Calibration of the transient magnetic field for rare-earth nuclei in iron: Application to g-factors of high spin states in 152, 154Sm

Systematics of Gyromagnetic Ratios of the 21+ States in Even Ge Isotopes

“…It is clear in the present study, however, that as we employed the arithmetic mean of the integrated TF strengths obtained on the basis of the Rutgers (Shu etal. 1980) and Chalk River (Andrews et al 1982) field parametrisations (the former is -5% smaller than the latter) to infer the absolute g-factors, exclusive use of one or the other of these parametrisation forms would have only served to raise or lower all the values of our quoted gyromagnetic ratios by -2·5%; far too small to account for our inferred g-factors being -20% lower than both the Z/A expectation and the Oxford results. Inspection of the tabulated gyromagnetic ratios measured for the 2t states of nuclides in this mass region (Lederer and Shirley 1978) also displays a 'quenching' of these g-factors relative to 9 = Z/A, in keeping with the present findings.…”

“…Corrections for decays-in-transit were also small (<.7%), even for the shortest lived state of interest (r = I· 88 ps for the 2i level in 70Ge). The smallness of these corrections preserved the virtual independence and insensitivity of our corrected precessions to the specifics of the parametrisations employed (Shu et al 1980;Andrews et al 1982) for the velocity dependence of the TF strength for Ge ions traversing the Fe foil and to the lifetimes of these 2i states. Our experience (Stuchbery et.al.…”

“…However, as the present work was undertaken, at least in part, to more systematically and reliably determine these gyromagnetic ratios, adoption of anyone of these previously inferred g-factors to affect a 'definitive' TF strength calibration would tend to restrictively bias the present, otherwise independent, findings. Instead, the absolute gyromagnetic ratios were inferred from these relative 2: state precessions using the average of the time-integrated TF strengths obtained from the velocity-dependent TF parametrisations of the Rutgers (Shu et al 1980) and Chalk River (Andrews et al 1982) groups. Although the latter parametrisation was based upon empirical data for the rare-earth nuclides (150 ..;; A ..;; 174), and the former primarily for the A ..;; 150 isotopes, these two parametrisations yield quite similar projected TF strengths in both mass ranges.…”

g-Factor of the first 2+ state in theN=82 nucleus138Ba

“…collaboration i.e. BTF = 19.Z.v/v o exp(--0.12 V/Vo) for iron as ferromagnetic medium [8]. This BTV calibration, which reproduces the Sm and Tm precession data, has been further checked for Sm using the first 2 + state in 15OSm (g = 0.374 (28)) as probe, in similar experimental conditions as for 13SBa.…”

Disparity in transient field characteristics for Au ions traversing Fe and Gd hosts through measurements ofg-factors in197Au

“…For example, in a recent publication, Bazzacco et al [15] reported their measurements of transient field (TF) precessions for W, Pt, and Au ions separately traversing polarized Gd foils. By utilizing the g-factors of the 2+ states in 184'186W and 194'196pt determined by prior investigators [2,3,16], these authors inferred the TF strengths for both W and Pt ions in Gd to be in accord with the Chalk River parameterization [17][18][19] (which also describes well the TF behaviour of ions of lower [183 and higher [-193 atomic number traversing polarized Gd). As a consequence of their study, Bazzacco et al [15] confirmed that the TF strength for Pt in Fe is anomalously low compared with that for ions of lower atomic number in that ferromagnetic host [1,[4][5][6] and, in agreement with the findings reported in our earlier work [6], further concluded that their results clearly contradicted the suggestion [7] of the Rutgers group that the g-factors of the 2[ states of the even Pt isotopes had particularly low values of ~ 0.2.…”