e-Article
Fast-timing lifetime measurements of the 33/2 + and 25/2 â' states in 189 Hg: oblate excitations.
Document Type
Article
Author
Source
Subject
*QUADRUPOLE moments
*MERCURY isotopes
*MERCURY
*MEASUREMENT
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Language
ISSN
0954-3899
Abstract
The lifetimes of the I Ď€ = 33/2+ and I Ď€ = 25/2â' states with E x = 2674.6 keV and E x = 1917.3 keV, respectively, in 189Hg have been determined by using the fast-timing techniques with the HPGe and LaBr3:Ce array via the 175Lu(19F, 5 n)189Hg reaction at a beam energy of 100 MeV. The deduced B (E 2) strengths have been discussed in relation to the systematics of the previously reported B (E 2) strengths in the heavy mercury isotopes. The transition quadrupole moments Q t are derived from present experimental data. The Q t values together with the excitation energies of the (+, 0)(+, 1/2) and (+, 0)(â', 1/2) bands are interpreted in terms of the Nilssonâ€"Strutinskyâ€"Bogoliubov model (CNSB) calculations suggesting oblate excitations in 189Hg. [ABSTRACT FROM AUTHOR]