The nuclear g-factor of the 111 keV rotational level and other angular correlation measurements on W184

Gyromagnetic ratio of the 2+ rotational state of184W and observation of a large hyperfine anomaly with respect to183Wg in iron

“…The annealing at about 1300 K is according to recent recovery studies of tungsten [5,6] sufficiently high to expect that the damage produced by the cyclotron irradiation should be annealed. The attenuation in the liquid sample is astonishingly large but confirms an early result which was obtained for [ReO~,]-in dilute HNO 3 [7]. In order to check that the perturbation factor G4(t) follows a simple exponential function as predicted by Abragam and Pound [8] for liquid environments of short correlation times we performed a time differential measurement of the A4-coefficient by use of a fast time differential perturbed angular correlation (TDPAC) apparatus equipped with two 51mm x51mm CsF-detectors.…”

“…In order to clear up the discrepancy to an old IPAC measurement [7] where a liquid source had been used, we observed also the rotation of the 792-111 keV ~-7 angular correlation for the same magnetic field with our liquid source. This measurement was done with Ge-detectors in order to avoid background coincidences of other cascades.…”

Gyromagnetic ratios of the 4+ and 6+ rotational states of184W

“…Earlier measurements [25,26] were considered to be less reliable and not taken into account. CsF detectors coupled to RCA8850 phototubes which combine a fast optical decay constant, "gopt ~ 5 ns, with a photopeak efficiency which is close to that of NaI(Tl)-detectors because of the similar atomic numbers of cesium and iodine.…”

Half-life of 184Re populated by photodisintegration reaction with Laser Compton scattering γ-rays at NewSUBARU

“…Finally we obtain the half-life of 35.4 ± 0.7 d as the average value of these three γ-rays. Historically, the measurement of the half-life, 38 ± 1 d, was reported in 1960 [27]. The most precise half-life, 38.0 ± 0.5 d, was reported in 1962 [13] and this was widely taken as the recommended value.…”

“…After these studies, the isomer with a half-life of 169 d was found by a measurement of decay of activities populated by the neutron-induced reactions in a nuclear reactor. Therefore radioactive samples in the two historical studies [13,27] may include the isomer, but the effect of the isomer was not taken into account. After the discovery of the isomer, two half-lives, 33 ± 3 [14] and 34 ± 5 [28], were reported but their uncertainties are so large that the value of 38.0 ± 0.5 d is within the uncertainty range.…”