Fig 4 - uploaded by Bichitra Ganguly
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Decay scheme of 111m Cd 48 , IT, T 1/2 = 48.54 m, isomeric level with 5/2 + spin where EFG tensor interacts with nuclear quadrupole moment Q, an illustration of the typical PAC measurement.
Source publication
The structural characterization of sol-gel based nano crystalline ZnO
material is being reported as we observe several previously unreported
structural aspects following a sequence of annealing stages. As-grown samples
were characterised by Fourier Transform Infrared Spectroscopy (FTIR). Chemical
purity of the nano-grains and their crystallinity ha...
Contexts in source publication
Context 1
... PAC machine consists of a setup of usually four or six detectors which measure the time difference between the c 1 and c 2 -ray as shown in Fig. 4, from which the radioactive decay curve of the inter- mediate level of 111m Cd with a life time of %84.5 ns has been obtained. Due to the anisotropy of the emitted radiation, ripples on the decay curve become visible when electric quadrupole or/and magnetic dipole interaction, e.g. electric field gradient (EFG) or local magnetic fields in magnetic materials, are non-zero as shown in Fig. 4 (see in the middle). The counting rate ratio, R(t), is obtained from the coincidence data ...
Context 2
... PAC machine consists of a setup of usually four or six detectors which measure the time difference between the c 1 and c 2 -ray as shown in Fig. 4, from which the radioactive decay curve of the inter- mediate level of 111m Cd with a life time of %84.5 ns has been obtained. Due to the anisotropy of the emitted radiation, ripples on the decay curve become visible when electric quadrupole or/and magnetic dipole interaction, e.g. electric field gradient (EFG) or local magnetic fields in magnetic materials, are non-zero as shown in Fig. 4 (see in the middle). The counting rate ratio, R(t), is obtained from the coincidence data ...
Context 3
... time differential perturbed angular correlation technique is based on the modulation of angular correlation of the successive radiations emitted during a nuclear decay cascade due to hyperfine interactions between the electromagnetic moments of the intermediate nuclear level with its immediate neighboring elec- tronic environment. Suitable isotopes for standard PAC have an intermediate level (sensitive level) which has a half-life between 10 and 1000 ns (see Fig. 4), while the half-life of the parent isotope is sufficiently long lived to provide a measurement. 111 In with a 2.8 days half-life and simple cascade is one of the most and widely-used PAC probes. However, the so-called after effects, resulting from the change of electronic charge state from 111 In 3+ to 111 Cd 2+ , can be problematic especially in semiconductors [30]. In order to minimize these effects, the 111m Cd 2+ radioactive ion is more suitable as it does not undergo any such transmutation. However, its short half life of 48 min restricts its availability to on-site measurements at a facility such as ISOLDE at ...
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Nano-crystalline ZnO has been studied with perturbed angular correlation using 111mCd, implanted at ISOLDE/CERN and X-ray diffraction using Rietveld analysis. The data show a gradual increase in the crystal size and stress for a sample annealed at 600 °C, and reaching nearly properties of standard ZnO with tempering at 1000 °C. The perturbed angula...