DECAY OF Au<sup>196<i>m</i></sup>

Kavanagh, Thomas M.

doi:10.1139/p60-149

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The ground-state decay was found to have a small branch for β − decay, resulting in the emission of a 426 keV photon, with the rest of the γ-ray activity associated with the predominant EC decay [55][56][57]. A small branch for the EC decay of the metastable state was proposed [52], but could not be reproduced [41] (see section 5.6).…”

Section: Properties Of the Relevant Gold Isotopesmentioning

confidence: 99%

“…Conversion electron and scintillation spectrometry of characteristic emissions in the decay of the shorter-lived activity (halflife = 10.0 ± 0.5 h) established that it underwent isomeric transition, and identified four γ transitions in cascade, one of which (175 keV) was a highly converted M4 transition that governs the decay rate. Several papers published in 1960 reported a half-life of approximately 10 h [51,52], and that the 197 Au(n, 2n) reaction produced a more favorable isomer ratio than did the 196 Pt(d, 2n), 197 Au(γ, n) [51], or high-energy 197 Au(p, pn) [53] reactions. An atomic beam experiment established that the ground state of 196 Au had a spin of 2 [54]; thus, the multipolarities of the internal transition photons in cascade required that the spin of the isomer be  11 [51,52].…”

Section: Properties Of the Relevant Gold Isotopesmentioning

confidence: 99%

“…Several papers published in 1960 reported a half-life of approximately 10 h [51,52], and that the 197 Au(n, 2n) reaction produced a more favorable isomer ratio than did the 196 Pt(d, 2n), 197 Au(γ, n) [51], or high-energy 197 Au(p, pn) [53] reactions. An atomic beam experiment established that the ground state of 196 Au had a spin of 2 [54]; thus, the multipolarities of the internal transition photons in cascade required that the spin of the isomer be  11 [51,52]. The ground-state decay was found to have a small branch for β − decay, resulting in the emission of a 426 keV photon, with the rest of the γ-ray activity associated with the predominant EC decay [55][56][57].…”

Section: Properties Of the Relevant Gold Isotopesmentioning

confidence: 99%

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Nuclear spectrometry of 9.6 h ¹⁹⁶Au^m2 and the reaction of ¹⁹⁷Au with fast neutrons

Moody

Gharibyan

Shaughnessy

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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The neutron activation of gold is the basis of an implosion performance diagnostic at the National Ignition Facility at Lawrence Livermore National Laboratory. In support of this diagnostic, a series of γ-ray spectrometric measurements of the decay of 196Au m2 (J π = 12−) was performed to improve the currently accepted literature values of the nuclear data associated with its half-life, γ-ray energies, and γ-ray intensities. It was determined that 196Au m2 decays with a half-life of 9.603 h ± 0.23%. The relative intensities of the γ rays emitted during its decay were also measured, and an absolute decay branch of 0.3352 ± 2.9% was determined for the emission of the 188.2 keV photon, which arises from a nuclear transition whose multipolarity is predominantly M1. Properties of other products arising in the reaction of 197Au with fast neutrons were measured, as were selected production cross sections. The 196Au m2/196Au g isomer ratio measured in the 197Au(n, 2n) reaction at 14.1 MeV was found to be 0.0731 ± 2.6%.

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