{sup 24}Mg({alpha},{gamma}){sup 28}Si resonance parameters at low {alpha}-particle energies

Journal Article · Thu May 15 04:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.055801· OSTI ID:21190016

Strandberg, E; Beard, M; Couder, M; Couture, A; Falahat, S; Goerres, J; LeBlanc, P J; Lee, H Y; O'Brien, S; Palumbo, A; Stech, E; Tan, W P; Ugalde, C; Wiescher, M; Costantini, H; Scheller, K; Pignatari, M; Azuma, R; Buchmann, L ^[1]

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1. University of Notre Dame, Notre Dame, Indiana 46556 (United States)

The reaction {sup 24}Mg({alpha},{gamma}){sup 28}Si is involved in the nucleosynthesis of {sup 24}Mg and {sup 28}Si in massive stars. The reaction has not been examined with sufficient sensitivity at {alpha}-particle energies below 1.5 MeV. Several {sup 28}Si states appear favorable for formation by this reaction in the {alpha}-particle energy range of 1.0-1.5 MeV, motivating a new study of this reaction at the University of Notre Dame. To maximize experimental sensitivity, a high efficiency coincidence detection system was developed. Several previously unknown resonances were observed between 1.1 and 1.5 MeV, and an upper limit for any lower energy resonances was obtained. Resonance parameters were determined and reaction rates were calculated. The astrophysical implications of these results are discussed.

• OSTI ID: 21190016
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ASTROPHYSICS
COMPUTER CALCULATIONS
DETECTION
EFFICIENCY
GAMMA DECAY
MAGNESIUM 24 TARGET
MASS NUMBER
MEV RANGE 01-10
NUCLEOSYNTHESIS
REACTION KINETICS
RESONANCE
SENSITIVITY
SILICON 28
STARS