Studies of fission fragment yields via high-resolution gamma-ray spectroscopy
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.
WILSON J. N.;
LEBOIS M.;
QI Liqiang;
AMADOR CELDRAN Pedro;
BLEUEL D. L.;
BRIZ J. A.;
CARROLL R.;
CATFORD W.;
DE WITTE H.;
DOHERTY D.;
ELOIRDI Rachel;
GEORGIEV 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 Stephan;
PANEBIANCO 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.;
2018-09-12
EDP Sciences
JRC109170
2100 014X,
https://publications.jrc.ec.europa.eu/repository/handle/JRC109170,
10.1051/epjconf/201816900030,
Additional supporting files
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