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Isotopic fission yields of ${}^{240}$Pu as a function of the excitation energy

Fuente: arXiv
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Detalles Bibliográficos
Autores principales: Ramos, D., Caamaño, M., Farget, F., Rodríguez-Tajes, C., Lemasson, A., Rejmund, M., Schmitt, C., Clement, E., Audouin, L., Benlliure, J., Casarejos, E., Cortina, D., Doré, D., Fernández-Domínguez, B., de France, G., Heinz, A., Jacquot, B., Paradela, C., Roger, T.
Formato: Preprint
Publicado: 2026
Materias:
Nuclear Experiment
Acceso en línea:
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author Ramos, D.
Caamaño, M.
Farget, F.
Rodríguez-Tajes, C.
Lemasson, A.
Rejmund, M.
Schmitt, C.
Clement, E.
Audouin, L.
Benlliure, J.
Casarejos, E.
Cortina, D.
Doré, D.
Fernández-Domínguez, B.
de France, G.
Heinz, A.
Jacquot, B.
Paradela, C.
Roger, T.
author_facet Ramos, D.
Caamaño, M.
Farget, F.
Rodríguez-Tajes, C.
Lemasson, A.
Rejmund, M.
Schmitt, C.
Clement, E.
Audouin, L.
Benlliure, J.
Casarejos, E.
Cortina, D.
Doré, D.
Fernández-Domínguez, B.
de France, G.
Heinz, A.
Jacquot, B.
Paradela, C.
Roger, T.
contents Complete isotopic fission yields distributions of $^{240}$Pu have been measured as a function of the initial excitation energy. The $^{240}$Pu fissioning system was produced through a two-proton transfer reaction between a $^{238}$U beam and a $^{12}$C target. The reaction was measured in inverse kinematics at Coulomb barrier energies, allowing for the full distribution of fission fragments to be isotopically identified with the VAMOS++ Spectrometer. The excitation energy of the system was measured on an event-by-event basis by detecting the target-like recoil $^{10}$Be in a segmented silicon telescope. This manuscript reports on the evolution of the fission yields as a function of the excitation energy of the system between 8.2 to 11.9 MeV. The influence of the excitation energy is manifested in the damping of shell effects that feed the yields in the symmetry valley, as well as in a reduction of the neutron content of the fragments. This reduction, however, is observed only in the heavy fragment, while the neutron content of the light fragment remains unaffected. The comparison with previous measurements, models, and evaluations highlights the importance of correlated observables for improving fission models.
format Preprint
id arxiv_https___arxiv_org_abs_2605_27234
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Isotopic fission yields of ${}^{240}$Pu as a function of the excitation energy
Ramos, D.
Caamaño, M.
Farget, F.
Rodríguez-Tajes, C.
Lemasson, A.
Rejmund, M.
Schmitt, C.
Clement, E.
Audouin, L.
Benlliure, J.
Casarejos, E.
Cortina, D.
Doré, D.
Fernández-Domínguez, B.
de France, G.
Heinz, A.
Jacquot, B.
Paradela, C.
Roger, T.
Nuclear Experiment
Complete isotopic fission yields distributions of $^{240}$Pu have been measured as a function of the initial excitation energy. The $^{240}$Pu fissioning system was produced through a two-proton transfer reaction between a $^{238}$U beam and a $^{12}$C target. The reaction was measured in inverse kinematics at Coulomb barrier energies, allowing for the full distribution of fission fragments to be isotopically identified with the VAMOS++ Spectrometer. The excitation energy of the system was measured on an event-by-event basis by detecting the target-like recoil $^{10}$Be in a segmented silicon telescope. This manuscript reports on the evolution of the fission yields as a function of the excitation energy of the system between 8.2 to 11.9 MeV. The influence of the excitation energy is manifested in the damping of shell effects that feed the yields in the symmetry valley, as well as in a reduction of the neutron content of the fragments. This reduction, however, is observed only in the heavy fragment, while the neutron content of the light fragment remains unaffected. The comparison with previous measurements, models, and evaluations highlights the importance of correlated observables for improving fission models.
title Isotopic fission yields of ${}^{240}$Pu as a function of the excitation energy
topic Nuclear Experiment
url https://arxiv.org/abs/2605.27234

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