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Neutron spectroscopy of ²⁶Mg states: Constraining the stellar neutron source ²²Ne(α,n)²⁵Mg
- Source :
- Physics letters / B
- Publication Year :
- 2017
- Publisher :
- North-Holland Publishing, 2017.
-
Abstract
- This work reports on accurate, high-resolution measurements of the 25Mg(n,γ)26Mg and 25Mg(n,tot) cross sections in the neutron energy range from thermal to about 300 keV, leading to a significantly improved 25Mg(n,γ)26Mg parametrization. The relevant resonances for n+25Mg were characterized from a combined R-matrix analysis of the experimental data. This resulted in an unambiguous spin/parity assignment of the corresponding excited states in 26Mg. With this information experimental upper limits of the reaction rates for 22Ne(α,n)25Mg and 22Ne(α,γ)26Mg were established, potentially leading to a significantly higher (α,n)/(α,γ) ratio than previously evaluated. The impact of these results has been studied for stellar models in the mass range 2 to 25 M⊙ .
Details
- Language :
- English
- ISSN :
- 03702693 and 18732445
- Database :
- OpenAIRE
- Journal :
- Physics letters / B
- Accession number :
- edsair.doi.dedup.....af24c0479a0b7430ddc6d904312a1ccf