Disparity of measured gyromagnetic ratios of ground- and excited-band states in184W

Abstract

Gyromagnetic ratios of levels in the ground-band and of the 2 2 state in lS4W were measured by means of the transient magnetic field perturbed 7-ray angular distribution technique. The levels of interest were Coulomb excited by beams of 220-MeV SSNi and 63Cu ions. The results show the g-factor of the 2 2 state to be approximately half the effectively constant value found for the ground-band levels. This disparity is compared with those previously obtained for the corresponding states in 188-192Os and l*6W; these are discussed in the context of the interacting boson model.

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

“…4. While only the overall transition intensity was adjusted to fit the data for the 548-keV E2 transition, the mixing ratios were also varied to fit the correlations for the mixed were also in agreement with those measured and are similar to those published for la4W in [13]. A partial level scheme of 197Au which incorporates several firm spin assignments determined in our related study [20,21] is shown in Fig.…”

“…While the extraction of the relative gyromagnetic ratios of levels in 197Au from the simultaneously measured TF precessions is rather straightforward [12][13][14]22], to obtain absolute g-factors of states in 197Au from the observed precession angles requires knowledge of the behaviour (velocity-dependent magnitude) of the TF for Au ions recoiling through the particular ferromagnetic host. In earlier publications [5,6,8] we discussed the abrupt discontinuity in TF strength which occurs between 76Os and 7sPt ions traversing polarized Fe hosts with velocities ~ 0.02 c. In contrast with TF studies using Fe hosts, no discontinuities [20,21].…”

“…Although the measured g-factors of the corresponding low-lying levels of the stable even lsz'~s4'~s6w isotopes are not the same, previous measurements [12,13,23] have established that the gfactors of the low-lying levels in the ground-band of any particular one of these isotopes are identical within experimental uncertainties. As the presence of these isotopes in the target was for the purpose of calibrating the TF strength, there was neither any advantage nor need to extract the separate contributions to the observed (re d) precessions of the individual g s b levels in any given even W isotope studied.…”

“…Such simultaneous measurements largely obviate possible sources of systematic errors. For the calibration of the TF strength in polarized Gd hosts, the known g-factors [8,12,13,16] of states in the even W isotopes were chosen, in preference to reliance upon the g-factors [5][6][7] of states in the even Pt nuclides which were the subject of the controversy noted above.…”

Apparatus for in-beam hyperfine interactions and g-factor measurements: Design and operation

“…[23, 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43]. One caveat on this statement is that S(θ γ ) is a very sensitive function of θ γ when the detectors are placed near the maximum slope of the angular correlation as is done for precession measurements.…”