WILSON, J.N.; LEBOIS, M.; QI, L.; AMADOR-CELDRAN, P.; BLEUEL, D.; BRIZ, J.A.; CARROLL, R.; CATFORD, W.; WITTE, H.De; DOHERTY, D.T.; ELOIRDI, R.; GEORGIEV, G.; GOTTARDO, A.; GOASDUFF, A.; HADYÑSKA-KLEK, K.; HAUSCHILD, K.; HESS, H.; 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, S.; PANEBIANCO, S.; PODOLYAK, Zs.; PORTA, Amanda; 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.

doi:10.1051/epjconf/201816900030

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WILSON, J.N.
Institut de Physique Nucléaire d'Orsay [IPNO]

LEBOIS, M.
Institut de Physique Nucléaire d'Orsay [IPNO]

QI, L.
Institut de Physique Nucléaire d'Orsay [IPNO]

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EPJ Web Conf., EPJ Web Conf., 2017-06-20, Varna. 2018, vol. 169, p. 00030

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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.< Réduire

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Studies of fission fragment yields via high-resolution $\gamma$-ray spectroscopy

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