Nuclearg-factor measurements of the92−and

Three-quasiparticle isomer in Ta173 and the excitation energy dependence of K -forbidden transition rates

“…It is also notable that, from a g-factor measurement, Thakur et al [11] reported a half-life of 132(3) ns, in reasonable agreement with our value of 148 (9) ns. However, their use of NaI detectors, combined with their assumption of incorrect γ -ray energies from André et al, could render their analysis unreliable.…”

“…For this configuration, the Nilsson model g-factor calculation gives g K = 1.11, in satisfactory agreement with the experimental value of 1.25 (12). However, there is again disagreement with Thakur et al [11], who reported g K = 0.63(1) and hypothesised configuration mixing to explain their low value. In particular, they suggest a 61% component [19] and 175 Ta [20].…”

“…We note that Thakur et al [11] obtained g K = 0.665(43) using time-differential perturbed angular distributions for the bandhead decay γ rays, disagreeing with both the experimental and theoretical values just discussed. However, we consider that the use of NaI detectors renders their results unreliable.…”

“…Subsequent relatively high-statistics studies using the 159 Tb( 18 O,4n) and 160 Gd( 19 F,6n) reactions [8,9] did not confirm the existence of this isomer. However, support for the isomer came from measurements of its electric quadrupole moment [10] and its magnetic dipole moment [11], both using low-resolution sodium iodide detectors in conjunction with the 165 Ho( 12 C,4n) reaction, and a half-life of 132(3) ns was reported [11]. Nevertheless, significant problems remained regarding the data interpretation, and further measurements seemed to be warranted.…”