The range and relative rates of energy loss in Al and Au have been measured radiochemically for five products from thermal-neutron-induced fission of U235. Range-velocity relationships for the median light product of fission and the median heavy product have been obtained from these measurements and other workers' energy-loss data. The relation of range (R) to energy (E) or velocity (v) can be fitted to functions of the form .R = kV-or R We have assumed that these functional forms can be applie.d to fission products of any mass. The constants K and. were determined from values of the range and kinetic energy for products of high yield. The values of these .constants have been extrapolated to products of low yield. We have estimated kiretic energies, heretofore unmeasured, from the ranges of low-yield products. We have interpreted certain radiochemical observations in terms of the average component of the range perpendicular to the original velocity. The value of this component in Au has been estimated to be about one-fifth the total range. This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: Makes any warranty or representation, expressed or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, appáratus, method, or process disclosed'in this report may not infringe privately owne.d rights; or Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission, or employee, of such contractor, to the extent that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employment or contract with the Commission, or his employment with such contractor.
We report radiochemical investigations of Cu 64 -67 , Mo", Ag 111 , Pd 112 , and I 121-^ produced from irradiations of U 238 with high-energy protons. Cross sections are given for proton energies between 0.5 and 6.2 GeV. Recoil properties from thick targets are reported for irradiations with 0.72-and 6.2-GeV protons.All the products investigated at 0.72 GeV result from nuclear fission. Deposition energies are of the same order as calculated for all nucleon-nucleon collision cascades. Excitation functions and the relative values of the deposition energies are reasonably well reconciled with nucleonic cascade followed by fission.Proton irradiations at 6.2 GeV produce Mo 99 , Ag 111 , Pd 112 , and p**-* 1 ** by nuclear fission after depositing an average of <200 MeV in the struck nuclei. Cu 64 is probably not produced by binary fission. The neutrondeficient iodine isotopes are probably produced by a fast process. A correlation is suggested with fragment (A «20 to 60) production.
2659 the 1.84-and 2.42-MeV levels in Ca 42 ), the good fits obtained suggest that the model deserves further attention. Kisslinger and Sorensen 6 have made an extensive study of levels using a model based on strong shortrange (pairing) forces and longer range (P 2 ) forces; however, they have not extended their model to include nuclides below the N=2S shell. ACKNOWLEDGMENTSWe wish to acknowledge the cooperation of Dr. Donald R. F. Cochran of Los Alamos in the early phases 6 B.
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