Imbriani, Gianluca and Roca, Vincenzo and Romano, Mario (2006) CNO hydrogen burning studied deep underground. [Pubblicazione in rivista scientifica]

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Tipologia del documento: Pubblicazione in rivista scientifica
Lingua: English
Titolo: CNO hydrogen burning studied deep underground
Imbriani, Gianluca[non definito]
Roca, Vincenzo[non definito]
Romano, Mario[non definito]
Autore/i: Bemmerer D.; Confortola F.; Lemut A.; Bonetti R.; Broggini C.; Corvisiero P.; Costantini H.; Cruz J.; Formicola A.; Fulop Zs.; Gervino G.; Guglielmetti A.; Gustavino C.; Gyurky Gy.; Imbriani G.; Jesus A.P.; Junker M.; Limata B.; Menegazzo R.; Prati P.; Roca V.; Rogalla D.; Rolfs C.; Romano M.; Rossi Alvarez C.; Schuemann F.; Somorjai E.; Straniero O.; Strieder F.; Terrasi F.; Trautvetter H.P.
Data: 2006
Numero di pagine: 10
Dipartimento: Scienze fisiche
Numero identificativo: 10.1140/epja/i2006-08-024-7
URL ufficiale: 10.1140/epja/i2006-08-024-7
Data: 2006
Intervallo di pagine: pp. 161-170
Numero di pagine: 10
Parole chiave: Radiative capture - Hydrostatic stellar nucleosynthesis - Electrostatic, collective, and linear accelerators - X- and γ-ray spectroscopy
Numero identificativo: 10.1140/epja/i2006-08-024-7
Depositato il: 20 Ott 2010 08:00
Ultima modifica: 30 Apr 2014 19:41


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) 400kV 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 70keV. 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.

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