Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications

Author(s)

Cristian Massimi, Paul Edward Koehler, Sara Bisterzo, N Colonna, Roberto Gallino, Frank Gunsing, Franz Käppeler, G Lorusso, Alberto Mengoni, M Pignatari, Gianni Vannini, Ugo Abbondanno, G Aerts, H Alvarez, Francisco Alvarez-Velarde, Samuel Andriamonje, J Andrzejewski, P Assimakopoulos, Ludmila Audouin, Gerald Badurek, Massimo Barbagallo, P Baumann, Frantisek Becvar, Fabio Belloni, M. Bennett, Eric Berthoumieux, M Calviani, Francisco Calvino, Daniel Cano Ott, R Capote, C. Carrapico, Vitaly Y. Chepell, E Chiaveri, Guillem Cortes, Aaron Couture, J Cox, Marcus Dahlfors, S David, I Dillmann, Rinaldo Dolfini, César Domingo-Pardo, W Dridi, I Duran, C Eleftheriadis, M Embid-Segura, L Ferrant, Arnaud Ferrari, Rebelo Ferreira Marques, L Fitzpatrick, H Frais-Koelbl, K Fujii, Walter I. Furman, Isabel Maria Ferro Goncalves, E Gonzalez-Romero, A Goverdovski, F Gramegna, Erich Griesmayer, Carlos Guerrero, B Haas, Robert C Haight, Michael Heil, Adonai Herrera-Martinez, Falk Herwig, Raphael Hirschi, M Igashira, S Isaev, E Jericha, Yacine Kadi, Dimitrios Karadimos, D Karamanis, M Kerveno, V Ketlerov, V Konovalov, M Krticka, Christos Lampoudis, Helmut Leeb, Claudia Lederer, Alexandre Lindote, I Lopes, Roberto Losito, M Lozano, S Lukic, J Marganiec, L Marques, S Marrone, Trinitario Martinez, P F Mastinu, Emilio Mendoza, P M Milazzo, C Moreau, Marita Mosconi, F Neves, Heinz Oberhummer, S O'Brien, M Oshima, J Pancin, C Papachristodoulou, C Papadopoulos, Carlos Paradela, Nikolaos Patronis, Andreas Pavlik, Panagiotis Pavlopoulos, L Perrot, M T Pigni, Ralf Plag, A J M Plompen, A Plukis, Agusti Poch, Javier Praena, Carmen Pretel Sanchez, Jose Manuel Quesada Molina, Thomas Rauscher, Rene Reifarth, Gabriel Rockefeller, M Rosetti, Carlo Rubbia, Gérard Rudolf, José F. Salgado, Conceicao Santos, Lucia Sarchiapone, Raúl Sarmento, Ilias Savvidis, C Stephan, Giuseppe Tagliente, Jose Luis Tain, Diego Tarrio, Laurent Tassan-Got, Luís M N Tavora, R Terlizzi, Pedro Vaz, A Ventura, D Villamarin - Fernandez, Vassilis Vlachoudis, R Vlastou, Friedrich Voss, S Walter, Helmut Wendler, Michael Wiescher, Klaus Wisshak

Abstract

We have measured the neutron capture cross sections of the stable magnesium isotopes Mg-24,Mg-25,Mg-26 in the energy range of interest to the s process using the neutron time-of-flight facility n_TOF at CERN. Capture events from a natural metal sample and from samples enriched in Mg-25 and Mg-26 were recorded using the total energy method based on (C6H6)-H-2 detectors. Neutron resonance parameters were extracted by a simultaneous resonance shape analysis of the present capture data and existing transmission data on a natural isotopic sample. Maxwellian-averaged capture cross sections for the three isotopes were calculated up to thermal energies of 100 keV and their impact on s-process analyses was investigated. At 30 keV the new values of the stellar cross section for Mg-24, Mg-25, and Mg-26 are 3.8 +/- 0.2 mb, 4.1 +/- 0.6 mb, and 0.14 +/- 0.01 mb, respectively.

Organisation(s)

Isotope Physics

External organisation(s)

Istituto Nazionale di Fisica Nucleare (INFN), Roma, Oak Ridge National Laboratory , University of Turin, French Alternative Energies and Atomic Energy Commission (CEA), Karlsruher Institut für Technologie, International Atomic Energy Agency (IAEA), Universität Basel, Universidade de Santiago de Compostela (USC), Centro de Investigaciones Energeticas Medioambientales y Tecnológica, University of Lodz, University of Ioannina, Institut de Physique Nucléaire d'Orsay (IPN), Technische Universität Wien, Centre National de la Recherche Scientifique (CNRS), Strasbourg , Charles University Prague, Keele University, European Organization for Nuclear Research (CERN), Universidad Politécnica de Madrid, Universidade de Coimbra, Universitat Politècnica de Catalunya, University of Notre Dame, Centre de Specrométrie Nucleaire et de Spectrométrie de Masse (CSNSM), Università degli studi di Pavia, Universitat de València, Aristotle University of Thessaloniki, Joint Institute for Nuclear Research, Nuclear and Technological Institute (ITN), Institute of Physics and Power Engineering (IPPE), Centre National De La Recherche Scientifique (CNRS), Los Alamos National Laboratory, GSI Helmholtzzentrum für Schwerionenforschung, University of Victoria, Tokyo Institute of Technology (TIT), Universidad de Sevilla, Japan Atomic Energy Research Institute, National Technical University of Athens (NTUA), Pôle universitaire Léonard-de-Vinci, Commiss European Communities, Joint Res Ctr, Inst Reference Mat & Measurements, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Instituto Superior Técnico

Journal

Physical Review C

Volume

85

No. of pages

15

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.85.044615

Publication date

2012

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics, 103005 Atomic physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/0034bf4a-4e1d-47ec-a009-1b6865453a58