Introduction to the Physics of the HETC/LHI/SGS (High Energy Transport Code/Light Heavy Ion/Spallation Gamma Source) Radiation Transport Code

摘要

The physics of the three-dimensional, Monte Carlo, general combinatorial geometry High Energy Transport Code (HETC)/Light Heavy Ion (LHI)/Spallation Gamma Source (SGS) radiation transport code system, used to transport neutrons, protons, pions, muons, photons, < or = deuterons, tritons, He3's, alpha particles, and other light heavy nuclei with 5 < or = A < or = 10 through complex materials and geometries, is discussed at an introductory level. The term system is used because HETC/LHI/SGS is really a collection of three and one-half separate codes linked together: (1) HET, which transports high-energy neutrons ( approx. > 15 MeV), protons, pion, and muons; (2) SGS, which calculates the energies of the gamma-ray photons emitted in the final de-excitation of the excited residual nucleus remaining after a non-elastic nucleon-nucleus or pion-nucleus collision in HET (note SGS is not itself a transport code); (3) MORSE, which transports low energy neutrons ( approximately < 15 MeV) and does all photon transport; and (3 1/2) LHI, an addition to HET to allow the partial transport of high-energy light heavy projectiles with 2 < or = A < or = 10. The MORSE code is not discussed. (Author)