Excitation-energy influence at the scission configuration

Abstract

Abstract. Transfer-and fusion-induced fission in inverse kinematics was proven to be a powerful tool to investigate nuclear fission, widening the information of the fission fragments and the access to unstable fissioning systems with respect to other experimental approaches. An experimental campaign for fission investigation has being carried out at GANIL with this technique since 2008. In these experiments, a beam of 238 U, accelerated to 6.1 MeV/u, impinges on a 12 C target. Fissioning systems from U to Cf are populated through transfer and fusion reactions, with excitation energies that range from few MeV up to 46 MeV. The use of inverse kinematics, the SPIDER telescope, and the VAMOS spectrometer permitted the characterization of the fissioning system in terms of mass, nuclear charge, and excitation energy, and the isotopic identification of the full fragment distribution. The neutron excess, the total neutron multiplicity, and the even-odd staggering in the nuclear charge of fission fragments are presented as a function of the excitation energy of the fissioning system. Structure effects are observed at Z∼50 and Z∼55, where their impact evolves with the excitation energy.

Detailed modeling of odd–even staggering in fission-fragment charge distributions

“…Finally the green (lower) group of calculated results are obtained when we also decrease the pairing delta to = 0.5 MeV In Ref. [15] a global measure δ glob of odd-even staggering in nuclear charge yields is defined as…”

“…Tracy et al [22] define a local odd-even staggering measure δ loc which specifically applied to charge yields [15] is written…”