Reanalysis of the (J = 5) state at 592 keV in 180Ta and its role in the neutrino-process nucleosynthesis of 180Ta in supernovae

Abstract

We analyze the production and freeze-out of the isomer 180Tam in the neutrino-process. We consider the influence of a possible low-lying intermediate (J = 5) state at 592 keV using a transition width estimated from the measured half-life. This more realistic width is much smaller than the previous estimate.We find that the 592-keV state leads only to a small reduction of the residual isomer population ratio from the previous result; that is, considering this better estimate for the transition width, the isomer population ratio changes from R = 0.39 to R = 0.38, whereas previously it was estimated that this transition could reduce the ratio to R = 0.18. This finding strengthens the evidence that 138La and 180Ta are coproduced by neutrino nucleosynthesis with an electron neutrino temperature of kT~4 MeV.

Published in Physical Review C, 9 Pages, 2 Figures

References in corpus (3)

• Survival of Nature's Rarest Isotope 180Ta under Stellar Conditions
• New estimate for the time-dependent thermal nucleosynthesis of ${}^{180}$Ta${}^m$
• Modification of nuclear transitions in stellar plasma by electronic processes: K-isomers in 176Lu and 180Ta under s-process conditions

Cited by in corpus (7)

• Comparative analysis of SN1987A antineutrino fluence
• Neutrinos and nucleosynthesis of elements
• The $\nu$-process with fully time-dependent supernova neutrino emission spectra
• Constraints on the decay of ${}^{180m}$Ta
• Nuclear Weak Rates and Nuclear Weak Processes in Stars
• Alpha decay law of excited nuclei and its role in stellar decay rates
• Neutrino-induced reactions on 18O and implications of 18O mixture in water Cherenkov detectors on supernova neutrino events