$New ^{59}Fe Stellar Decay Rate with Implications for the ^{60}Fe Radioactivity in Massive Stars$

New ^{59}Fe Stellar Decay Rate with Implications for the ^{60}Fe Radioactivity in Massive Stars

The discrepancy between observations from γ-ray astronomy of the ^{60}Fe/^{26}Al γ-ray flux ratio and recent calculations is an unresolved puzzle in nuclear astrophysics. The stellar β-decay rate of ^{59}Fe is one of the major nuclear uncertainties impeding us from a precise prediction. The importan...

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Veröffentlicht in:	Physical review letters 2021-04, Vol.126 (15), p.152701-152701
Hauptverfasser:	Gao, B, Giraud, S, Li, K A, Sieverding, A, Zegers, R G T, Tang, X, Ash, J, Ayyad-Limonge, Y, Bazin, D, Biswas, S, Brown, B A, Chen, J, DeNudt, M, Farris, P, Gabler, J M, Gade, A, Ginter, T, Grinder, M, Heger, A, Hultquist, C, Hill, A M, Iwasaki, H, Kwan, E, Li, J, Longfellow, B, Maher, C, Ndayisabye, F, Noji, S, Pereira, J, Qi, C, Rebenstock, J, Revel, A, Rhodes, D, Sanchez, A, Schmitt, J, Sumithrarachchi, C, Sun, B H, Weisshaar, D
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creator	Gao, B Giraud, S Li, K A Sieverding, A Zegers, R G T Tang, X Ash, J Ayyad-Limonge, Y Bazin, D Biswas, S Brown, B A Chen, J DeNudt, M Farris, P Gabler, J M Gade, A Ginter, T Grinder, M Heger, A Hultquist, C Hill, A M Iwasaki, H Kwan, E Li, J Longfellow, B Maher, C Ndayisabye, F Noji, S Pereira, J Qi, C Rebenstock, J Revel, A Rhodes, D Sanchez, A Schmitt, J Sumithrarachchi, C Sun, B H Weisshaar, D
description	The discrepancy between observations from γ-ray astronomy of the ^{60}Fe/^{26}Al γ-ray flux ratio and recent calculations is an unresolved puzzle in nuclear astrophysics. The stellar β-decay rate of ^{59}Fe is one of the major nuclear uncertainties impeding us from a precise prediction. The important Gamow-Teller strengths from the low-lying states in ^{59}Fe to the ^{59}Co ground state are measured for the first time using the exclusive measurement of the ^{59}Co(t,^{3}He+γ)^{59}Fe charge-exchange reaction. The new stellar decay rate of ^{59}Fe is a factor of 3.5±1.1 larger than the currently adopted rate at T=1.2 GK. Stellar evolution calculations show that the ^{60}Fe production yield of an 18 solar mass star is decreased significantly by 40% when using the new rate. Our result eliminates one of the major nuclear uncertainties in the predicted yield of ^{60}Fe and alleviates the existing discrepancy of the ^{60}Fe/^{26}Al ratio.
doi_str_mv	10.1103/PhysRevLett.126.152701
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title	New ^{59}Fe Stellar Decay Rate with Implications for the ^{60}Fe Radioactivity in Massive Stars
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