High-precision {sup 28}Si(p,t){sup 26}Si reaction to determine {sup 22}Mg({alpha},p){sup 25}Al reaction rates

Journal Article · Mon Aug 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.025801· OSTI ID:21596704

Matic, A; Berg, A M. van den; Harakeh, M N; Woertche, H J; Beard, M; Berg, G P. A.; 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; Shimbara, Y ^[1]

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

The rise time of stellar x-ray bursts is a signature of thermonuclear runaway processes in the atmosphere of neutron stars and is highly sensitive to a series of ({alpha},p) reactions via high-lying resonances in sd-shell nuclei. Lacking data for the relevant resonance levels, the stellar reaction rates have been calculated using statistical, Hauser-Feshbach models, assuming a high-level density. This assumption may not be correct in view of the selectivity of the ({alpha},p) reaction to natural parity states. We measured the {sup 28}Si(p,t){sup 26}Si reaction with a high-resolution spectrometer to identify resonance levels in {sup 26}Si above the {alpha}-emission threshold at 9.164 MeV excitation energy. These resonance levels are used to calculate the stellar reaction rate of the {sup 22}Mg({alpha},p){sup 25}Al reaction and to test the validity of the statistical assumption.

• OSTI ID: 21596704
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
ALKALINE EARTH ISOTOPES
ALPHA REACTIONS
ALUMINIUM 25
ALUMINIUM ISOTOPES
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DECAY
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY RANGE
ENERGY-LEVEL DENSITY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
HADRON REACTIONS
HAUSER-FESHBACH THEORY
IONIZING RADIATIONS
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNESIUM 22
MAGNESIUM ISOTOPES
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 01-10
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PROTON REACTIONS
PROTON-EMISSION DECAY
PULSE RISE TIME
RADIATIONS
RADIOISOTOPES
REACTION KINETICS
RESOLUTION
RESONANCE
SECONDS LIVING RADIOISOTOPES
SILICON 26
SILICON 28 TARGET
SILICON ISOTOPES
SPECTROMETERS
TARGETS
TIMING PROPERTIES
X RADIATION