Isotopic fission yields of 240Pu as a function of the excitation energy
Journal article, 2026
Complete isotopic fission yields distributions of 240Pu have been measured as a function of the initial excitation energy. The 240Pu fissioning system was produced through a two-proton transfer reaction between a 238U beam and a 12C 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 targetlike recoil 10Be 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.
Author
D. Ramos
Centre national de la recherche scientifique (CNRS)
M. Caamano
University of Santiago de Compostela (USC)
F. Farget
Centre national de la recherche scientifique (CNRS)
C. Rodriguez-Tajes
Centre national de la recherche scientifique (CNRS)
A. Lemasson
Centre national de la recherche scientifique (CNRS)
M. Rejmund
Centre national de la recherche scientifique (CNRS)
C. Schmitt
University of Strasbourg
E. Clement
Centre national de la recherche scientifique (CNRS)
L. Audouin
University Paris-Saclay
J. Benlliure
University of Santiago de Compostela (USC)
Universitat de Valencia
E. Casarejos
University of Vigo
D. Cortina
University of Santiago de Compostela (USC)
D. Dore
University Paris-Saclay
B. Fernandez-Dominguez
University of Santiago de Compostela (USC)
G. de France
Centre national de la recherche scientifique (CNRS)
Andreas Heinz
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
B. Jacquot
Centre national de la recherche scientifique (CNRS)
C. Paradela
Inst Reference Mat & Measurements
University of Santiago de Compostela (USC)
T. Roger
Centre national de la recherche scientifique (CNRS)
PHYSICAL REVIEW C
2469-9985 (ISSN) 2469-9993 (eISSN)
Vol. 113 5 054611Subject Categories (SSIF 2025)
Subatomic Physics
DOI
10.1103/tjxn-16mq