Magnetic moment measurements on Hg nuclei

The magnetic moments and halflives of the 5/2? states in199Hg and197Hg and the discrepancies in the experimental hyperfine fields at Hg in Fe

“…This is consistent with a normal temperature dependence of the hyperfine field of Hg in Fe since the hyperfine field in Fe changes by approximately the same amount in this temperature range [22]. It therefore seems improbable that an anomalous temperature dependence of the magnetic hyperfine field for Hg in Fe can be the cause for the [19] f [23] discrepancy between the TDPAC [6,7] and NMR/ON [8] experiments. The measured halflife of the 134keV state, T~/2=8.1 +_0.16 ns-the quoted uncertainty includes possible systematic errors-is larger than most previously reported values [11,[14][15][16].…”

“…We have applied a 3 ~ correction for the temperature dependence of the hyperfine fields in Fe [22]. The g-factors of the first excited 2 + states of the even Hg isotopes were measured [19] by recoil into gas and vacuum experiments relative to the g-factor of the 158 keV state of 199Hg. These values are now to be revised (see Table 1).…”

Nuclear deorientation for heavy ions recoiling in vacuum and low pressure gas

“…On a nuclear basis perturbed angular distribution measurements, profiting from ionic hyperfine fields of the order of 5kT, provide a powerful means for the determination of g-factors of short-lived nuclear states [1][2][3][4][5][6]. On an atomic basis the relaxation of the nuclear spin reflects the time behaviour of the ionic hyperfine fields.…”

g-factors of the lowest 2+ and 4+ states in198, 200, 202Hg

“…The 9(4 ~) is generally consistent with the corresponding 9 (2 ~) and possibly an even lower 9(4+) value in 2~176 has been determined (see Table 2). In Table 3 the g-factors obtained from measurements performed at LNL (including the results previously published [8] for the 2] ~ states) are presented together with the earlier data on 9-factors in the stable even-mass Hg isotopes from IM-PAC [12], RIG [11] and TF [10] measurements. In Table 3 the g-factors obtained from measurements performed at LNL (including the results previously published [8] for the 2] ~ states) are presented together with the earlier data on 9-factors in the stable even-mass Hg isotopes from IM-PAC [12], RIG [11] and TF [10] measurements.…”

“…Such shape transition was theoretically predicted by the pairing plus quadrupole model (PPQM) [2,31, however the calculated o-factors are not in agreement with experimental values. The disagreement between standard IBM-2 predictions and the experimental g(2~) data in stable Pt nuclei has been recently confirmed by precise TF measurements [6, 7J. Concerning 198'2~176176 nuclei a good precision of the g(2~-) has been recently obtained in TF experiments performed at Laboratory Nazionali di Legnaro (LNL) [8], where the data were calibrated by using as internal probe the precisely known o-factor of the 5/ viously performed-o-factor measurements for the 2 + states in Hg nuclei using the recoil-into-gas (RIG) [11] and ion implantation (IMPAC) [12] were affected by quite large errors. While the trends in W and Os isotopes were reproduced, this was not the case for Pt isotopes.…”