Neutron physics of the Re/Os clock. I. Measurement of the ( n , γ ) cross sections of Os 186 , 187 , 188 at the CERN n_TOF facility
Year: 2010
Type: article
Abstract: The precise determination of the neutron capture cross sections of $^{186}\mathrm{Os}$ and $^{187}\mathrm{Os}$ is important to define the $s$-process abundance of $^{187}\mathrm{Os}$ at the formation of the solar system. This quantity can be used to evaluate the radiogenic component of the abundance of $^{187}\mathrm{Os}$ due to the decay of the unstable $^{187}\mathrm{Re}$ (${t}_{1/2}=41.2$ Gyr) and from this to infer the time duration of the nucleosynthesis in our galaxy (Re/Os cosmochronometer). The neutron capture cross sections of $^{186}\mathrm{Os}$, $^{187}\mathrm{Os}$, and $^{188}\mathrm{Os}$ have been measured at the CERN n_TOF facility from 1 eV to 1 MeV, covering the entire energy range of astrophysical interest. The measurement has been performed by time-of-flight technique using isotopically enriched samples and two ${\mathrm{C}}_{6}$D${}_{6}$ scintillation detectors for recording the prompt $\ensuremath{\gamma}$ rays emitted in the capture events. Maxwellian averaged capture cross sections have been determined for thermal energies between $\mathit{kT}=5$ and 100 keV corresponding to all possible $s$-process scenarios. The estimated uncertainties for the values at 30 keV are 4.1, 3.3, and $4.7%$ for $^{186}\mathrm{Os}$, $^{187}\mathrm{Os}$, and $^{188}\mathrm{Os}$, respectively.
Source: Physical Review C
Authors: M. Mosconi, K. Fujii, A. Mengoni, C. Domingo-Pardo, F. Käppeler, U. Abbondanno, G. Aerts, H. Álvarez-Pol, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, L. Audouin, G. Badurek, P. Baumann, F. Bečvář, F. Belloni, E. Berthoumieux, S. Bisterzo, M. Calviani, F. Calviño, D. Cano-Ott, R. Capote, A. Carrillo de Albornoz, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillmann, R. Dolfini, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marques, L. Fitzpatrick, H. Frais-Koelbl, W. Furman, R. Gallino, I. Goncalves, E. Gonzalez-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, B. Haas, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, S. Isaev, E. Jericha, Y. Kadi, D. Karamanis, D. Karadimos, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionides, M. Krtička, C. Lamboudis, H. Leeb, A. Lindote, I. Lopes, M. Lozano, S. Lukic, J. Marganiec, L. Marques, S. Marrone, C. Massimi, P. Mastinu, P. M. Milazzo, C. Moreau, F. Neves, H. Oberhummer, M. Oshima, S. O’Brien, J. Pancin, C. Papachristodoulou, C. Papadopoulos, C. Paradela, N. Patronis, A. Pavlik, P. Pavlopoulos, L. Perrot, R. Plag, A. Plompen, A. Plukis, A. Poch, J. Praena, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, M. Rosetti, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, L. Sarchiapone, I. Savvidis, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan-Got, L. Tavora, R. Terlizzi, G. Vannini, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudis, R. Vlastou, F. Voss, S. Walter, H. Wendler, M. Wiescher, K. Wisshak
Institutions: Karlsruhe Institute of Technology, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, International Atomic Energy Agency, European Organization for Nuclear Research, Universitat de València, Instituto de Física Corpuscular, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Paris-Saclay, Universidade de Santiago de Compostela, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, University of Łódź, University of Ioannina, TU Wien, Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Charles University, University of Turin, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Universitat Politècnica de Catalunya, Universidad de Sevilla, University of Coimbra, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, University of Notre Dame, University of Pavia, Aristotle University of Thessaloniki, Joint Institute for Nuclear Research, Institute for Physics and Power Engineering, Laboratoire de Physique des deux infinis Bordeaux, Los Alamos National Laboratory, Tokyo Institute of Technology, Oak Ridge National Laboratory, National Centre of Scientific Research "Demokritos", Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, University of Bologna, Japan Atomic Energy Agency, National Technical University of Athens, University of Vienna, Pôle Léonard de Vinci, Joint Research Center, University of Basel, National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Bologna Research Centre
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funder: High Energy Physics
OpenAlex ID: W1845799554