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First direct measurement of isotopic fission-fragment yields of $^{239}$U by Ramos, D.; Caamano, M.; Lemasson, A.; Rejmund, M.; Audouin, L.; Alvarez-Pol, H.; Frankland, J. D.; Fernandez-Dominguez, B.; Galiana-Baldo, E.; Piot, J.; Ackermann, D.; Biswas, S.; Clement, E.; Durand, D.; Farget, F.; Fregeau, M. O.; Galaviz, D.; Heinz, A.; Henriques, A. I.; Jacquot, B.; Jurado, B.; Kim, Y. H.; Morfouace, P.; Ralet, D.; Roger, T.; Schmitt, C.; Teubig, P.; Tsekhanovich, I. is a scholarly article available to read on EtoBox.

What is First direct measurement of isotopic fission-fragment yields of $^{239}$U about?

A direct and complete measurement of isotopic fission-fragment yields of $^{239}$U has been performed for the first time. The $^{239}$U fissioning system was produced with an average excitation energy of 8.3 MeV in one-neutron transfer reactions between a $^{238}$U beam and a $^{9}$Be target at Coulomb barrier energies. The fission fragments were detected and isotopically identified using the VAMOS++ spectrometer at the GANIL facility. This measurement allows to directly evaluate the fission models at excitation energies of fast neutrons, relevant for next-generation nuclear reactors. The present data, in agreement with model calculations, do not support the recently reported anomaly in the fission-fragment yields of $^{239}$U and confirm the persistence of spherical shell effects in the Sn region at excitation energies exceeding the fission barrier by few MeV.

Author

Ramos, D.; Caamano, M.; Lemasson, A.; Rejmund, M.; Audouin, L.; Alvarez-Pol, H.; Frankland, J. D.; Fernandez-Dominguez, B.; Galiana-Baldo, E.; Piot, J.; Ackermann, D.; Biswas, S.; Clement, E.; Durand, D.; Farget, F.; Fregeau, M. O.; Galaviz, D.; Heinz, A.; Henriques, A. I.; Jacquot, B.; Jurado, B.; Kim, Y. H.; Morfouace, P.; Ralet, D.; Roger, T.; Schmitt, C.; Teubig, P.; Tsekhanovich, I.

Published

2019

Language

EN