, the two bands come very close and rapid mixing of the wave functions and a dramatic change of the moments of inertia ("backbending") happens in the crossing region [7,8]. Magnetic moments of the yrast states in the crossing region would provide a very sensitive test of the actual nuclear structure.…”

Systematic behavior ofB(E2) values in the yrast bands of doubly even nuclei

“…The approximate coincidence of S~p with S~o t means Q2/j is approximately constant implying a validity of the above-mentioned relation Jo2 ~Q22 [7] up to spin I~8. [14]) leads to increasing moment of inertia [5] at an almost constant quadrupole moment Qo meaning that Qz/j here decreases with increasing spin. a confirmation of the hydrodynamical model up to I~8 for deformed nuclei, might be concluded.…”

“…2-4 shows, however, that the experimental data are still insufficient for general quantitative conclusions. Of course, more precise considerations should take into account that the mixing amplitudes ci,:o (10) depend also on other characteristics of the crossing bands besides on the interaction V, which additionally might vary with deformations /~2 and/~4 for different proton numbers Z [14,15]. According to [15], for nuclei with N =98, a maximum of the interaction V (i.e., no J-backbending, no Sexy-circling or downbending) is expected.…”