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Título : The La-139(n,γ) cross section: Key for the onset of the s-process
Autor : Terlizzi, R., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez-Velarde, H., Álvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Reifarth, R., Plag, R., 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., Duran, I., Cortés, G., Cano Ott, Daniel, Capote, R., Albornoz, A. C. de, Cennini, P., Chepel, V., Chiaveri, E., Couture, A., Cox, J., Dahlfors, M., Eleftheriadis, C., David, S., Dillmann, I., Dolfini, R., Domingo Pardo, César, Dridi, W., Guerrero, C., Embid-Segura, M., Ferrant, L., Ferrari, A., Ferreira-Marques, R., Fitzpatrick, L., Frais-Koelbl, H., Fujii, K., Furman, W., Kappeler, F., Gunsing, F., Gallino, R., Goncalves, I., González-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Haas, B., Haight, R., Heil, M., Karamanis, D., Herrera-Martínez, A., Igashira, M., Isaev, S., Jericha, E., Kadi, Y., Marques, L., Karadimos, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Kossionides, E., Krticka, M., Lamboudis, C., O'Brien, S., Marrone, S., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Massimi, C., Mastinu, P., Mengoni, A., Pancin, J., Milazzo, P. M., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., Rauscher, T., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pignatari, M., Tagliente, G.
Palabras clave : Metal-poor stars
Neutron-capture elements
Giant Branch Stars
Galactic chemical evolution
R-process elements
Cool Dwarf Stars
Resonance spectroscopy
n_TOF
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
Fecha de publicación : Mar-2007
Editor: American Physical Society
Resumen: The 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.
Descripción : 15 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
Versión del editor: http://dx.doi.org/10.1103/PhysRevC.75.035807
URI : http://hdl.handle.net/10261/9173
ISSN: 0556-2813
DOI: 10.1103/PhysRevC.75.035807
Citación : Physical Review C 75: 035807 (2007)
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