Abstract
Analysis of neutron distribution was carried out for two elongated targets. The targets have cylindrical shape and are made of lead and carbon, respectively. The dimensions are approximately one meter in length and 19 cm in diameter. The targets were irradiated with 660 MeV proton beam at Phasotron accelerator at the Joint Institute for Nuclear Research. The total number of protons was 2.35(18)E15 for the experiment with carbon target and the total number of particles at the second experiment was 2.32(19)E15. The produced neutron field was monitored by cobalt threshold activation detectors at various positions. The activation detectors were measured by means of gamma spectroscopy using HPGe detectors. Reaction rates of different radionuclides produced in the activation detectors were determined and the results from both experiments were compared. The ratios were calculated for 7 reactions produced in cobalt detectors. The ratio of the reaction rates shows that the number of residual nuclei with higher threshold energies is higher for experiment with carbon target than for the experiment with the lead target.
Highlights
Nuclear power plants generate increasing volume of Spent Nuclear Fuel (SNF) each year and reserves of fresh fuel are limited
Reaction rates of radionuclides produced in 59Co samples, which were induced by neutron field generated in elongated target, are presented in Figures 5, 6, and 7
Other reaction rates for the following reactions were higher in the experiment with the lead target and a "breaking point", position where the reaction rates from experiment with lead target were higher than results at carbon target, changed at various longitudinal distances
Summary
Nuclear power plants generate increasing volume of Spent Nuclear Fuel (SNF) each year and reserves of fresh fuel are limited. The experimental research on ADS is conducted from the beginning of 1990’s, where two main projects were presented. One of the most important part of the ADS is the spallation target which generates neutrons by interactions of proton beam with the target. Material of the target is selected as heavy metals because the number of neutron produced by interaction with one proton is in the range of 20-30 [4]. The idea to irradiate light material mixed with heavy material was experimentally performed in Japan, where a multitarget made from lead and beryllium was irradiated by 100 MeV protons [5]. The similar idea is planned at the Joint Institute for Nuclear Research (JINR). Two elongated targets from lead and carbon were irradiated by high energy proton beam.
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