Publikationen

Time-of-flight and activation experiments on 147Pm and 171Tm for astrophysics

Autor(en)
C. Guerrero, J. Lerendegui-Marco, C. Domingo-Pardo, A. Casanovas, R. Dressler, S. Halfon, S. Heinitz, N. Kivel, U. Köster, M. Paul, J. M. Quesada-Molina, D. Schumann, A. Tarifeño-Saldivia, M. Tessler, L. Weissman, O. Aberle, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, M. Barbagallo, F. Becvar, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, R. Cardella, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, L. A. Damone, M. Diakaki, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Ferreira, P. Finocchiaro, K. Göbel, A. R. García, A. Gawlik, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González, E. Griesmayer, F. Gunsing, H. Harada, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, M. Kokkoris, M. Krticka, D. Kurtulgil, E. Leal-Cidoncha, C. Lederer, H. Leeb, S. Lo Meo, S. J. Lonsdale, D. Macina, J. Marganiec, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, I. Porras, J. Praena, D. Radeck, T. Rauscher, R. Reifarth, P. C. Rout, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, L. Tassan-Got, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, P. Žugec
Abstrakt

The neutron capture cross section of several key unstable isotopes acting as branching points in the s-process are crucial for stellar nucleosynthesis studies, but they are very challenging to measure due to the difficult production of sufficient sample material, the high activity of the resulting samples, and the actual (n,γ) measurement, for which high neutron fluxes and effective background rejection capabilities are required. As part of a new program to measure some of these important branching points, radioactive targets of 147Pm and 171Tm have been produced by irradiation of stable isotopes at the ILL high flux reactor. Neutron capture on 146Nd and 170Er at the reactor was followed by beta decay and the resulting matrix was purified via radiochemical separation at PSI. The radioactive targets have been used for time-of-flight measurements at the CERN n-TOF facility using the 19 and 185 m beam lines during 2014 and 2015. The capture cascades were detected using a set of four C6D6 scintillators, allowing to observe the associated neutron capture resonances. The results presented in this work are the first ever determination of the resonance capture cross section of 147Pm and 171Tm. Activation experiments on the same 147Pm and 171Tm targets with a high-intensity 30 keV quasi-Maxwellian flux of neutrons will be performed using the SARAF accelerator and the Liquid-Lithium Target (LiLiT) in order to extract the corresponding Maxwellian Average Cross Section (MACS). The status of these experiments and preliminary results will be presented and discussed as well.

Organisation(en)
Isotopenphysik
Externe Organisation(en)
Universidad de Sevilla, Universitat de València, Universitat Politècnica de Catalunya, Paul Scherrer Institute, Soreq Nuclear Research Center, University of York, Institut Laue-Langevin (ILL), Hebrew University Jerusalem, European Organization for Nuclear Research (CERN), University of Lodz, Université Paris-Saclay, IRFU, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Istituto Nazionale di Fisica Nucleare, Roma, Sezione di Bologna, Charles University Prague, Manchester Metropolitan University, University of Zagreb, Universidade de Santiago de Compostela (USC), Università degli Studi di Bari, Associação EURATOM/IST, Johann Wolfgang Goethe-Universität Frankfurt am Main, Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN HH), Technische Universität Wien, Japan Atomic Energy Agency, European Commission, Joint Research Centre, Karlsruher Institut für Technologie, National Technical University of Athens (NTUA), University of Edinburgh, ENEA Centro Ricerche Bologna, Consiglio Nazionale delle Ricerche (CNR), Padua, Università degli Studi di Catania, Physikalisch-Technische Bundesanstalt (PTB), University of Ioannina, Universidad de Granada, Universität Basel, Centre for Astrophysics Research, University of Hertfordshire, Bhabha Atomic Research Centre, Università degli Studi di Bologna, Australian National University
Anzahl der Seiten
4
DOI
https://doi.org/10.1051/epjconf/201714601007
Publikationsdatum
09-2017
Peer-reviewed
Ja
ÖFOS 2012
103014 Kernphysik
ASJC Scopus Sachgebiete
Physics and Astronomy(all)
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/timeofflight-and-activation-experiments-on-147pm-and-171tm-for-astrophysics(535e910c-3384-4231-ab83-8f9de40cd10c).html