Issue |
EPJ Web Conf.
Volume 279, 2023
Nuclear Physics in Astrophysics – X (NPA-X 2022)
|
|
---|---|---|
Article Number | 13001 | |
Number of page(s) | 7 | |
Section | Methods / Facilities | |
DOI | https://doi.org/10.1051/epjconf/202327913001 | |
Published online | 22 March 2023 |
https://doi.org/10.1051/epjconf/202327913001
New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements
1 Instituto de Física Corpuscular, CSIC Universidad de Valencia, Spain
2 Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Spain
3 Universidad de Sevilla, Spain
4 Universitat Politècnica de Catalunya, Spain
5 Institut Laue Langevin (ILL), Grenoble, France
6 Paul Scherrer Institut (PSI), Villigen, Switzerland
7 European Organization for Nuclear Research (CERN), Switzerland
8 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy
9 Department of Physics, University of Pavia, Italy
10 INFN Laboratori Nazionali del Sud, Catania, Italy
11 University of Lodz, Poland
12 University of Manchester, United Kingdom
13 CEA Irfu, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
14 Helmholtz-Zentrum Dresden-Rossendorf, Germany
15 Horia Hulubei National Institute of Physics and Nuclear Engineering, Romania
16 Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia
17 University of Santiago de Compostela, Spain
18 Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Italy
19 Department of Physics, University of Trieste, Italy
20 Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Italy
21 Department of Physics, University of Torino, Italy
22 Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Italy
23 Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Italy
24 Agenzia nazionale per le nuove tecnologie (ENEA), Italy
25 Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Italy
26 Istituto Nazionale di Astrofisica Osservatorio Astronomico di Teramo, Italy
27 Goethe University Frankfurt, Germany
28 Instituto Superior Técnico, Lisbon, Portugal
29 National Technical University of Athens, Greece
30 Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
31 University of Ioannina, Greece
32 Istituto Nazionale di Fisica Nucleare, Sezione di Roma1, Roma, Italy
33 University of Granada, Spain
34 European Commission, Joint Research Centre (JRC), Geel, Belgium
35 University of York, United Kingdom
36 TU Wien, Atominstitut, Stadionallee 2, 1020 Wien, Austria
37 Japan Atomic Energy Agency (JAEA), Tokai-Mura, Japan
38 Charles University, Prague, Czech Republic
39 School of Physics and Astronomy, University of Edinburgh, United Kingdom
40 Dipartimento di Fisica e Astronomia, Università di Bologna, Italy
41 INFN Laboratori Nazionali di Legnaro, Italy
42 Dipartimento Interateneo di Fisica, Università degli Studi di Bari, Italy
43 Consiglio Nazionale delle Ricerche, Bari, Italy
44 Dipartimento di Fisica e Geologia, Università di Perugia, Italy
45 INFN Laboratori Nazionali di Frascati, Italy
46 Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Italy
47 Department of Physics and Astronomy, University of Catania, Italy
48 Uppsala University, Sweden
* e-mail: jorge.lerendegui@ific.uv.es
† deceased
Published online: 22 March 2023
Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant and massive stars. However, neutron capture measurements via the time-of-flight (TOF) technique on key s-process nuclei are often challenging. Difficulties arise from the limited mass (∼mg) available and the high sample-related background in the case of the unstable s-process branching points. Measurements on neutron magic nuclei, that act as s-process bottlenecks, are affected by low (n,γ) cross sections and a dominant neutron scattering background. Overcoming these experimental challenges requires the combination of facilities with high instantaneous flux, such as n_TOFEAR2, with detection systems with an enhanced detection sensitivity and high counting rate capabilities. This contribution reviews some of the latest detector developments in detection systems for (n,γ) measurements at n_TOF, such as i-TED, an innovative detection system which exploits the Compton imaging technique to reduce the dominant neutron scattering background and s-TED, a highly segmented total energy detector intended for high flux facilities. The discussion will be illustrated with results of the first measurement of key the s-process branching-point reaction 79Se(n,γ).
© The Authors, published by EDP Sciences, 2023
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