The rate of the hydrogen-burning carbon-nitrogen-oxygen (CNO) cycle is controlled by the slowest process, N-14(p, gamma)O-15, which proceeds by capture to the ground and several excited states in O-15. Previous extrapolations for the ground state contribution disagreed by a factor 2, corresponding to 15% uncertainty in the total astrophysical S factor. At the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator placed deep underground in the Gran Sasso facility in Italy, a new experiment on ground state capture has been carried out at 317.8, 334.4, and 353.3 keV center-of-mass energy. Systematic corrections have been reduced considerably with respect to previous studies by using a Clover detector and by adopting a relative analysis. The previous discrepancy has been resolved, and ground state capture no longer dominates the uncertainty of the total S factor.

Precision study of ground state capture in the 14N(p,γ)15O reaction

GERVINO, Gianpiero;
2008-01-01

Abstract

The rate of the hydrogen-burning carbon-nitrogen-oxygen (CNO) cycle is controlled by the slowest process, N-14(p, gamma)O-15, which proceeds by capture to the ground and several excited states in O-15. Previous extrapolations for the ground state contribution disagreed by a factor 2, corresponding to 15% uncertainty in the total astrophysical S factor. At the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator placed deep underground in the Gran Sasso facility in Italy, a new experiment on ground state capture has been carried out at 317.8, 334.4, and 353.3 keV center-of-mass energy. Systematic corrections have been reduced considerably with respect to previous studies by using a Clover detector and by adopting a relative analysis. The previous discrepancy has been resolved, and ground state capture no longer dominates the uncertainty of the total S factor.
2008
78
2
022802
-
http://oai.aps.org/oai?verb=GetRecord&Identifier=oai:aps.org:PhysRevC.78.022802&metadataPrefix=oai_apsmeta_2
S-FACTOR; SOLAR NEUTRINOS; N-14(P; GAMMA)O-15; ACCELERATOR; SIMULATION; MODELS; O-15
M. Marta; A. Formicola; G. Gyurky; D. Bemmerer; C. Broggini; A. Caciolli; P. Corvisiero; H. Costantini; Z. Elekes; Z. Fulop; G. Gervino; A. Guglielmetti; C. Gustavino; G. Imbriani; M. Junker; R. Kunz; A. Lemut; B. Limata; C. Mazzocchi; R. Menegazzo; P. Prati; V. Roca; C. Rolfs; M. Romano; C. R. Alvarez; E. Somorjai; O. Straniero; F. Strieder; F. Terrasi; H. P. Trautvetter; A. Vomiero
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/49610
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