Measurement of a complete set of nuclides, cross sections, and kinetic energies in spallation of 238U 1A GeV with protons

Spallation residues and fission fragments from 1A GeV 238U projectiles irradiating a liquid hydrogen target were investigated by using the fragment separator at GSI for magnetic selection of reaction products including ray-tracing, energy-loss and time-of-flight techniques. The longitudinal-momentum spectra of identified fragments were analyzed, and evaporation residues and fission fragments could be separated. For 1385 nuclides, production cross sections down to values of 10 microb with a mean accuracy of 15%, velocities in the uranium rest frame and kinetic energies were determined. In the reaction all elements from uranium to nitrogen were found, each with a large number of isotopes.

A STUDY OF Cd115m,g FORMED IN THE FISSION OF NATURAL URANIUM BY PROTONS OF ENERGIES 8 TO 60 MEV

Excitation functions have been measured for the formation of Cd115m, Cd115g, and Ag115g produced in the fission of natural uranium induced by protons of energies 8 to 60 Mev. The isomer yield ratio for Cd115m,g was found to increase with increasing proton bombarding energy over the range 20 to 60 Mev in contrast to the published results for the deuteron fission of uranium, for which a minimum was found.