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Primary radiation damage due to neutron interactions using inexplicit evaluated nuclear data: a case study in isotopes of tungsten using ENDF\(/\)B-VIII.0 and TENDL-2019

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Abstract

Several intense energy irradiation testing facilities are functional to study the effects of radiation damage in fusion materials. Tungsten is a potential candidate material to build the plasma-facing armour components of fusion reactors. Therefore, it is vital to estimate the radiation-induced primary damage in the material, particularly due to the large amount of transmutation nuclides produced in the high-energy neutron sources. The basic evaluated nuclear data libraries provide the essential neutron reaction data to estimate the transmutations and their effects during irradiation. However, much of the important high-energy neutron reaction data are often not explicitly provided to directly study their impact on radiation damage. Such inexplicit nuclear reaction data, especially for the transmutation nuclides, can have a significant effect on the estimation of primary radiation damage. A new specific methodology has been developed to unravel information from these inexplicit nuclear reaction data from the basic ENDF-6 libraries and use them with explicit data for estimating the primary radiation damage. The energy distributions of transmuted nuclides (the recoil nuclei in general) and light charged particles produced as a result of several types of neutron–nucleus interactions in tungsten, are quantified using the cross-sections from ENDF\(/\)B-VIII.0 and TENDL-2019 basic evaluated nuclear data libraries and their inter-comparisons are carried out. The neutron-induced atomic displacements and heating in tungsten are estimated for irradiations under the fusion and IFMIF-DLi neutron spectra. It shows that the transmutation reactions under these neutron spectra can sometimes contribute more than 50% of the total primary damage, most of which can be from inexplicit nuclear reaction data. Significant differences between the two sources of basic evaluated nuclear data libraries, especially in the production of transmutation nuclides and consequently, in their contributions to damage are observed. The present study helps to illustrate the importance of inexplicit nuclear reaction data and the usefulness of the ENDF-6 libraries for estimating primary radiation damage due to transmutations in plasma-facing materials.

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Acknowledgements

The author gratefully acknowledges the insightful and interesting discussions and valuable guidance of Prof. K Devan and Prof. S Ganesan on the subject of nuclear data and nuclear reactor physics. The author is also thankful to the editor and reviewers for critically reviewing the manuscript and providing important feedback to make the final manuscript better.

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Authors and Affiliations

  1. Department of Applied Physics, Aalto University, 00076, Espoo, Finland

    Uttiyoarnab Saha

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  1. Uttiyoarnab Saha
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Correspondence to Uttiyoarnab Saha.

Appendix

Appendix

Estimation of the impact of using the explicit and inexplicit neutron reaction data in TENDL-2021 in primary radiation damage production in tungsten and its isotopes (tables A.1, A.2, A.3, A.4).

Table A.1 Numbers of explicit neutron transmutation interactions and transmuted nuclides that are implicit in inexplicit reaction data (up to 200 MeV).
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Table A.2 Neutron-induced dpa under ITER-DT and IFMIF-DLi neutron spectra.
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Table A.3 Neutron heating rate under ITER-DT and IFMIF-DLi neutron spectra.
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Table A.4 184W(n, np)183Ta reaction cross-section at 14 MeV and corresponding damage parameters.
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Saha, U. Primary radiation damage due to neutron interactions using inexplicit evaluated nuclear data: a case study in isotopes of tungsten using ENDF\(/\)B-VIII.0 and TENDL-2019. Pramana - J Phys 98, 5 (2024). https://doi.org/10.1007/s12043-023-02682-2

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  • DOI: https://doi.org/10.1007/s12043-023-02682-2

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