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

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Item Type: Pubblicazione in rivista scientifica
Language: English
Title: CNO hydrogen burning studied deep underground
Creators:
CreatorsEmail
Imbriani, GianlucaUNSPECIFIED
Roca, VincenzoUNSPECIFIED
Romano, MarioUNSPECIFIED
Autor/s: 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.
Date: 2006
Number of Pages: 10
Department: Scienze fisiche
Identification Number: 10.1140/epja/i2006-08-024-7
Official URL: 10.1140/epja/i2006-08-024-7
Journal or Publication Title: THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Date: 2006
Page Range: pp. 161-170
Number of Pages: 10
Uncontrolled Keywords: Radiative capture - Hydrostatic stellar nucleosynthesis - Electrostatic, collective, and linear accelerators - X- and γ-ray spectroscopy
Identification Number: 10.1140/epja/i2006-08-024-7
Date Deposited: 20 Oct 2010 08:00
Last Modified: 30 Apr 2014 19:41
URI: http://www.fedoa.unina.it/id/eprint/6212

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.

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