Neutron spectroscopy of 26Mg states: constraining the stellar neutron sources 22Ne(a,n)25Mg
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Massimi, C.
Altstadt, S.
Andrzejewski, J.
Audouin, L
Barbagallo, M
Becares, V
Becvar, F
Belloni, F
Berthoumieux, E.
Billowes, J.
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Elsevier B.V.
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This work reports on accurate, high-resolution measurements of the 25Mg()26Mg and 25Mg() cross sections in the neutron energy range from thermal to about 300 keV, leading to a significantly improved 25Mg()26Mg parametrization. The relevant resonances for Mg 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()25Mg and 22Ne()26Mg were established, potentially leading to a significantly higher ratio than previously evaluated. The impact of these results has been studied for stellar models in the mass range 2 to 25 .
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Physics Letters B
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Creative Commons License (Attribution 4.0 International)
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