EPJ Web Conf.
Volume 169, 2018Scientific Workshop on “Nuclear Fission Dynamics and the Emission of Prompt Neutrons and Gamma Rays“ (Theory-4)
|Number of page(s)||8|
|Published online||06 March 2018|
Studies of fission fragment yields via high-resolution γ-ray spectroscopy
Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
2 European Commission, Joint Research Centre, Directorate G for Nuclear Safety and Security, Unit G.I.5, Postfach 2340, 76215 Karlsruhe, Germany
3 Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA 94550, USA
4 Subatech/Ecole des Mines, 4 rue Alfred Kastler, 44307 Nantes, France
5 Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
6 Institute for Nuclear and Radiation Physics, KU Leuven, 3000 Leuven, Belgium
7 Irfu, CEA, Université Paris Saclay, 91191 Gif-sur-Yvette Cedex, France
8 CSNSM Orsay, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
9 INFN Laboratori Nazionali di Legnaro, Viale dell'Universita, 2, 35020 Legnaro, Italy
10 Institut für Kernphysik, Zülpicher Strasse 77, 50937 Köln, Germany
11 University of Oslo, Department of Physics, P.O. Box 1048, Blindern 0316 Oslo, Norway
12 National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK
13 LMU München, Schellingstrasse 4, 80799, Munich, Germany
14 CEA/DAM, DIF, Bruyères-le-chètel, 91297 Arpajon, France
15 CENBG Bordeaux, Chemin du Solarium, Le Haut Vigneau, BP. 120, 33175 Gradignan, France
16 Extreme Light Infrastructure - Nuclear Physics (ELI-NP), 077125 Bucharest-Magurele, Romania
17 European Commission, Joint Research Centre, Directorate G for Nuclear Safety and Security, Unit G.2, 2440 Geel, Belgium
18 CEA Cadarache, 13108 Saint-Paul-lez-Durance, France
19 University of Manchester, Dept. Of Physics, Oxford Road, Manchester, M13 9PL, UK
Published online: 6 March 2018
Precise spectroscopic information on the fast neutron induced fission of the 238U(n,f) reaction was recently gained using a new technique which involved coupling of the Miniball high resolution y-ray spectrometer and the LICORNE directional neutron source. The experiment allowed measurement of the isotopic fission yields for around 40 even-even nuclei at an incident neutron energy of around 2 MeV where yield data are very sparse. In addition spectroscopic information on very neutron-rich fission products was obtained. Results were compared to models, both the JEFF-3.1.1 data base and the GEF code, and large discrepancies for the S1 fission mode in the Sn/Mo isotope pair were discovered. This suggests that current models are overestimating the role played by spherical shell effects in fast neutron induced fission. In late 2017 and 2018 the nu-ball hybrid spectrometer will be constructed at the IPN Orsay to perform further experimental investigations with directional neutrons coupled to a powerful hybrid Ge/LaBr3 detector array. This will open up new possibilities for measurements of fission yields for fast-neutron-induced fission using the spectroscopic technique and will be complimentary to other methods being developed.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.