In stars, four hydrogen nuclei are converted into a helium nucleus in two competing nuclear fusion processes, namely the proton-proton chain (p-p chain)and the carbon-nitrogen-oxygen (CNO) cycle. For temperatures above 20 million kelvin, the CNO cycle dominates energy production, and its rate is determined by the slowest process, the 14N(p, γ)15O radiative capture reaction. This reaction proceeds through direct and resonant capture into the ground state and several excited states in 15O. High energy data for capture into each of these states can be extrapolated to stellar energies using an R-matrix fit. The results from several recent extrapolation studies are discussed. A new experiment at the LUNA (Laboratory for Underground Nuclear Astrophysics)400 kV accelerator in Italy’s Gran Sasso laboratory measures the total cross section of the 14N(p, γ)15O reaction with a windowless gas target and a 4π BGO summing detector, down to center of mass energies as low as 70 keV. After reviewing the characteristics of the LUNA facility, the main features of this experiment are discussed, as well as astrophysical scenarios where cross section data in the energy range covered have a direct impact, without any extrapolation.
CNO hydrogen burning studied deep undergroundThe 2nd International Conference on Nuclear Physics in Astrophysics / D., Bemmerer; F., Confortola; A., Lemut; R., Bonetti; C., Broggini; P., Corvisiero; H., Costantini; J., Cruz; A., Formicola; Fülöp, Z. s.; G., Gervino; A., Guglielmetti; C., Gustavino; Gyürky, G. y.; Imbriani, Gianluca; A. P., Jesus; M., Junker; Limata, BENEDICTA NORMANNA; R., Menegazzo; P., Prati; Roca, Vincenzo; D., Rogalla; C., Rolfs; Romano, Mario; C., Rossi Alvarez; F., Schümann; E., Somorjai; O., Straniero; F., Strieder; F., Terrasi; H. P., Trautvetter. - (2006). (Intervento presentato al convegno The 2nd International Conference on Nuclear Physics in Astrophysics tenutosi a Debrechen nel 25-30 June 2006).
CNO hydrogen burning studied deep undergroundThe 2nd International Conference on Nuclear Physics in Astrophysics
IMBRIANI, GIANLUCA;LIMATA, BENEDICTA NORMANNA;ROCA, VINCENZO;ROMANO, MARIO;
2006
Abstract
In stars, four hydrogen nuclei are converted into a helium nucleus in two competing nuclear fusion processes, namely the proton-proton chain (p-p chain)and the carbon-nitrogen-oxygen (CNO) cycle. For temperatures above 20 million kelvin, the CNO cycle dominates energy production, and its rate is determined by the slowest process, the 14N(p, γ)15O radiative capture reaction. This reaction proceeds through direct and resonant capture into the ground state and several excited states in 15O. High energy data for capture into each of these states can be extrapolated to stellar energies using an R-matrix fit. The results from several recent extrapolation studies are discussed. A new experiment at the LUNA (Laboratory for Underground Nuclear Astrophysics)400 kV accelerator in Italy’s Gran Sasso laboratory measures the total cross section of the 14N(p, γ)15O reaction with a windowless gas target and a 4π BGO summing detector, down to center of mass energies as low as 70 keV. After reviewing the characteristics of the LUNA facility, the main features of this experiment are discussed, as well as astrophysical scenarios where cross section data in the energy range covered have a direct impact, without any extrapolation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.