New Evidence for a Direct Process in the (<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>e</mi><mo>,</mo><mi> </mi><mi>α</mi></math></span>) Reaction

A. G. Flowers; A. C. Shotter; D. Branford; J. C. McGeorge; R. O. Owens

doi:10.1103/PhysRevLett.40.709

New Evidence for a Direct Process in the ( $e, α$ ) Reaction

A. G. Flowers, A. C. Shotter, D. Branford, J. C. McGeorge, and R. O. Owens

Phys. Rev. Lett. 40, 709 – Published 13 March 1978

Abstract

Alpha-particle energy and angular distributions have been measured for the reaction ${}^{60}{Ni} (e, α) e^{'} X$ using electrons of energies 33, 60, and 120 MeV. Statistical-model calculations give good quantitative agreement in the region of the peak of the $α$ energy spectra. Higher-energy $α$ particles exhibit a forward-peaked angular distribution and a cross section several orders of magnitude above the statistical-model predictions, indicating the presence of a direct-reaction component.