Discovery of a New Broad Resonance in {sup 19}Ne: Implications for the Destruction of the Cosmic {gamma}-Ray Emitter {sup 18}F

• Published in: Physical review letters Vol. 102; no. 16
• Main Authors: Dalouzy, J. C., Bourgault, P., Grancey, F. de, Oliveira Santos, F. de, Pellegriti, M. G., Sorlin, O., Achouri, L., Aliotta, M., Davinson, T., Woods, P. J., Angulo, C., Damman, A., Sanchez-Benitez, A. M., Benhabiles, H., Coc, A., Kiener, J., Borcea, C., Borcea, R., Buta, A., Negoita, F.
• Format: Journal Article
• Language: English
• Published: United States 24-04-2009
• Subjects: ANGULAR CORRELATION; EMISSION; FLUORINE 18; FLUORINE 18 TARGET; GAMMA RADIATION; INELASTIC SCATTERING; NEON 19; NOVAE; NUCLEAR PHYSICS AND RADIATION PHYSICS; OXYGEN 15; PROTON REACTIONS; PROTONS; RESONANCE; SPIN; TELESCOPES
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PHYSREVLETT.102.162503

Six proton-emitting states in {sup 19}Ne were studied through the inelastic scattering reaction H({sup 19}Ne,p){sup 19}Ne{sup *}(p){sup 18}F. Their energies and widths were derived from the protons detected at zero degree, while proton-proton angular correlations between the detector at zero degree and a segmented annular detector were used to determine their spin value. In addition to the known states, a new broad J=(1/2) resonance has been evidenced at E{sub x}{approx_equal}7.9 MeV, {approx_equal}1.45 MeV above the proton emission threshold. By introducing this resonance, the {sup 18}F(p,{alpha}){sup 15}O destruction rate in novae is significantly enhanced. This reduces the chance to observe the cosmic {gamma}-ray emission of {sup 18}F from novae in space telescopes.