Complete characterization of the fission fragments produced in reactions induced by $^{208}$Pb projectiles on proton at 500A MeV
Abstract
The two fragments produced in fission reactions induced by 208Pb projectiles impinging on a liquid hydrogen
target at 500A MeV have been fully identified in coincidence. The experiment was performed at GSI Darmstadt,
where the combined use of the inverse kinematics technique with an efficient detection setup permitted one to
detect and to fully identify the fission fragments in a range from Z = 27 to Z = 52. The corresponding isotopic
cross sections and velocities of the fission fragments weremeasured with high accuracy. The results are compared
to state-of-the-art model calculations that reproduce the measured observables. Correlations between the two
fragments were used to assess the role of charge polarization and the excitation energy gained by the nascent
fragments using the neutron excess of the final fragments. The analysis of the average velocities of the fission
fragments allowed us to parametrize the distance between the two fission fragments at scission as a function of
the size of the fissioning system.