Relativistic effect on atomic displacement damage for two-body inducing discrete reactions

• Published in: EPJ Web of Conferences Vol. 239; p. 8004
• Main Authors: Chen, Shengli, Bernard, David, De Saint Jean, Cyrille
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 2020
• Subjects: Body kinematics; Damage; Elastic scattering; Energy; Iron isotopes; Nuclei; Recoil; Relativistic effects
• ISSN: 2100-014X; 2101-6275; 2100-014X
• DOI: 10.1051/epjconf/202023908004

The relativistic effect on two-body discrete reaction inducing atomic recoil energy and the sequent damage energy is studied for
6
Li,
56
Fe,
184
W, and
238
U. The relativistic correction is within 1% if incident neutron energy is below 20 MeV. For incident neutron energy up to 200 MeV or even 800 MeV, the relativistic effect should be taken into account for treating two-body kinematics. The relativistic correction is about 0.05E
in
/MeV% for neutron elastic scattering for nuclei from
56
Fe to
238
U and smaller for (n,α) and (n,t) reactions. Analyses on damage energy show that the relativistic corrections are generally within 2% for incident neutron below 200 MeV for nuclei lighter than
56
Fe because of the “saturation” of damage energy. However, the current damage theory cannot be applied for Primary Knock-on Atom (PKA) energy higher than 24.9
A
R
Z
R
4/3
keV, which is 10 times lower than the maximum PKA energy for D+T fusion neutron elastic scattering of
6
Li.