A radioactive ion beam facility using photofission

Cross sections of neutron-induced reactions

“…The given parametrization has an advantage as phenomenological optical model potentials are limited up to 150-200 MeV; however, they are expected to be more accurate in that energy range. We conclude that these neutron-nucleus reaction cross sections are very useful for the theoretical calculations of radioactive ion beam [22,23] production. These can also be used for performing Hauser-Feshbach [24] calculations with Monte Carlo simulations [25] to estimate the cross sections for neutron induced fission [26], evaporation residues, or evaporation neutron multiplicities [27] and for comparison of the photon [26,27] versus nucleon induced fission as well.…”

Radioactive decays at limits of nuclear stability

“…The photons inducing fission may be produced directly, e.g. by converting an intense electron beam into bremsstrahlung (Diamond, 1999) or they can be virtual, resulting from a fast motion of a fissile system relative to a high-Z tar-get (Bertulani and Baur, 1986). The higher excitation energies are achieved by bombarding fissile targets with beams of fast neutrons or charged particles.…”

Angular distributions of neutron-nucleus collisions

“…The total and reaction cross sections of neutron-nucleus collisions for energies up to 600 MeV or more, are required in a number of fields of study in basic science [1,2] as well as many of applied nature [3][4][5][6][7][8][9]. Often, these cross sections are evaluated using phenomenological optical potentials, and much effort has gone into defining global sets of parameter values for those optical potentials with which to estimate cross sections as yet unmeasured.…”

“…We conclude that the present estimates of neutron scattering cross sections are very important for the reactor physics calculations [3][4][5][6][7][8][9] of the Accelerator Driven Sub-critical Systems (ADSS) applications. The neutron-nucleus reaction cross sections are very useful for the theoretical calculations of radioactive ion beam [1,2] production or for performing Hauser-Feshbach [26] calculations with Monte Carlo simulations [27] to estimate the cross sections for neutron-induced fission and neutron multiplicities [28], and they may serve as inputs to intranuclear cascade codes such as the MCNPX package. Although the simple semiclassical optical model obtained to calculate total cross sections up to 600 MeV are very useful and almost as accurate as the phenomenological optical model potentials which are limited to 150-200 MeV, the results for the angular distributions (differential cross sections) agree reasonably with the experimental data only at forward angles below 30 • , implying that they are expected to be more accurate for optical model calculations.…”