Imbriani, Gianluca, Roca, Vincenzo and Romano, Mario (2006) CNO hydrogen burning studied deep underground. [Pubblicazione in rivista scientifica]
Full text not available from this repository.| Item Type: | Pubblicazione in rivista scientifica |
|---|---|
| Resource language: | English |
| Title: | CNO hydrogen burning studied deep underground |
| Creators: | Creators Email Imbriani, Gianluca UNSPECIFIED Roca, Vincenzo UNSPECIFIED Romano, Mario UNSPECIFIED |
| 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. |
| Date: | 2006 |
| Number of Pages: | 10 |
| Department: | Scienze fisiche |
| Identification Number: | 10.1140/epja/i2006-08-024-7 |
| Original publication 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 |
| 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 |
Collection description
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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