Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α,n)25Mg
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⊙.
Item Type | Article |
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Additional information | This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Open Access funded by SCOAP³ - Sponsoring Consortium for Open Access Publishing in Particle Physics. C. Massimi, et al, 'Neuron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne (a,n) 25Mg', Physics Letters B, Vol. 768, first published online 16 February 2017. The version of record is available online at doi: http://dx.doi.org/10.1016/j.physletb.2017.02.025 © 2017 The Authors. Published by Elsevier B. V. |
Keywords | s process, α + 22 ne, neutron spectroscopy |
Date Deposited | 15 May 2025 13:26 |
Last Modified | 31 May 2025 00:10 |