Measurement of the 18Ne(α,p0) 21Na reaction cross section in the burning energy region for x-ray bursts

The 18Ne(α,p) 21Na reaction provides one of the main HCNO-breakout routes into the rp process in x-ray bursts. The 18Ne(α,p0) 21Na reaction cross section has been determined for the first time in the Gamow energy region for peak temperatures T∼2  GK by measuring its time-reversal reaction 21Na(p,α)...

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Published in:Physical review letters 2012-06, Vol.108 (24), p.242701-242701
Main Authors: Salter, P J C, Aliotta, M, Davinson, T, Al Falou, H, Chen, A, Davids, B, Fulton, B R, Galinski, N, Howell, D, Lotay, G, Machule, P, Murphy, A StJ, Ruiz, C, Sjue, S, Taggart, M, Walden, P, Woods, P J
Format: Article
Language:English
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Summary:The 18Ne(α,p) 21Na reaction provides one of the main HCNO-breakout routes into the rp process in x-ray bursts. The 18Ne(α,p0) 21Na reaction cross section has been determined for the first time in the Gamow energy region for peak temperatures T∼2  GK by measuring its time-reversal reaction 21Na(p,α) 18Ne in inverse kinematics. The astrophysical rate for ground-state to ground-state transitions was found to be a factor of 2 lower than Hauser-Feshbach theoretical predictions. Our reduced rate will affect the physical conditions under which breakout from the HCNO cycles occurs via the 18Ne(α,p) 21Na reaction.
ISSN:1079-7114