In the mid-eighties, it was beisichronobiological changes of tng intensely developed Cuban Nuclear Program, one of the most current and necessary subjects, related to the creation of a research group aimed at studying nuclear fission. Its main objective was to qualify a team of young researchers from the Higher Institute of Sciences and Nuclear Technologies (ISCTN) and from the Center of Technological Applications and Nuclear Development (CEADEN), in the most modern theoretical conceptions and experimental methods, in order to be able to assimilate and develop, at the same time, leading-edge researches in this field.

After almost 15 years, it is opportune to highlight that the objective has been completely reached. The works constitute a scientific contribution in the current state of scientific knowledge and technological art state in nuclear fission. Their main scientific contribution lies in the description, from a unified focus, of the different ways of nuclei decay along the periodic table. These include from the most symmetrical ways (fission like) until the extremely asymmetric ones (emission of protons), all in the context of the same theoretical formalism. The region of the deformed nuclei is also explored from the perspective of complexity of the nuclear potential energy's surface, developing calculation tools able to approach current problems as parity violation in nuclear reactions.

These subjects constitute modern work directions both theoretical and experimental from important international laboratories, in which the scientific community is working intensely, as it is proved by the fact that these have been carried out collectively by the laboratory of lineal accelerator of the University of Sao Pablo, the Brazilian Center of Physical Research, the Autonomous University of Madrid and the Institute of Radioprotection and Dosimetry of Rio deJaneiro. Due to its importance, it was also created for this research a Project of International Collaboration, with the University Justus von Liebig from RFA that works with the UNAM from Mexico.

The results obtained have been published or recently accepted in the most prestigious international magazines, such as: Nucl.Part.Phys, Nuclear Phys. To, European Journal of Physics, Physical Review Letters, Phys Rev.C and Journal of Physics G, among others.