CNO hydrogen burning studied deep underground

IMBRIANI, GIANLUCA and ROCA, VINCENZO and ROMANO, MARIO (2006) CNO hydrogen burning studied deep underground. [Pubblicazione su rivista scientifica]

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URL: 10.1140/epja/i2006-08-024-7

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) 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.

Tipologia di documento:Pubblicazione su rivista scientifica
Parole chiave:Radiative capture - Hydrostatic stellar nucleosynthesis - Electrostatic, collective, and linear accelerators - X- and γ-ray spectroscopy
Settori scientifico-disciplinari MIUR:Non specificato
Stato del full text:Accessibilità ristretta
Data:2006
Altri Autori: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.
Numero di pagine:10
Intervallo di pagina:pp. 161-170
URL:10.1140/epja/i2006-08-024-7
Dipartimento o Struttura:Dipartimento di Scienze Fisiche
Numero identificativo:10.1140/epja/i2006-08-024-7
Titolo rivista/pubblicazione:THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Numero di sistema:6212
Depositato il:20 Ottobre 2010 10:00
Ultima modifica:20 Ottobre 2010 10:00

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