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The still increasing and developing world population demands more energy. Further burning of coal, oil and gas produces still more CO2 deteriorating the climate. Anyhow, oil and gas will run out in the middle of the century. Planning a decent future with a minimum supply of energy for those who will follow us, requires re-examining all possibilities of non-polluting, renewable, and sustainable energies including nuclear options. There are two nuclear reactions which allow for a long-term exploitation: (i) converting H into He by fusion or (ii) converting U and Th into Pu and U to be burnt by fission. In this paper, the fission option is the target. The real long-term reserves of fission energy lie in the even-even isotopes U and Th, as the supplies of U, like fossil fuels, are restricted, as well. The remaining U and available Pu could be burnt in a 3 generation of reactors (EPR) using mixed U/Pu-fuel (MOX). Aiming at a contribution of fission energy to the world electricity production of one third, that is three times more nuclear power than today, reactors of a 4 generation should be envisaged, ready to wide technological applications in the middle of the century. Such an option could be foreseen as an implement of a peaceful future.

A new method for the isotopic separation of projectile fragments is exposed. The application to the LISE spectrometer at GANIL provided radioactivity data on light neutron‐rich nuclei (mass range 14–40). The observation on 17B of the beta‐delayed four neutron decay mode is reported for the first time.