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 092503

Subject Categories

Accelerator Physics and Instrumentation

Subatomic Physics

Atom and Molecular Physics and Optics

DOI

10.1103/PhysRevLett.123.092503

PubMed

31524478

More information

Latest update

10/24/2019