Discovery of a New Broad Resonance in $^{19}\mathrm{Ne}$: Implications for the Destruction of the Cosmic $\ensuremath{\gamma}$-Ray Emitter $^{18}\mathbf{F}$

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

J. C. Dalouzy, L. Achouri, M. Aliotta, C. Angulo, H. Benhabiles, C. Borcea, R. Borcea, P. Bourgault, A. Buta, A. Coc, A. Damman, T. Davinson, F. de Grancey, F. de Oliveira Santos, N. de Séréville, J. Kiener, M. G. Pellegriti, F. Negoita, A. M. Sánchez-Benítez, O. Sorlin, M. Stanoiu, I. Stefan, and P. J. Woods

Phys. Rev. Lett. 102, 162503 – Published 22 April 2009

Abstract

Six proton-emitting states in ${}^{19}{Ne}$ were studied through the inelastic scattering reaction $H ({}^{19}{Ne}, p) {}^{19}{Ne}^{*} (p) {}^{18}F$ . 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 $J = \frac{1}{2}$ resonance has been evidenced at $E_{x} \approx 7.9 MeV$ , $\approx 1.45 MeV$ above the proton emission threshold. By introducing this resonance, the ${}^{18}F (p, α) {}^{15}O$ destruction rate in novae is significantly enhanced. This reduces the chance to observe the cosmic $γ$ -ray emission of ${}^{18}F$ from novae in space telescopes.

Received 5 February 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.162503

Authors & Affiliations

J. C. Dalouzy¹, L. Achouri⁵, M. Aliotta², C. Angulo^3,*, H. Benhabiles⁶, C. Borcea⁴, R. Borcea⁴, P. Bourgault¹, A. Buta⁴, A. Coc⁶, A. Damman³, T. Davinson², F. de Grancey¹, F. de Oliveira Santos¹, N. de Séréville⁷, J. Kiener⁶, M. G. Pellegriti¹, F. Negoita⁴, A. M. Sánchez-Benítez³, O. Sorlin¹, M. Stanoiu⁴, I. Stefan^1,4, and P. J. Woods²

¹Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, France
²School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
³Centre de Recherche du Cyclotron, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
⁴Horia Hulubei National Institute of Physics and Nuclear Engineering, P.O. Box MG6, Bucharest-Margurele, Romania
⁵Laboratoire de Physique Corpusculaire ENSICAEN, CNRS-IN2P3 UMR 6534 et Université de Caen, F-14050 Caen, France
⁶CSNSM UMR 8609, CNRS-IN2P3/Université Paris-Sud, Bâtiment 104, 91405 Orsay Campus, France
⁷Institut de Physique Nucléaire UMR 8608, CNRS-IN2P3/Université Paris-Sud, F-91406 Orsay, France

^*Present address: Tractebel Engineering - Suez, Avenue Ariane 7, B-1200 Brussels, Belgium.

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Vol. 102, Iss. 16 — 24 April 2009

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Physical Review Letters

Discovery of a New Broad Resonance in Ne19: Implications for the Destruction of the Cosmic γ-Ray Emitter F18

Phys. Rev. Lett. 102, 162503 – Published 22 April 2009

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