Transient field measurements of first-excited stateg-factors in188,190,192Os

“…[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.…”

Section: Transient-field Impacmentioning

confidence: 99%

“…Evaluating angular correlations for rectangular particle detectors Experience over several decades has shown that for transitions of known multipolarity (usually pure E2 transitions or mixed E2/M 1 transitions with known mixing ratio), the particle-γ angular correlations after Coulomb excitation can be calculated accurately. This experience was initially accumulated using annular surface barrier detectors in backscatter (or conventional kinematics) geometry [23, 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40]. This appendix summarizes some technical aspects of evaluating statistical tensors and angular correlations for rectangular particle detectors in Coulomb excitation experiments, based on the de Boer-Winther code [89].…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…For 'safe' Coulomb excitation measurements [22], and with the excited nuclei implanted into a medium that does not perturb the spin alignment (typically a cubic metal), the angular correlation, and hence S(θ γ ), can be calculated precisely; for examples see Refs. [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.…”

Section: Transient-field Impacmentioning

confidence: 99%

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

Stuchbery

Harding

Weisser

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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The design and operation of apparatus for measurements of in-beam hyperfine interactions and nuclear excited-state g factors is described. This apparatus enables a magnetic field of about 0.1 tesla to be applied to the target and the target temperature to be set between ∼ 4 K and room temperature. Design concepts are developed mainly in terms of transient-field g-factor measurements following Coulomb excitation by the implantation perturbed angular correlation (IMPAC) technique. The formalism for perturbed angular correlations is outlined and a figure of merit for optimizing these measurements is derived to inform design. Particle detection is based on the use of silicon photodiodes of rectangular shape. The particle-γ angular correlation formalism for this case is described. The experimental program to date includes temperature-dependent studies of hyperfine fields, transient-field g-factor measurements, and time-dependent perturbed angular distribution (TDPAD) studies.

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“…Details of the targets appear in Table 2. Most of the targets had been used previously for studies of transient fields, static fields or for measuring g-factors (Anderssen and Stuchbery 1995;Stuchbery et al . 1992Stuchbery et al .…”

Section: (4a) Measurements Performedmentioning

confidence: 99%

Hyperfine Magnetic Fields for Os, Ir and Pt in Iron: Pre-equilibrium Effects, Domain Rotation and the Aharoni Effect

Stuchbery¹,

Bezak²

1998

Aust. J. Phys.

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Hyperfine fields acting on subnanosecond excited states of impurity nuclei recoil-implanted into ferromagnetic hosts are being studied. These measurements are sensitive to effects on the picosecond time-scale that accompany implantation as well as to phenomena of longer duration. We review our recent work, mainly on 5d impurities implanted into iron, which has concerned: (i) the behaviour of the transient field at low recoil velocities, (ii) the dependence (magnitude and direction) of the hyperfine field on the applied field, (iii) the site distribution of the implanted nuclei, and (iv) the time the static field takes to reach equilibrium after implantation. It is found that the static hyperfine field takes about 10 ps after implantation to reach equilibrium. Once equilibrium is established the internal fields may be misaligned with respect to the direction of the external field, but this is associated with domain rotation in an incompletely saturated sample rather than with the ‘Aharoni effect’.

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Transient field measurements of first-excited stateg-factors in188,190,192Os

Cited by 14 publications

References 14 publications

Nuclear g factors and structure of high-spin isomers in 190,192,194Pt and 196,198Hg

Nuclear g factors and structure of high-spin isomers in 190,192,194Pt and 196,198Hg

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

Hyperfine Magnetic Fields for Os, Ir and Pt in Iron: Pre-equilibrium Effects, Domain Rotation and the Aharoni Effect

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