First Direct Measurement of Isotopic Fission-Fragment Yields of 239U
Journal article, 2019
A direct and complete measurement of isotopic fission-fragment yields of U-239 has been performed for the first time. The U-239 fissioning system was produced with an average excitation energy of 8.3 MeV in one-neutron transfer reactions between a U-239 beam and a Be-9 target at Coulomb barrier energies. The fission fragments were detected and isotopically identified using the VAMOS++ spectrometer at the GANIL facility. The measurement allows us to directly evaluate the fission models at excitation energies of fast neutrons, which are 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 U-239, and they confirm the persistence of spherical shell effects in the Sn region at excitation energies exceeding the fission barrier by a few mega-electron volts.
Author
D. Ramos
University Paris-Saclay
The French Alternative Energies and Atomic Energy Commission (CEA)
M. Caamano
Universidade de Santiagode Compostela
A. Lemasson
The French Alternative Energies and Atomic Energy Commission (CEA)
M. Rejmund
The French Alternative Energies and Atomic Energy Commission (CEA)
L. Audouin
University Paris-Saclay
H. Alvarez-Po
Universidade de Santiagode Compostela
J. D. Frankland
The French Alternative Energies and Atomic Energy Commission (CEA)
B. Fernandez-Dominguez
Universidade de Santiagode Compostela
E. Galiana-Baldo
LIP - Lisboa
Universidade de Santiagode Compostela
J. Piot
The French Alternative Energies and Atomic Energy Commission (CEA)
D. Ackermann
The French Alternative Energies and Atomic Energy Commission (CEA)
S. Biswas
The French Alternative Energies and Atomic Energy Commission (CEA)
E. Clement
The French Alternative Energies and Atomic Energy Commission (CEA)
D. Durand
Normandie University
F. Farget
Normandie University
M. O. Fregeau
The French Alternative Energies and Atomic Energy Commission (CEA)
D. Galaviz
LIP - Lisboa
Andreas Martin Heinz
Chalmers, Physics, Subatomic and Plasma Physics
Henriques
University of Bordeaux
B. Jacquot
The French Alternative Energies and Atomic Energy Commission (CEA)
B. Jurado
University of Bordeaux
Y. H. Kim
The French Alternative Energies and Atomic Energy Commission (CEA)
P. Morfouace
The French Alternative Energies and Atomic Energy Commission (CEA)
D. Ralet
University Paris-Saclay
T. Roger
The French Alternative Energies and Atomic Energy Commission (CEA)
C. Schmitt
University of Strasbourg
P. Teubig
LIP - Lisboa
I Tsekhanovich
University of Bordeaux
Physical Review Letters
0031-9007 (ISSN) 1079-7114 (eISSN)
Vol. 123 9 092503Subject Categories
Accelerator Physics and Instrumentation
Subatomic Physics
Atom and Molecular Physics and Optics
DOI
10.1103/PhysRevLett.123.092503
PubMed
31524478