Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-12-28
Phys.Rev.C82:058801,2010
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Published in Physical Review C, 9 Pages, 2 Figures
Scientific paper
10.1103/PhysRevC.82.058801
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.
Chiba Satoshi
Hayakawa Tadaaki
Kajino Taka
Mathews Grant J.
Mohr Paul
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