Fission of U, Th, Bi, Pb, and Au induced by 200 and 300 GeV protons

Cross sections for interactions of 8.8 GeVα particles with Ag, Au, Bi and Th

“…It can be noticed that for particles the ratio is approximately 4-5 times greater than for protons. Let us mention that our results are, within the experimental errors, close to those obtained with the same technique at lower incident energies of e particles [3,7], confirming the observation that binary cross sections do not change significantly for projectile energies greater than 1 GeV [2,3].…”

“…Events with projected angle ~o => 170 ~ were labeled as zc events and those with q) < 170 ~ as z~. rc events, having both tracks in the plane of the beam, were considered to be products of fission because of results of [2], 10 ~ where it was observed that distribution of projected angle between tracks of fission products of U235(n, th,JSC~ is a Gaussian-shape centered at 180 ~ with 98% of all events situated between 170 ~ and 180 ~ . Out-of-plane (of the beam) geometry of 77 events signaled the non-conservation of momentum, i.e.…”