CAPTURE CROSS SECTIONS FOR NEUTRONS WITH ENERGY TO 50 KEV OF SEVERAL STRUCTURAL MATERIALS AND ACTIVATION OF VARIOUS MATERIALS DURING THEIR IRRADIATION BY PROTONS WITH ENERGIES OF 660MEV,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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On neutron a spectrometer, by time of delay in lead, capture cross sections of neutrons with energy to 50 kev were measured in nickel, copper, molybdenum, and tungsten. Previously unknown resonances of nickel 2.3 kev, Cu63 -100 ev, Mo98 12 ev were discovered, and their parameters were estimated. Radiation widths of resonances of copper at energies of 227 and 580 ev were equal to about 1.6 ev. Resonance integrals of absorption for the studied substances are given. Kapchigashev and Popov. Activation of materials was measured at various times after their irradiation for a duration of 40 min by protons with energy of 660 Mev. Specific activity calculated for long time of irradiation, depending upon the substance, changed from 15 to 700 micro-g equiv Rag for 1 hr after irradiation by a stream of protons equal to 10 to the 10th power protonsq cm. sec. Close agreement was observed between calculated and experimental data, both on yield of activity and on speed of its decrease in time. Komochkov.