Observation of new h9/2 and h11/2 bands in 187T1

The unfavoured signature of the rotation-aligned band associated with the prolate h 9/2 structure in 187 T1 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.

[1]  J. Wood,et al.  Shape coexistence in atomic nuclei , 2011 .

[2]  R. Kumar,et al.  Shape coexistence and lifetime measurement in {sup 187}Tl nucleus , 2005 .

[3]  G. Angelis,et al.  High-spin level scheme of Au183 , 2005 .

[4]  R. Clark,et al.  Spectroscopy ofPb10682188: Evidence for shape coexistence , 2004 .

[5]  S. Juutinen,et al.  Microsecond isomers in 187Tl and 188Pb , 2000 .

[6]  J. M. Lewis,et al.  High-spin structure in {sup 181,183}Au , 1998 .

[7]  P. Walker,et al.  Multi-quasiparticle potential-energy surfaces , 1998 .

[8]  Gao,et al.  New high-spin band structures in 184Hg. , 1995, Physical review. C, Nuclear physics.

[9]  W. Nazarewicz,et al.  Shape coexistence in 185Tl and 187Tl — investigation of the deformed minima , 1995 .

[10]  Dracoulis.  Properties of intruder bands in the Os-Pt-Hg-Pb region. , 1994, Physical review. C, Nuclear physics.

[11]  Gao,et al.  First evidence for states in Hg nuclei with deformations between normal and super deformation. , 1993, Physical review. C, Nuclear physics.

[12]  Richard B. Firestone,et al.  Table of Radioactive Isotopes , 1986 .

[13]  J. C. Waddington,et al.  Shape coexistence and alignment processes in the light Pt and Au region , 1986 .

[14]  S. Frauendorf,et al.  Triaxial shapes of rotating nuclei with neutron numbers 88, 89, 90 , 1983 .

[15]  A. Knipper,et al.  The levels of 185Ir populated in the decay of 185m + gPt , 1979 .

[16]  J. Jastrzȩbski,et al.  Levels of 191Ir excited in the (p, 2n) and (d, 3n) reactions☆ , 1979 .

[17]  I. Ragnarsson,et al.  Nuclear shell structure at very high angular momentum , 1976 .

[18]  L. Funke,et al.  High-spin states in 187, 189Ir:: Coexistence of strong-coupling, rotation-alignment and weak-coupling , 1975 .

[19]  F. Stephens,et al.  Coriolis effects and rotation alignment in nuclei , 1975 .