Constraining the level density using fission of lead projectiles
Journal article, 2015
The nuclear level density is one of the main ingredients for the statistical description of the fission process. In this work, we propose to constrain the description of this parameter by using fission reactions induced by protons and light ions on Pb208 at high kinetic energies. The experiment was performed at GSI (Darmstadt), where the combined use of the inverse kinematics technique with an efficient detection setup allowed us to measure the atomic number of the two fission fragments in coincidence. This measurement permitted us to obtain with high precision the partial fission cross sections and the width of the charge distribution as a function of the atomic number of the fissioning system. These data and others previously measured, covering a large range in fissility, are compared to state-of-the-art calculations. The results reveal that total and partial fission cross sections cannot unambiguously constrain the level density at ground-state and saddle-point deformations and additional observables, such as the width of the charge distribution of the final fission fragments, are required.
Author
J. L. Rodriguez-Sanchez
University of Santiago de Compostela (USC)
J. Benlliure
University of Santiago de Compostela (USC)
H. Alvarez-Pol
University of Santiago de Compostela (USC)
L. Audouin
Orsay Nuclear Physics Institute (IPN)
Y. Ayyad
Michigan State University
University of Santiago de Compostela (USC)
G. Belier
The French Alternative Energies and Atomic Energy Commission (CEA)
G. Boutoux
The French Alternative Energies and Atomic Energy Commission (CEA)
University of Bordeaux
E. Casarejos
University of Vigo
A. Chatillon
The French Alternative Energies and Atomic Energy Commission (CEA)
D. Cortina-Gil
University of Santiago de Compostela (USC)
T. Gorbinet
The French Alternative Energies and Atomic Energy Commission (CEA)
Andreas Martin Heinz
Chalmers, Fundamental Physics
A. Kelic-Heil
Helmholtz Association of German Research Centres
B. Laurent
The French Alternative Energies and Atomic Energy Commission (CEA)
J. F. Martin
The French Alternative Energies and Atomic Energy Commission (CEA)
C. Paradela
European Commission (EC)
University of Santiago de Compostela (USC)
E. Pellereau
The French Alternative Energies and Atomic Energy Commission (CEA)
B. Pietras
University of Santiago de Compostela (USC)
D. Ramos
University of Santiago de Compostela (USC)
C. Rodriguez-Tajes
Large Heavy Ion National Accelerator (GANIL)
University of Santiago de Compostela (USC)
D. M. Rossi
Helmholtz Association of German Research Centres
H. Simon
Helmholtz Association of German Research Centres
J. Taieb
The French Alternative Energies and Atomic Energy Commission (CEA)
J. Vargas
University of Santiago de Compostela (USC)
B. Voss
Helmholtz Association of German Research Centres
Physical Review C - Nuclear Physics
05562813 (ISSN) 1089490x (eISSN)
Vol. 92 4 044612Subject Categories (SSIF 2011)
Subatomic Physics
DOI
10.1103/PhysRevC.92.044612