Observation of newh_9/2andh_11/2bands in¹⁸⁷T1

Abstract

Abstract. The unfavoured signature of the rotation-aligned band associated with the prolate h 9/2 structure in 187 Tl has been identified. The deformation-aligned 11/2 − [505] band is also confirmed and extended. While the alignment properties of the 11/2 − [505] band seem to indicate that it has a similar magnitude of deformation as the prolate 186 Hg core, the signature splitting at low spin, taken together with new self-consistent calculations, suggest that it may actually be triaxial with γ ≈ −18 0 near the bandhead.

Lifetime measurements in the yrast band of 187Hg

“…On careful looking at the available decay scheme of 187 Tl [46,47] and 186 Hg [48], it was observed that there are few close-by γ-ray transition energies in their decay schemes which could possibly contaminate our 566keV gamma energy peak of our interest. In this respect 564.4 keV (23/2 − → 21/2 − ) intra-band transition from h 9/2 band and 568.5 keV (23/2 − → 19/2 − ) intra-band transition from h 11/2 band in 187 Tl and the 566.9 keV (21 − → 19 − ) transition from band 3 in 186 Hg could be the potential candidates.…”