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The La-139(n,γ) cross section: Key for the onset of the s-process

AuthorsTerlizzi, R.; Abbondanno, U.; Aerts, G.; Álvarez, H.; Álvarez-Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Badurek, G.; O'Brien, S.; Durán, I.; Cortés Rossell, Guillem; Cano Ott, Daniel; Capote, R.; Albornoz, A. C. de; Cennini, P.; Chepel, V.; Chiaveri, E.; Couture, A.; Cox, J.; Kappeler, F.; Dahlfors, M.; Eleftheriadis, C.; David, S.; Dillmann, I.; Dolfini, R.; Domingo Pardo, César ; Dridi, W.; Guerrero, C.; Embid-Segura, M.; Ferrant, L.; Gunsing, F.; Ferrari, A.; Ferreira-Marques, R.; Fitzpatrick, L.; Frais-Koelbl, H.; Fujii, K.; Furman, W.; Gallino, R.; Goncalves, I.; González-Romero, E.; Goverdovski, A.; Gramegna, F.; Griesmayer, E.; Haas, B.; Haight, R.; Marrone, S.; Heil, M.; Karamanis, D.; Herrera-Martínez, A.; Igashira, M.; Isaev, S.; Jericha, E.; Kadi, Y.; Marques, L.; Karadimos, D.; Kerveno, M.; Leeb, H.; Ketlerov, V.; Koehler, P.; Konovalov, V.; Kossionides, E.; Krticka, M.; Lamboudis, C.; Lindote, A.; Lopes, I.; Lozano, M.; Lukic, S.; Marganiec, J.; Massimi, C.; Mastinu, P.; Reifarth, R.; Mengoni, A.; Pancin, J.; Milazzo, P. M.; Moreau, C.; Mosconi, M.; Neves, F.; Oberhummer, H.; Rauscher, T.; Papachristodoulou, C.; Papadopoulos, C.; Plag, R.; Paradela, C.; Patronis, N.; Pavlik, A.; Pavlopoulos, P.; Perrot, L.; Pignatari, M.; Tagliente, G.; Plompen, A.; Plukis, A.; Poch, A.; Pretel, C.; Quesada, J.; Rosetti, M.; Rubbia, C.; Rudolf, G.; Becvar, F.; Taín, José Luis ; Rullhusen, P.; Salgado, J.; Sarchiapone, L.; Savvidis, I.; Stephan, C.; Baumann, P.; Tassan-Got, L.; Tavora, L.; Vannini, G.; Vlastou, R.; Vaz, P.; Ventura, A.; Villamarin, D.; Vincente, M. C.; Vlachoudis, V.; Colonna, N.; n_TOF Collaboration; Voss, F.; Walter, S.; Wendler, H.; Wiescher, M.; Wisshak, K.; Berthoumieux, E.; Calviani, M.; Calvino, F.
KeywordsMetal-poor stars
Neutron-capture elements
Giant Branch Stars
Galactic chemical evolution
R-process elements
Cool Dwarf Stars
Resonance spectroscopy
Dispersion spectrograph
Process mucleosynthesis
[PACS] Nucleon radiative capture
[PACS] Hydrostatic stellar nucleosynthesis
[PACS] Properties of nuclei with 90 ≤ A ≤ 149
[PACS] Stellar structure, interiors, evolution, nucleosynthesis, ages
Issue DateMar-2007
PublisherAmerican Physical Society
CitationPhysical Review C 75: 035807 (2007)
AbstractThe nuclear resonance parameters and the capture cross section of the neutron magic isotope La-139 have been measured relative to Au-197 in the energy range of 0.6 eV to 9 keV at the neutron time-of-flight (n_TOF) facility at 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 RI = 10.8 ± 1.0b, the average γ widths for s and p waves <Γ(γ)>(l=0) = 50.7 ± 5.4 meV and <Γ(γ)>(l=1) = 33.6 ± 6.9 meV, the nuclear level densities <D>(l=0) = 252 ± 22 eV and <D>(l=1) < 250 eV, and the neutron strength functions S-0 = (0.82 ± 0.05)x10^(-4) and S-1 = (0.55 ± 0.04)x10(-4). 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.
Description15 pages, 9 figures.-- PACS nrs.: 25.40.Lw; 26.20.+f; 27.60.+j; 97.10.Cv.-- ISI Article Identifier: 000245332200071.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-ex/0610034
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.75.035807
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