Abstract
The kinetic-energy spectra of nuclei and alpha particles formed as a result of the nuclear reaction between projectiles of energies 3.0-3.75 MeV and targets have been studied by a particle-selection system using a gas proportional counter () with a very thin window (∼35 μg/) and solid-state detectors to measure the energy. No evidence could be found for discrete energy groups such as would result from a two-product reaction producing in its ground state or first excited state. The spectrum is an energy continuum, whereas the alpha-particle spectrum has discrete energies as well as an energy continuum. Absolute values of have been obtained for these continua in the barycentric system. By extrapolation of the observed results, the total cross section for the continuum is estimated to be 24±8 mb, whereas for the alpha continuum, which has contributions from some other reactions also, is estimated to be 103±30 mb. The reaction is interpreted as predominantly a direct three-body breakup and sequential decay through highly excited states in . Absolute differential cross sections for the four highest alpha groups from the concomitant reaction are also given.
- Received 25 August 1965
DOI:https://doi.org/10.1103/PhysRev.142.612
©1966 American Physical Society