From cef040bac8bbbbb7cd9fd0bea11523e3079a20d9 Mon Sep 17 00:00:00 2001 From: Dane Sabo Date: Tue, 17 Sep 2024 19:24:15 -0400 Subject: [PATCH] vault backup: 2024-09-17 19:24:15 --- .../2024-09-17 Module 5 Nuclear Fission Basics.md | 1 + 1 file changed, 1 insertion(+) diff --git a/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-17 Module 5 Nuclear Fission Basics.md b/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-17 Module 5 Nuclear Fission Basics.md index b27154a89..9e7c2215e 100644 --- a/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-17 Module 5 Nuclear Fission Basics.md +++ b/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-17 Module 5 Nuclear Fission Basics.md @@ -38,3 +38,4 @@ Measures how many neutrons produced by each neutron born. There are more formulas in the slides. K can be based on material properties ## Energy Dependence Fission is most efficiently caused by thermal neutrons (energy < 1eV), but neutrons from fission are born at something like \>2MeV. 7 orders of magnitude reduction -- usually kinetic losses by neutrons colliding with things. +Different neutron moderators require a different number of collisions to bring the energy down to thermal. The closer the mass is to that of a neutron, the better. Hydrogen is best, then beryllium, then carbon (graphite). \ No newline at end of file