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Resonances in 19Ne with relevance to the astrophysically important 18F(p,$\alpha$)15O reaction

By D. Mountford, A.St J. Murphy, T. Davinson, P.J. Woods, N.L. Achouri, C. Angulo, J.R. Brown, A.M. Laird, Francois de Oliveira Santos, O. Kamalou, P. Ujic, N. De Séréville, P. Descouvemont and S.T. Pittman

Abstract

International audienceThe main source of gamma ray emission from novae below 511 keV is likely to be associated with the beta+ decay of 18F. The main uncertainty in the abundance of this nucleus comes from the 18F(p,alpha)15O reaction. In 2006, through microscopic techniques, two previously unseen energy levels in the compound 19Ne nucleus, at 6 and 7.9 MeV were proposed by Dufour and Descouvemont. In light of this there have been two published attempts in the search for the higher of these states, by Murphy et al. and Dalouzy et al.. The aim of this work is to address the contradiction between these works and come to a conclusion as to the possible existence of this state. An experiment has taken place that utilised a 4 MeV/u 18F beam, degraded to 1.9 MeV/u, incident upon a thick CH2 target. The data has been analysed within the R-matrix formalism and preliminary results are presented here

Topics: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Publisher: HAL CCSD
Year: 2011
OAI identifier: oai:HAL:in2p3-00702716v1
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