Title: Studies of fission fragment yields via high-resolution gamma-ray spectroscopy
Authors: WILSON J. N.LEBOIS M.QI LIQIANGAMADOR CELDRAN PEDROBLEUEL D. L.BRIZ J. A.CARROLL R.CATFORD W.DE WITTE H.DOHERTY D.ELOIRDI RACHELGEORGIEV G.GOTTARDO A.GOASDUFF A.HADYNSKE-KLEK K.HAUSCHILD K.HESS M.INGEBERG V.KONSTANTINOPOULOS T.LJUNGVALL J.LOPEZ-MARTENS A.LORUSSO G.LOZEVA R.LUTTER R.MARINI P.MATEA I.MATERNA T.MATHIEU L.OBERSTEDT A.OBERSTEDT STEPHANPANEBIANCO S.PODOLYAK Z.PORTA A.REGAN P. H,REITER P.REZYNKINA K.ROSE S. J.SAHIN E.SEIDLITZ M.SEROT O.SHEARMAN R.SIEBECK B.SIEM S.SMITH A. G.TVETEN G. M.VERNEY D.WARR N.ZEISER F.ZIELINSKA M.
Citation: EPJ Web of Conferences vol. 169 p. 00030
Publisher: EDP Sciences
Publication Year: 2018
JRC N°: JRC109170
ISSN: 2100 014X
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC109170
DOI: 10.1051/epjconf/201816900030
Type: Articles in periodicals and books
Abstract: 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 γ-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.
JRC Directorate:Nuclear Safety and Security

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