Intrinsic and rotational states in 173Ta

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

“…It is notable that André et al [7] reported an isomer depopulated by 356, 609, and 840 keV transitions, each 5 keV higher in energy than those presently observed. The spectra shown by André et al do not allow this difference to be understood, but it is clearly beyond the expected energy uncertainties.…”

“…Most of the delayed γ rays are seen to be the same as those known [7] to belong to the 9/2 − [514] rotational band of 173 Ta. In accordance with the work of Carlsson et al [9], the band head is placed at 173 keV.…”

“…Therefore, this could be a good case for understanding the erosion and eventual loss of the integrity of the K quantum number. In 173 Ta, a three-quasiparticle, K π = (21/2 − ) isomer has previously been reported, from highresolution germanium-detector γ -ray measurements following the 165 Ho( 12 C,4n) and 175 Lu(α,6n) fusion-evaporation reactions, but only an approximate half-life of T 1/2 ≈ 100 ns was determined [7]. 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.…”

Absolute Gamma Ray Abundances of Rhenium and Tungsten Isotopes: Part III,A = 173

“…(2) The half-lives of all four 7-rays were consistent with each other at around 8 minutes; (3) In + Ho experiments, the 7-rays appeared with a growth corresponding to a half-life of 2 minutes ('"Re) rather than 55 seconds('"Re); (4) The 172.2 keV '''^Ta 7-ray was observed to grow with a period corresponding to a half-life of aroung 6 ± 3 minutes, closer to the 7.97 ± 0.27 minutes measured here than the literature value of 16.5 ± 0.5 minutes for'"W. (^The 7-rays at 130.2 and 174.9 keV appear in the level scheme of'"Ta [5].…”

Stimulated emission from a quasienergy multiplet structure of sodium levels in a resonant optical field

“…Inspection of published papers reveals frequent mis-assignments. For example, in the table given by Andre et al [8], summarizing .. The importance of the NPNn parametrization was first demonstrated by Casten [9] in connection with the role of the proton-neutron interaction in the growth of deformation away from shell closures, and there have subsequently been many developments of this theme.…”