Back to Search
Start Over
The 59 Fe (n,γ) 60 Fe Cross Section from the Surrogate Ratio Method and Its Effect on the 60 Fe Nucleosynthesis
- Source :
- The Astrophysical Journal. 919(2):84
-
Abstract
- 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.<br />Comment: 9 pages with 6 figures
- Subjects :
- Physics
0303 health sciences
030309 nutrition & dietetics
Milky Way
Astronomy and Astrophysics
Astrophysics
Astrophysics - Astrophysics of Galaxies
01 natural sciences
7. Clean energy
3. Good health
Reaction rate
03 medical and health sciences
Cross section (physics)
Stars
Supernova
Stellar nucleosynthesis
13. Climate action
Space and Planetary Science
Nucleosynthesis
Stellar physics
0103 physical sciences
010303 astronomy & astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 15384357 and 0004637X
- Volume :
- 919
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....e4f9cd11319c4bb19a354fecbb8f7f4c
- Full Text :
- https://doi.org/10.3847/1538-4357/ac12ce