New oblate band in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Hg</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>196</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> with quenched <i>M</i>1 strength

B. Cederwall; M.-A. Deleplanque; F. Azaiez; R. M. Diamond; P. Fallon; W. Korten; I.-Y. Lee; A. O. Macchiavelli; J. R. B. Oliveira; F. S. Stephens; W. H. Kelly; D. T. Vo; J. A. Becker; M. J. Brinkman; E. A. Henry; J. R. Hughes; A. Kuhnert; M. A. Stoyer; T. F. Wang; J. E. Draper; C. Duyar; E. Rubel; J. deBoer

doi:10.1103/PhysRevC.47.R2443

Rapid Communication

New oblate band in ${}^{196}{Hg}$ with quenched M1 strength

B. Cederwall, M.-A. Deleplanque, F. Azaiez, R. M. Diamond, P. Fallon, W. Korten, I.-Y. Lee, A. O. Macchiavelli, J. R. B. Oliveira, F. S. Stephens, W. H. Kelly, D. T. Vo, J. A. Becker, M. J. Brinkman, E. A. Henry, J. R. Hughes, A. Kuhnert, M. A. Stoyer, T. F. Wang, J. E. Draper, C. Duyar, E. Rubel, and J. deBoer

Phys. Rev. C 47, R2443(R) – Published 1 June 1993

Abstract

High-spin states in the nucleus ${}^{196}{Hg}$ were populated in the reaction ${}^{192}{Os}$ $(^{9}$ Be,5n) at a beam energy of 65 MeV. A regular rotational-like ΔI=1 band has been observed up to an excitation energy of $E^{*}$ ≊8.7 MeV and spin I≊30ħ. This is the second observation of a band of this character in a mercury isotope. The experimental results are compared with mean field calculations and semiclassical estimates based on the Dönau-Frauendorf formalism. The mercury bands show significantly lower B(M1)/B(E2) branching ratios as compared with similar bands in light lead nuclei. This difference may be more readily explained by a difference in single-particle structure rather than by large differences in deformation between the lead and mercury configurations.