Excitation of high-spin states in 190, 191, 192, 193, 194hg through (α, xn) reactions

Particle-rotor model for doubly odd transitional nuclei of the Tl-region

“…We believe the procedure to be reliable for spin values up to I --15 17 which are mainly related to core states with 1--19 1<4. The -Y, 2~ pair represents a limiting case going parallel with the appearance of the discontinuity in the gsb of 196Hg [16,17]. This is indeed reflected in the change of character of the distributions of these states (especially for I = 21/2).…”

“…We have collected in Table 2 data concerning the gsb of 194'196Hg [16,17] (which represent the relevant cores for the T1 nuclei under discussion), the recently reported ~hg/2 bands in odd mass T1 isotopes [6,7] and the available information on the negative parity bands in doubly odd 196'198T1 [8,9]. Some comments are necessary about the doubly odd data.…”

Coupling of one and two quasiparticles to a Bohr-Mottelson core in195,196,197,198Hg

“…Here Jk denotes the moment of inertia corresponding to the principal axes k and co k is the rotation frequency around the k axes. Va~ f is the deformation potential energy and B~j(i,j= [3,7 ) denote the so-called mass parameters. In Refs.…”

“…The term Vde f contains also the pairing correction with an average pairing gap of zl = 12A-1/2 MeV [34]. The moments of inertia Jk and the mass parameters Bij(i,j=fi, 7) were calculated in the framework of the cranking approach including the pairing interaction [35][36][37]. [38].…”

“…The yrast bands of the even isotopes of Hg [1][2][3][4][5][6][7] and Pt [8][9][10][11][12][13][14] reveal a sudden decrease of the energy spacing around 8 +, 10 § Indeed the energies of the states 8 +, 10 +, 12 § are distributed in an interval of about 150-200 keV while in the case of the even isotopes of Pt the state 12 + is only by about 200 keV higher than the 10 +. Moreover the structure of the band beyond 12 + is very similar to that of the lower collective part.…”