Simultaneous measurement of the {sup 18}F(p,p){sup 18}F and {sup 18}F(p,{alpha}){sup 15}O reactions: Implications for the level structure of {sup 19}Ne, and for {sup 18}F production in novae
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
- Department of Physics, University of York, York YO10 5DD (United Kingdom)
- Tractebel Engineering, Avenue Ariane 7, B-1200 Brussels (Belgium)
- TRIUMF, Vancouver, V6T 2A3 (Canada)
- Physique Nucleaire Theorique et Physique Mathematique, CP229, Universite Libre de Bruxelles, B-1050 Brussels (Belgium)
- Departament de Fisica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, E-08036 and Institut d'Estudis Espacials de Catalunya, E-08034, Barcelona (Spain)
The largest nuclear physics uncertainty in studies of gamma-ray emission from novae arises from the {sup 18}F(p,{alpha}){sup 15}O reaction rate that affects the abundance of {sup 18}F. Direct measurements have been made of the {sup 18}F(p,p){sup 18}F and {sup 18}F(p,{alpha}){sup 15}O reaction differential cross sections in the energy range 0.6{<=}E{sub c.m.}{<=}1.6 MeV. Several resonances have been observed in both measurements, with simultaneous R-matrix fits used to determine the properties of corresponding states in {sup 19}Ne. A recently reported state at 7.420 MeV is not seen, while new states are seen including one of J{sup {pi}}=(3/2){sup +}. A candidate for a recently predicted broad J{sup {pi}}=(1/2){sup +} state is seen, which would have significant impact on the low energy {sup 18}F(p,{alpha}){sup 15}O reaction rate, but its alpha width is significantly smaller than expected.
- OSTI ID:
- 21286991
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 79, Issue 5; Other Information: DOI: 10.1103/PhysRevC.79.058801; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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