Transient magnetic field measurements for even Ge isotopes

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

“…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.…”

“…1980) TF parametrisation. Table 1 presents the results of the present study, some related experimental particulars, and a comparison of the present inferred absolute g-factors with those of the Oxford group (Pakou et al 1984). These results are compared in Fig.…”

“…The present findings were obtained in a single simultaneous measurement of the relative g-factors of these states using one target, while Pakou et al (1984) employed six different targets, each consisting of pairs of isotopes,. mounted on six Fe foils of different thicknesses.…”

“…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.…”

“…Both the initially reported measurements (Heestand et al 1969) and their subsequent reanalysis (Hubler et al 1974) displayed systematic mass dependencies of the g-factors of these levels which disagreed markedly with that expected for these ostensibly collective states. More recently, however, the measurement of g(2t; 70Ge) by the Uppsala group (Fahlander et al 1977) and their reanalysis of the earlier data set for 72-76 Ge (Heestand et al 1969), as well as an experimental study of the gyromagnetic ratios of the 2t level in all four Ge isotopes by the Oxford group (Pakou et al 1984), found the trend exhibited to be more in keeping with the hydrodynamical 9 = Z/A expectation. While the findings of the former works might tend to suggest that 'anomalous' nuclear structure features could be attributed to the 2t states of these Ge isotopes, the latter investigators indicated that such an interpretation did not appear warranted on the basis of their findings.…”