Spectroscopy of195Hg and196Hg

Dipole Bands in [sup 196]Hg

“…1) is generally in agreement with that reported by Mehta et al [2]. The dipole band observed by Cederwall et al [3] is confirmed by our results (DB2).…”

“…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.…”

“…Such differences in the configurations are revealed by lower values of the B(M1)/B(E2) ratios in the Hg isotopes. The main features of the known level scheme of 196 Hg [2] are a positive parity band up to spin 26 + and two negative parity sequences, one up to 23and the other up to 12 -. Two band crossings (AB and CD) are observed in the positive parity band and one in the negative parity band (BC), and the band crossing frequencies and alignments are well reproduced by the CSM.…”

“…The 229 and 571 keV transitions were assigned M1/E2 nature based on the angular distribution ratios which assisted in fixing the spin and parity of the band above the backbend at ~4 MeV excitation.Previously observed 243 and 265 keV dipole transitions[2] were shown to be part of a new dipole band (DB1). The spins and parities of levels of this band were firmly established by DCO and polarization measurements on the 821, 963 and 1147 keV transitions linking this dipole band to the odd spin negative parity band (ABCE).…”

Isomers and oblate rotation in Pt isotopes: Delineating the limit for collectivity at high spins

“…6). In N = 116 isotones, an oblate structure with a second nucleon alignment had been established earlier in 192 Os [4] and 196 Hg [29], and the initial part of the aligned structure had been identified in 194 Pt as well [7]. The second alignment is now fully delineated to high spin from 192 Pt to 196 Pt, with 196 Pt being the stable isotope with the most number of neutrons where rotation alignments in the oblate sequence have been seen.…”