Identification of γ rays from Au172 and α decays of Au172, Ir168, and Re164
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ID: 266980
2009
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Abstract
The very neutron deficient odd-odd nucleus $^{172}\mathrm{Au}$ was studied in reactions of 342 and 348 MeV $^{78}\mathrm{Kr}$ beams with an isotopically enriched $^{96}\mathrm{Ru}$ target. The $\ensuremath{\alpha}$ decays previously reported for $^{172}\mathrm{Au}$ were confirmed and the decay chain extended down to $^{152}\mathrm{Tm}$ through the discovery of a new $\ensuremath{\alpha}$-decaying state in $^{164}\mathrm{Re}$ [${E}_{\ensuremath{\alpha}}=5623(10)$ keV; ${t}_{1/2}={864}_{\ensuremath{-}110}^{+150}$ ms; ${b}_{\ensuremath{\alpha}}=3(1)%$]. Fine structure in these $\ensuremath{\alpha}$ decays of $^{172}\mathrm{Au}$ and $^{168}\mathrm{Ir}$ were identified. A new $\ensuremath{\alpha}$-decaying state was also observed and assigned as the ground state in $^{172}\mathrm{Au}$ [${E}_{\ensuremath{\alpha}}=6762(10)$ keV; ${t}_{1/2}={22}_{\ensuremath{-}5}^{+6}$ ms]. This decay chain was also correlated down to $^{152}\mathrm{Tm}$ through previously reported $\ensuremath{\alpha}$ decays. Prompt $\ensuremath{\gamma}$ rays from excited states in $^{172}\mathrm{Au}$ have been identified using the recoil-decay tagging technique. The partial level scheme constructed for $^{172}\mathrm{Au}$ indicates that it has an irregular structure. Possible configurations of the $\ensuremath{\alpha}$-decaying states in $^{172}\mathrm{Au}$ are discussed in terms of the systematics of nuclei in this region and total Routhian surface calculations.
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2009physicalidentification
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| Journal | physical review c |
| Year | 2009 |
| DOI |
doi:10.1103/PhysRevC.80.064310
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