139-La(n,gamma) Cross Section: Key for the Onset of the s-Process

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dc.contributor.author Rosetti, M.
dc.contributor.author Ventura, A.
dc.date.accessioned 2012-06-25T09:49:34Z
dc.date.available 2012-06-25T09:49:34Z
dc.date.issued 2007-03-01
dc.identifier.uri http://hdl.handle.net/10840/2470
dc.description.abstract The nuclear resonance parameters and the capture cross section of the neutron magic isotope 139La have been measured relative to 197Au in the energy range of 0.6 eV to 9 keV at the neutron time-of-flight (n_TOF) facility al CERN. We describe the experimental apparatus and the data analysis procedures, which concerned mainly the efficiency correction by means of the pulse height weighting function technique and the determination of different background components. We extracted the resonance parameters and the main nuclear quantities such as the resonance integral, the average gamma widths for s and p waves, the 1=0 and 1=1 resonance spacing and the neutron strength functions S0 and S1. These results represent a significant improvement over previous data. The deduced Maxwellian-averaged capture cross sections are important for the interpretation of the most recent spectroscopic observations in low-metallicity stars. it_IT
dc.language.iso en it_IT
dc.title 139-La(n,gamma) Cross Section: Key for the Onset of the s-Process it_IT
dc.type Articolo su rivista it_IT
dc.description.sede-enea Centro Ricerche Bologna it_IT
dc.subject.keywords Applicazioni di fisica e tecnologie nucleari it_IT
dc.subject.tipologia-enea Metodi per la Sicurezza dei Reattori e Ciclo del Combustibile it_IT
dc.description.info Autori: M. Rosetti (*), A. Ventura (*) et al.; (*) = autori ENEA. - Pubblicato su: Physical Review C, Vol. 75, No. 3, pp. 035807:1-15, March, 2007 it_IT

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