Magnetic moments of the 2 1 + states in102, 104Mo

Abstract

The g factors of the first excited 2 + levels in the neutron-rich nuclei 1~and 1~ have been studied through the measurement of the perturbed angular correlations for the 7-Y cascades between the 0~ -2+ -0 + level sequences. The results of g = 0.42_+ 0.07 for 1~and of .... +o.12 for 1~ g=t/.l~ '-0.11 agree with the prediction of the vibrationalrotational model. In terms of IBA, with the assumption of N~ = 3 for the Mo isotopes which takes into consideration a two particle, two-hole excitation across the Z=40 subshell, the proton-boson g factor is deduced to be g~ = 1.00___ 0.23. It is shown that this value provides evidence for subshell effects in l~176

A new technique for measuringgfactors of excited states in fission fragments using large arrays of Ge detectors

“…Using the precession angle of φ p = +0.316(21) rad and a hyperfine impurity field of B = −25.6(1) T for Mo atoms implanted in an Fe host [14], equation (2.2) revealed the g factor to be g = +0.248(22) (4.3) which is in good agreement with the previously measured value of g = +0.19 (11), as measured by Menzen et al [13], and which also represents a factor of 5 improvement to the precision with which the g factor has been previously measured.…”

“…To demonstrate the effective application of the techniques described above, results for the 2 + state in 104 Mo are presented as an example. The lifetime of the state is τ = 1.040(59) ns [8] and the g factor has previously been measured by Menzen et al [13] to be g = +0.19 (11).…”

The decay scheme of the 3-s Isomer of100Nb and the properties of levels in100Mo

“…3.3.) is similar to the one of the 504 keV transition following the //-decay of a~176 into ~~176 This is in accordance with the above-mentioned observation that the low-spin isomer of l~176 receives most of its intensity from the/3 decay of l~176 The distribution for the 536 keV line reflects the fact that the 2 + level of t~176 receives population of both decay modes of l~176 The details of the intensity distribution of this line depend on the ratio of the fission yields of l~176 and a~176 on the timing conditions of the gas jet and the moving-tape device which have been used [11] for the transport of the radioactive samples from the exit of JOSEF to the detector, and on the //-feeding into the individual levels of ~~176 The intensity distributions allowed to disentangle the feeding of levels of l~176 through the two decay modes of ~~176…”

“…For this purpose v-ray multiscaling measurements have been performed in which the intensities of the y lines as a function of time after arrival of the radioactive sources in front of the detector have been determined. Two different measurements have been undertaken with the separator set for the decay of a~176 and a~176 and with cycle times of the tape-transport device [10,11] of 35 and 43 s, respectively. These total cycle times were subdivided into time slices of 0.4 s. The determination of the decay curve of the 161 keV-7 transition in 97Zr from the decay of 97y with known half-life (1.21 s) was used as check.…”

Transition Probabilities and Static Moments in Transitional Nuclei

“…Additional evidence is provided by g(2+) data for 98 Sr, 100 Zr, 102 Mo." 13 Although B(E2) values do exist for these nuclei, we can not use them in the simple way described above because the analytical relations are not valid.…”