Perturbed angular correlations for Gd in gadolinium: In-beam comparisons of relative magnetizations

Abstract

Perturbed angular correlations were measured for Gd ions implanted into gadolinium foils following Coulomb excitation with 40 MeV 16 O beams. A technique for measuring the relative magnetizations of ferromagnetic gadolinium hosts under inbeam conditions is described and discussed. The combined electric-quadrupole and magnetic-dipole interaction is evaluated. The effect of nuclei implanted onto damaged or non-substitutional sites is assessed, as is the effect of misalignment between the internal hyperfine field and the external polarizing field. Thermal effects due to beam heating are discussed.

Firstg(2+)measurement on neutron-rich72Zn, and the high-velocity transient field technique for radioactive heavy-ion beams

“…The temperature dependence and sensitivity to the applied field was investigated. From both the in-beam and off-line measurements it was concluded that, under the conditions of the HVTF experiment, the magnetization of the 204 mg/cm 2 gadolinium foil was at least 85% of that routinely achieved in transient-field measurements using thinner foils [35]. Note that a reduced magnetization will reduce the magnitude of the observed transient-field precession, but have no direct consequence for the measurement of the 72 Zn g factor relative to that of 76 Ge.…”

“…Along with the magnetometer measurements, the magnetic behavior of gadolinium foils was therefore also measured in-beam at the Australian National University using 40 MeV 16 O beams from the ANU 14UD Pelletron and procedures as described in Ref. [35]. The temperature dependence and sensitivity to the applied field was investigated.…”

First-excited state g factors in the stable, even Ge and Se isotopes

“…Precession angles were evaluated as per Eq. (2), with S(θ γ ) calculated from angular correlation theory [40,41,43]. The measured precession angles are listed in Table II.…”

“…Such symmetrically placed particle and γ-ray detectors should have ρ values distributed around unity (or distributed around zero); departures from the null effect can indicate systematic errors. The angular correlations were computed using routines based on the Winther-de Boer code [39] in order to determine the value of S(θ γ ) [12,40,41], as the nuclei of interest were Coulomb-excited with known reaction geometry. The angular correlations were also measured in several cases to verify the calculations and experimental procedures.…”

gfactor of the first excited state inFe56and implications for transient-field calibration in the Fe region

“…Refs. [20,22,23]; however, here the calculations were modified for inverse kinematics. For the mixed-multipolarity 122 keV 5/2 − → 3/2 − transition in 57 Fe, the mixing ratio was taken from Ref.…”