The $^{59}$Fe(n, {\gamma})$^{60}$Fe Cross Section from the Surrogate Ratio Method and Its Effect on the $^{60}$Fe Nucleosynthesis
| Autor: | Yan, S. Q., Li, X. Y., Nishio, K., Lugaro, M., Li, Z. H., Makii, H., Pignatari, M., Wang, Y. B., Orlandi, R., Hirose, K., Tsukada, K., Mohr, P., Li, G. S., Wang, J. G., Gao, B. S., Han, Y. L., Guo, B., Li, Y. J., Shen, Y. P., Sato, T. K., Ito, Y., Suzaki, F., Su, J., Yang, Y. Y., Wang, J. S., Ma, J. B., Ma, P., Bai, Z., Xu, S. W., Ren, J., Fan, Q. W., Zeng, S., Han, Z. Y., Nan, W., Nan, W. K., Chen, C., Lian, G., Hu, Q., Duan, F. F., Jin, S. Y., Tang, X. D., Liu, W. P. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4357/ac12ce |
| Popis: | The long-lived $^{60}$Fe (with a half-life of 2.62 Myr) is a crucial diagnostic of active nucleosynthesis in the Milky Way galaxy and in supernovae near the solar system. The neutron-capture reaction $^{59}$Fe(n,$\gamma$)$^{60}$Fe on $^{59}$Fe (half-life = 44.5 days) is the key reaction for the production of $^{60}$Fe in massive stars. This reaction cross section has been previously constrained by the Coulomb dissociation experiment, which offered partial constraint on the $E$1 $\gamma$-ray strength function but a negligible constraint on the $M$1 and $E$2 components. In this work, for the first time, we use the surrogate ratio method to experimentally determine the $^{59}$Fe(n,$\gamma$)$^{60}$Fe cross sections in which all the components are included. We derived a Maxwellian-averaged cross section of 27.5 $\pm$ 3.5 mb at $kT$= 30 keV and 13.4 $\pm$ 1.7 mb at $kT$= 90 keV, roughly 10 - 20% higher than previous estimates. We analyzed the impact of our new reaction rates in nucleosynthesis models of massive stars and found that uncertainties in the production of $^{60}$Fe from the $^{59}$Fe(n,$\gamma$)$^{60}$Fe rate are at most of 25%. We conclude that stellar physics uncertainties now play a major role in the accurate evaluation of the stellar production of $^{60}$Fe. Comment: 9 pages with 6 figures |
| Databáze: | arXiv |
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