Study of key resonances in the ³⁰P(p,γ)³¹S reaction in classical novae

¹ Institut de Physique Nucléaire, IN2P3/CNRS-Université de Paris XI, 91406 Orsay Cedex, France
² Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, E-08036 Barcelona, Spain
³ Centre des Sciences Nucléaires et des Sciences de la Matière (CSNSM), IN2P3/CNRS-Université de Paris XI, 91405 Campus Orsay, France
⁴ Department of Physics, The University of York, York YO10 5DD, United Kingdom
⁵ Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DRFCNRS/IN2P3, Bvd. Henri Becquerel, 14076 Caen, France
⁶ Institut des Sciences Moléculaires d’Orsay (ISMO), UMR 8214, CNRS, Université Paris Sud
⁷ Departamento de Ciencias Integradas, University of Huelva, 21071 Huelva, Spain
⁸ Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, São Paulo, 05508-090, Brazil
⁹ Laboratoire de Physique Théorique, Université Abderahmane Mira, 06000 Béjaia, Algeria
¹⁰ INFN-Laboratori Nazionali del Sud, Via S. Sofia, I-95125 Catania, Italy
¹¹ Dip. di Fisica e Astronomia, Università di Catania, Via S. Sofia, I-95125 Catania, Italy

^* e-mail: meyer@ipno.in2p3.fr

Published online: 29 June 2018

Abstract

Among reactions with strong impact on classical novae model predictions, ³⁰P(p,γ)³¹S is one of the few remained that are worthy to be measured accurately, because of their rate uncertainty, as like as ¹⁸F(p,α)¹⁵O and ²⁵Al(pγ)²⁶Si. To reduce the nuclear uncertainties associated to this reaction, we performed an experiment at ALTO facility of Orsay using the ³¹P(³He,t)³¹S reaction to populate ³¹S excited states of astrophysical interest and detect in coincidence the protons coming from the decay of the populated states in order to extract the proton branching ratios. After a presentation of the astrophysical context of this work, the current situation of the ³⁰P(p,γ)³¹S reaction rate will be discussed. Then the experiment set-up of this work and the analysis of the single events will be presented.