Fragment production in 14N +C, Ni, Ho reactions at 35 MeV/nucleon

Abstract

Inclusive fragment production from the collisions of 35 MeV/Nucleon 14N with carbon, nickel, and holmium targets has been measured in the angular range of 7–23°. The energy spectra of many of the isotopes of Li, Be, B, C and N were determined. In an energy/nucleon representation the spectra at a given angle are similar for all fragments and all targets. The spectra contain contributions mainly from two components, quasielastic and deep inelastic, whose development can be followed as the fragment angle changes. The quasielastic structure, a broad peak, is most pronounced at high fragment energies and at the smaller angles. The deep-inelastic component falls off with fragment energy and becomes dominant at the large angles. The spectra for fragments with 6 ⩽ A ⩽ 12 were decomposed into these two components. The shape of the quasielastic component is consistent with a two-step model in which an early fragmentation is followed by a subsequent mass pick-up from the participant zone. The maxima and the average energies of the quasielastic distributions and the logarithm of the energy integrated quasielastic yields for the different light isotopes depend approximately linearly on angle for all three targets. The relative isotope yields indicate a slight dependence on the neutron/proton ratio of the target for the quasielastic component and a more pronounced one for the deep-inelastic component.