| Autor: |
B, Gao, S, Giraud, K A, Li, A, Sieverding, R G T, Zegers, X, Tang, J, Ash, Y, Ayyad-Limonge, D, Bazin, S, Biswas, B A, Brown, J, Chen, M, DeNudt, P, Farris, J M, Gabler, A, Gade, T, Ginter, M, Grinder, A, Heger, C, Hultquist, A M, Hill, H, Iwasaki, E, Kwan, J, Li, B, Longfellow, C, Maher, F, Ndayisabye, S, Noji, J, Pereira, C, Qi, J, Rebenstock, A, Revel, D, Rhodes, A, Sanchez, J, Schmitt, C, Sumithrarachchi, B H, Sun, D, Weisshaar |
| Rok vydání: |
2020 |
| Zdroj: |
Physical review letters. 126(15) |
| ISSN: |
1079-7114 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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