Resonances in 19Ne with relevance to the astrophysically important 18F(p,$\alpha$)15O reaction
| Autor: | Nicolas de Séréville, C. Angulo, Pedja Ujic, O. Kamalou, Alexander Murphy, F. de Oliveira, L. Achouri, P. J. Woods, D. J. Mountford, T. Davinson, Pierre Descouvemont, J. R. Brown, S. T. Pittman, Alison Laird |
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| Přispěvatelé: | Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Physics
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] Nuclear Theory [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Gamma ray [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] 7. Clean energy Nuclear physics Formalism (philosophy of mathematics) medicine.anatomical_structure Astrophysics - Solar and Stellar Astrophysics medicine Nuclear Experiment Nucleus |
| Zdroj: | PoS-Proceedings of Science VI European Summer School on Experimental Nuclear Astrophysics VI European Summer School on Experimental Nuclear Astrophysics, Sep 2011, Acireale, Italy. pp.050 Physical Review C Physical Review C, American Physical Society, 2012, 85, pp.022801. ⟨10.1103/PhysRevC.85.022801⟩ Physical Review C, 2012, 85, pp.022801. ⟨10.1103/PhysRevC.85.022801⟩ |
| ISSN: | 2469-9985 2469-9993 |
| Popis: | The most intense gamma-ray line observable from novae is likely to be from positron annihilation associated with the decay of 18F. The uncertainty in the destruction rate of this nucleus through the 18F(p,{\alpha})15O reaction presents a limit to interpretation of any future observed gamma-ray flux. Direct measurements of the cross section of both this reaction and the 18F(p,p)18F reaction have been performed between center of mass energies of 0.5 and 1.9 MeV. Simultaneous fits to both data sets with the R-Matrix formalism reveal several resonances, with the inferred parameters of populated states in 19Ne in general agreement with previous measurements. Of particular interest, extra strength has been observed above ECM \sim1.3 MeV in the 18F(p,p)18F reaction and between 1.3-1.7 MeV in the 18F(p,{\alpha})15O reaction. This is well described by a broad 1/2+ state, consistent with both a recent theoretical prediction and an inelastic scattering measurement. The astrophysical implications of a broad sub-threshold partner to this state are discussed. Comment: 7 pages, 4 figures, 2 tables |
| Databáze: | OpenAIRE |
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