Experimental evidence of the effect of nuclear shells on fission dissipation and time
Journal article, 2023
Nuclear fission is still one of the most complex physical processes we can observe in nature due to the interplay of macroscopic and microscopic nuclear properties that decide the result. An example of this coupling is the presence of nuclear dissipation as an important ingredient that contributes to drive the dynamics and has a clear impact on the time of the process. However, different theoretical interpretations, and scarce experimental data make it poorly understood. In this Letter, we present the first experimental determination of the dissipation energy in fission as a function of the fragment split, for three different fissioning systems. The amount of dissipation was obtained through the measurement of the relative production of fragments with even and odd atomic numbers with respect to different initial fission energies. The results reveal a clear effect of particular nuclear shells on the dissipation and fission dynamics. In addition, the relative production of fragments with even and odd atomic numbers appears as a potential contributor to the long-standing problem of the time scale in fission.
Author
D. Ramos
Universidade de Santiagode Compostela
Grand Accélérateur National d'Ions Lourds (GANIL)
M. Caamano
Universidade de Santiagode Compostela
F. Farget
Grand Accélérateur National d'Ions Lourds (GANIL)
C. Rodriguez-Tajes
Grand Accélérateur National d'Ions Lourds (GANIL)
A. Lemasson
Grand Accélérateur National d'Ions Lourds (GANIL)
C. Schmitt
Grand Accélérateur National d'Ions Lourds (GANIL)
Institut Pluridisciplinaire Hubert Curien
L. Audouin
University Paris-Saclay
J. Benlliure
Universidade de Santiagode Compostela
E. Casarejos
University of Vigo
E. Clement
Grand Accélérateur National d'Ions Lourds (GANIL)
D. Cortina
Universidade de Santiagode Compostela
O. Delaune
Grand Accélérateur National d'Ions Lourds (GANIL)
The French Alternative Energies and Atomic Energy Commission (CEA)
X. Derkx
Grand Accélérateur National d'Ions Lourds (GANIL)
A. Dijon
Grand Accélérateur National d'Ions Lourds (GANIL)
D. Dore
Institut de Recherche sur les Lois Fondamentales de l'Univers
B. Fernandez-Dominguez
Universidade de Santiagode Compostela
G. de France
Grand Accélérateur National d'Ions Lourds (GANIL)
Andreas Martin Heinz
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
B. Jacquot
Grand Accélérateur National d'Ions Lourds (GANIL)
C. Paradela
Universidade de Santiagode Compostela
Joint Research Centre (JRC), European Commission
M. Rejmund
Grand Accélérateur National d'Ions Lourds (GANIL)
T. Roger
Grand Accélérateur National d'Ions Lourds (GANIL)
M. D. Salsac
Institut de Recherche sur les Lois Fondamentales de l'Univers
Physical Review C
24699985 (ISSN) 24699993 (eISSN)
Vol. 107 2 L021601Subject Categories
Subatomic Physics
Atom and Molecular Physics and Optics
Other Physics Topics
DOI
10.1103/PhysRevC.107.L021601