{gamma}-ray spectroscopy study of states in {sup 27}Si relevant for the {sup 26}Al{sup m}(p,{gamma}){sup 27}Si reaction in novae and supernovae
- University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
- Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The heavy-ion, fusion-evaporation reaction {sup 12}C({sup 16}O,n) was used to identify {gamma}-decay transitions from excited states in {sup 27}Si above the proton threshold. The precise level energy measurements, J{sup {pi}} assignments, and lifetime measurements of astrophysically important {sup 26}Al{sup m}+p resonances have allowed an evaluation of the {sup 26}Al{sup m}(p,{gamma}){sup 27}Si reaction rate. An l{sub p}=0 resonance has been newly identified at a center-of-mass energy in the {sup 26}Al{sup m}+p system of 146.3(3) keV and is expected to dominate the rate for low stellar temperatures. In addition, an l{sub p}=1 resonance has been identified at 378.3(30) keV and is likely to dominate the rate at high astrophysical temperatures, such as those found in oxygen-neon novae and core-collapse supernovae.
- OSTI ID:
- 21296540
- 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
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Related Subjects
A CENTERS
ALUMINIUM 26
ASTROPHYSICS
CARBON 12 TARGET
EXCITED STATES
GAMMA DECAY
GAMMA SPECTROSCOPY
HEAVY ION FUSION REACTIONS
HEAVY IONS
KEV RANGE 100-1000
LIFETIME
MASS
NEON
NEUTRON EMISSION
NOVAE
OXYGEN 16
OXYGEN 16 REACTIONS
PROTONS
REACTION KINETICS
RESONANCE
SILICON 27
SUPERNOVAE