Eur. Phys. J. A (2005) 25: 455-466
https://doi.org/10.1140/epja/i2005-10138-7

Original Article

S-factor of ¹⁴N(p,γ)¹⁵O at astrophysical energies^⋆

¹ Dipartimento di Fisica and INFN, Università di Napoli “Federico II”, Napoli, Italy
² Dipartimento di Fisica and INFN, Università di Genova, Genova, Italy
³ Laboratori Nazionali del Gran Sasso dell'INFN, Assergi, Italy
⁴ Dipartimento di Fisica and INFN, Università di Padova, Legnaro, Italy
⁵ Centre de Recherches du Cyclotron, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
⁶ INFN, Padova, Italy
⁷ Dipartimento di Fisica and INFN, Università di Milano, Milano, Italy
⁸ Centro de Fısica Nuclear da Universidade de Lisboa, Lisboa, Portugal
⁹ Physique Nucléaire Théorique et Physique Mathématique, Université Libre de Bruxelles, CP 229, Brussels, Belgium
¹⁰ Atomki, Debrecen, Hungary
¹¹ Dipartimento di Fisica Sperimentale and INFN, Università di Torino, Torino, Italy
¹² Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum, Bochum, Germany
¹³ Osservatorio Astronomico Collurania, Teramo, Italy
¹⁴ INFN, Napoli, Italy
¹⁵ Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy

^* e-mail: gianluca.imbriani@na.infn.it

Received: 17 June 2005
Accepted: 16 August 2005
Published online: 12 October 2005

Abstract

The astrophysical S(E) factor of ¹⁴N(p,γ)¹⁵O has been measured for effective center-of-mass energies between E _eff = 119 and 367 keV at the LUNA facility using TiN solid targets and Ge detectors. The data are in good agreement with previous and recent work at overlapping energies. R-matrix analysis reveals that due to the complex level structure of ¹⁵O the extrapolated S(0) value is model dependent and calls for additional experimental efforts to reduce the present uncertainty in S(0) to a level of a few percent as required by astrophysical calculations.