11. Also, you can define the temperature of a single particle, there are thermal neutrons . 12. The HB-1 and HB-3 thermal neutron beam tube designs are identical except for the length. 13. Since neutrons are neutral particles, they do not have to overcome cold or thermal neutrons . 14. Thermal neutrons are produced that collide with the nuclei of nitrogen-14, forming carbon-14 and a proton.15. A typical reactor used for activation uses uranium eV . These neutrons are termed thermal neutrons . 16. Only the odd-mass isotopes of plutonium are fissile with thermal neutrons , and the even-mass isotopes accumulate. 17. Ancient and historic steel in Japan, India and Europe, a non-invasive comparative study using thermal neutron diffraction. 18. A Helium-3 ( He-3 ) filled proportional counter is the most common epithermal and thermal neutron detector. 19. Intermediate-energy neutrons have poorer fission / capture ratios than either fast or thermal neutrons for most fuels. 20. Thermal neutrons are cosmic-ray-generated neutrons which have lost much of their energy in collisions with hydrogen atoms.
