Radiative capture reaction for Ne17 formation within a full three-body model

J. Casal, E. Garrido, R. de Diego, J. M. Arias, and M. Rodríguez-Gallardo
Phys. Rev. C 94, 054622 – Published 29 November 2016

Abstract

Background: The breakout from the hot Carbon-Nitrogen-Oxigen (CNO) cycles can trigger the rp-process in type I x-ray bursts. In this environment, a competition between O15(α,γ)Ne19 and the two-proton capture reaction O15(2p,γ)Ne17 is expected.

Purpose: Determine the three-body radiative capture reaction rate for Ne17 formation including sequential and direct, resonant and nonresonant contributions on an equal footing.

Method: Two different discretization methods have been applied to generate Ne17 states in a full three-body model: the analytical transformed harmonic oscillator method and the hyperspherical adiabatic expansion method. The binary pO15 interaction has been adjusted to reproduce the known spectrum of the unbound F16 nucleus. The dominant E1 contributions to the O15(2p,γ)Ne17 reaction rate have been calculated from the inverse photodissociation process.

Results: Three-body calculations provide a reliable description of Ne17 states. The agreement with the available experimental data on Ne17 is discussed. It is shown that the O15(2p,γ)Ne17 reaction rates computed within the two methods agree in a broad range of temperatures. The present calculations are compared with a previous theoretical estimation of the reaction rate.

Conclusions: It is found that the full three-body model provides a reaction rate several orders of magnitude larger than the only previous estimation. The implications for the rp-process in type I x-ray bursts should be investigated.

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  • Received 1 August 2016
  • Revised 5 October 2016

DOI:https://doi.org/10.1103/PhysRevC.94.054622

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

J. Casal1,2,*, E. Garrido3,†, R. de Diego4, J. M. Arias1, and M. Rodríguez-Gallardo1

  • 1Departamento de Física Atómica, Molecular y Nuclear, Facultad de Física, Universidad de Sevilla, Apartado 1065, E-41080 Sevilla, Spain
  • 2European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) and Fondazione Bruno Kessler, Villa Tambosi, Strada delle Tabarelle 286, I-38123 Villazzano (TN), Italy
  • 3Instituto de Estructura de la Materia, IEM-CSIC, Serrano 123, E-28006 Madrid, Spain
  • 4Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10 (Km 139,7), P-2695-066 Bobadela LRS, Portugal

  • *jcasal@us.es
  • e.garrido@csic.es

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Issue

Vol. 94, Iss. 5 — November 2016

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