Fragment Distributions of Transfer- and Fusion-Induced Fission from 238U+12C Reactions Measured Through Inverse Kinematics

Resumo

Transfer- and fussion-induced fission in inverse kinematics was proven to be a very powerful tool to investigate nuclear fission, widening the information of the fission fragments and the exoticity of the fissioning systems. A campaign for fission investigation is being carried out in GANIL with this technique. In these experiments, a beam of 238-U, accelerated to 6.1 MeV/u, impinges on a carbon target. Fissioning systems from U to Am are populated by transfer reactions, with excitation energies that range from few MeV up to 20 MeV, and fussion reactions that reach higher excitation energy.The use of inverse kinematics and the VAMOS spectrometer permits the measurement of isotopic yields of the fission fragments over the complete fragment distribution in the produced fissioning systems, most of them exotic nuclei, as a function of the induced excitation energy. With this information, it is possible to obtain the neutron excess of the fragments, as well as the neutron multiplicity and the Z even-odd staggering . These observables allow the investigation of the role of nuclear structure, the sharing of excitation energy, and the scission configuration along the full fragment distribution. These new results help to determine the features of the fission process, which is of importance for the design of new-generation nuclear power plants and for the incineration of nuclear waste. In addition, they can also be useful for RIB production.