Cranking model interpretation of weakly coupled bands in Hg isotopes

Rotation aligned bands and configuration dependent interaction in189Hg

“…The Hg isotopes have been extensively investigated, both experimentally [1][2][3][4][5][6][7][8][9][10] and theoretically [11][12][13]. Of particular interest is the description of their high spin structure in terms of rotation aligned quasiparticle states and bands built on these states.…”

The g-factor of the J?=12+ isomeric state in188Hg

“…Recent measurements of g-factors [9][10] [11] have led to the conclusion that the yrast-state with I > 8 are rotation aligned (vi~) -2 configurations. The cranking-shell model [12] provides a satisfactory description of this behaviour [5][6][7]. In the mass range 190_A_< 198 the level schemes are indeed of striking similarity.…”

“…The study of the yrast gamma cascades of mercury isotopes in the mass range A =184-198 has given confirmation of this behaviour [2-63. The heavier Hg isotopes (A>189) are considered having small oblate deformation (fin-0.1) with rotational bands built on the weakly deformed oblate core. Anomalies observed in the positive parity yrast sequences have been explained as band crossing phenomena due to the competition and interplay between the different modes of carrying away angular momentum [7][8]. A strong level bunching around I ~= 10+ gives rise to isomerism of the 10+ and 12+ states.…”

Dipole Bands in [sup 196]Hg

“…The structures at low to moderate spin result mainly from excitation of i 13/2 and nj (j = p 3/2 , f 7/2 , p 1/2 ) neutrons. The Cranked Shell Model had been successfully used to describe routhians, band crossing frequencies and alignments in these oblate nuclei [1,2]. In this mass region dipole bands have been observed in many Pb and Hg isotopes [3][4][5][6] and it has been suggested that these structures involve deformation aligned h 9/2 and i 13/2 protons in the Pb isotopes, while in Hg rotation aligned h 11/2 protons also play a role.…”