High-precision (p,t) reaction measurement to determine {sup 18}Ne({alpha},p){sup 21}Na reaction rates

Journal Article · Sun Nov 15 04:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.055804· OSTI ID:21296542

Matic, A; Berg, A M. van den; Harakeh, M N; Woertche, H J; Berg, G P. A.; Couder, M; Fisker, J L; Goerres, J; LeBlanc, P; O'Brien, S; Wiescher, M; Fujita, K; Hatanaka, K; Sakemi, Y; Shimizu, Y; Tameshige, Y; Tamii, A; Yosoi, M; Adachi, T; Fujita, Y ^[1]

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1. Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen (Netherlands)

x-ray bursts are identified as thermonuclear explosions in the outer atmosphere of accreting neutron stars. The thermonuclear runaway is fueled by the {alpha}p process that describes a sequence of ({alpha},p) reactions triggered by the {sup 18}Ne({alpha},p){sup 21}Na breakout reaction from the hot CNO cycles. We studied the level structure of the compound nucleus {sup 22}Mg by measuring the {sup 24}Mg(p,t){sup 22}Mg reaction at the Grand Raiden spectrometer at Research Center for Nuclear Physics, Osaka. A large number of {alpha}-unbound states was identified and precise excitation energies were determined. Based on shell model and {alpha}-cluster model calculations we predict the level parameters for determining the stellar reaction rate of {sup 18}Ne({alpha},p){sup 21}Na for a wide temperature range. x-ray burst simulations have been performed to study the impact of the reaction on the x-ray burst luminosity.

• OSTI ID: 21296542
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
ALPHA REACTIONS
ATMOSPHERES
CLUSTER MODEL
CNO CYCLE
COMPOUND NUCLEI
EXCITATION
LUMINOSITY
MAGNESIUM 22
MAGNESIUM 24 TARGET
NEON 18
NEUTRON STARS
NUCLEAR PHYSICS
PROTON REACTIONS
PROTON-EMISSION DECAY
REACTION KINETICS
SHELL MODELS
SIMULATION
SODIUM 21
SPECTROMETERS
TEMPERATURE RANGE
THERMONUCLEAR EXPLOSIONS
TRITONS
X RADIATION