Nuclear Data Library for Heavy Nuclei
Development of Nuclear Data Library for Nucleon-Induced Reactions on Heavy Nuclei in Wide Energy Region
Tech Area / Field
- FIR-NOT/Nuclear and Other Technical Data/Fission Reactors
- PHY-ANU/Atomic and Nuclear Physics/Physics
8 Project completed
Senior Project Manager
Kulikov G G
Khlopin Radium Institute, Russia, St Petersburg
- Texas A&M University, USA, TX, College Station\nForschungszentrum Karlsruhe Technik und Umwelt, Germany, Karlsruhe\nInternational Atomic Energy Agency / Nuclear Data Section, Austria, Vienna\nKyungpook National University / The Center for High Energy Physics, Korea, Taegu
Project summaryDevelopment of modern accelerator-driven nuclear technologies requires the large amount of nuclear data to supply the necessities in the working out of the conceptual and design solutions in different fields of applications first at all the technologies of the radioactive waste transmutations and power productions, radiotherapy, shielding problem and so on. The nuclear data on nucleon-induced reactions in wide energy diapason are also necessary for the basic investigations and knowledge of the fundamental processes of nuclear reactions, nuclear structure and nuclear astrophysics.
In this work the development of the theoretical nuclear data libraries as well as corresponding computer codes is proposed for nuclear reactions induced by proton and neutron beams on heavy nuclei from Pb to Cf in energy region 20 MeV – 3 GeV for proton and 20 MeV – 1 GeV for neutron induced reactions. The necessity of this kind of data is mostly defined by hybrid technologies of waste transmutations and power productions where the secondary neutrons are generated on massive Pb-Bi targets and elements of the uranium or thorium cycle are proposed to use as a nuclear fuel. The large amount of the necessary nuclear data on cross-sections and reactions product yields for the wide range of nuclides and beam energies puts forward the problem of accumulation of calculated data on the base of modern reliable physical models of nuclear reactions and development of corresponding computer codes. The data libraries formed in the ENDF-6 format takes one possibility to use the data in the MCNP-like transport codes and verify it in the integral experiments with the thick targets. Besides, the data obtained could be checked in the direct comparison with available experimental results, too.
The following nuclear reaction characteristics will be placed in the data library:
– the total reaction cross-sections and cross-sections of elastic interactions;
– the fission cross-sections;
– the multiplicities of the secondary neutrons and protons including emission from fission fragments;
– double-differential cross-sections for secondary neutrons and protons production including emission from fission fragments;
– yields of residual nuclei including fission fragment yields.
Calculations of this set of data will be performed with modified computer code MCFx developed before by us in the framework of #964 ISTC project “DEVELOPMENT OF MODEL CODE AND THEORETICAL DATA LIBRARY ON HEAVY NUCLEI FISSION CROSS-SECTIONS IN A WIDE ENERGY RANGE”. The code developed is based on the detailed description of the all stages of nuclear reaction induced by the intermediate energy nucleons and use the well-checked and reliable models for the entrance channel simulation (coupled channel method), direct processes (intranuclear cascade model), pre-equilibrium particle emission (hybrid exciton model with multiple particle emission), and competition of particle evaporation/fission at the final stage of the reaction (detailed statistical model). The fission cross-section calculations were carried out for neutron and proton-induced fission reactions on nuclei from Pb to Pu in energy region 20-200 MeV. Calculation results are in the good agreement with the experimental data. The approach developed in #964 ISTC project will be a base for the new code which gives us possibility to compute more complete and reliable set of nuclear data.
The proposed work is a prolongation of the previous #964 ISTC Project and will be performed by the same team mainly from the V.G. Khlopin Radium Institute where the large experience of the theoretical and experimental investigations of nuclear reactions on the heavy nuclei has been accumulated. The project team includes one Doctor of Science and 6 Candidates of Science. The project performance will provide former weapons scientists opportunities for the peaceful research and development investigations and develop the basic and applied activity in the field of radioactive waste transmutation and power production.
The project duration is 36 months. For this period the following results will be obtained:
– the analysis of existing experimental and theoretical results for the nucleon-induced reactions on the heavy nuclei for beam energy more then 20 MeV;
– the new calculation models and corresponding program blocks will be developed and tested;
– the modification of the developed models and codes developed in the previous project will be performed;
– the test calculations will be done and the analysis and comparison with the experimental data will be carried out;
– the systematic calculations for the proton-induced reaction up to 3 GeV and neutron-induced reactions up to 1 GeV on nuclei from Pb to Cf will be performed;
– the nuclear data files will be formed in the ENDF-6 format.
The work execution will be done in the close contact with the foreign collaborators (Japan) by means of results discussion, working out of reaction priority list, information exchange and assistance for project participants to participate in the international meetings in the project fields.
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