Evaluation of damage in neutron irradiated boron carbide

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:434

Article

Gosset, Dominique¹  Herter, Patrick²  Motte, Vianney¹ 

[1] Univ Paris Saclay, CEA, DEN SRMA, F-91191 Gif Sur Yvette, France

[2] Univ Paris Saclay, CEA, DEN DISN VALO, F-91191 Gif Sur Yvette, France

关键词: Neutron absorber;    Damage rate;    Boron carbide;    Ion implantation simulation;   

DOI  :  10.1016/j.nimb.2018.08.021

来源: Elsevier

【 摘 要 】

When irradiated in a reactor, neutron absorber materials undergo two different damages induced, first, by the elastic scattering of neutrons; second by the neutron absorption reactions. In boron carbide irradiated in a fast neutron flux, neutron scattering and the slowing-down of He and Li arising from the (n,alpha) absorption reaction both lead to the displacement of B and C atoms which energy ranges up to a few MeV. Simulating the neutron damage by ion irradiation requires the calculation of the damage produced in both cases. In this paper we propose an estimation of the actual defect production rate resulting from the fast neutron irradiation. For this, we first estimate the energy spectra of both the primary knocked-on atoms and atoms created by the absorption reactions, here in a Phenix-like neutron spectrum. We then deduce from SRIM calculations the actual energy distribution of all the atoms displaced along the displacements cascades induced by those primary projectiles. At last, we obtain an estimation of the number of displaced atoms per produced helium, about 305, most of them resulting from neutron scattering. This is far from a Kinchin-Pease or NRT estimation, of the order of several thousands, this arising from the fact that most of the energy is dissipated through electronic interactions. Such results are then used in order to perform ion irradiations aiming at a realistic simulation of synergetic effects of helium implantation and damage production.

【 授权许可】

Free