Study of the 25Mg(d,p)26Mg reaction to constrain the 25Al(p,γ)26Si resonant reaction rates in nova burning conditions

The rate of the 25 Al( p ,  γ ) 26 Si reaction is one of the few key remaining nuclear uncertainties required for predicting the production of the cosmic γ -ray emitter 26 Al in explosive burning in novae. This reaction rate is dominated by three key resonances ( J π = 0 + , 1 + and 3 + ) in 26 Si....

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2020, Vol.56 (2)
Main Authors: Hamill, C. B., Woods, P. J., Kahl, D., Longland, R., Greene, J. P., Marshall, C., Portillo, F., Setoodehnia, K.
Format: Article
Language:English
Subjects:
Burning rate
Emitters
Hadrons
Heavy Ions
Nuclear Fusion
Nuclear Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Regular Article - Experimental Physics
Resonance
Spectroscopy
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Summary:The rate of the 25 Al( p ,  γ ) 26 Si reaction is one of the few key remaining nuclear uncertainties required for predicting the production of the cosmic γ -ray emitter 26 Al in explosive burning in novae. This reaction rate is dominated by three key resonances ( J π = 0 + , 1 + and 3 + ) in 26 Si. Only the 3 + resonance strength has been directly constrained by experiment. A high resolution measurement of the 25 Mg( d ,  p ) reaction was used to determine spectroscopic factors for analog states in the mirror nucleus, 26 Mg. A first spectroscopic factor value is reported for the 0 + state at 6.256 MeV, and a strict upper limit is set on the value for the 1 + state at 5.691 MeV, that is incompatible with an earlier ( 4 He,  3 He) study. These results are used to estimate proton partial widths, and resonance strengths of analog states in 26 Si contributing to the 25 Al( p ,  γ ) 26 Si reaction rate in nova burning conditions.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/s10050-020-00052-9