Critical Mass: when the atomic bomb got real
Physics of critical mass for uranium, mostly the work of Rudolf Peierls on nuclear fission and how a simple question from Otto Frisch led to the realization that an atomic bomb was possible.
Follow-up video: How to calculate an atomic bomb's critical mass • How to calculate an atomic bomb's cri...
Playlist Physics of Nuclear Weapons: • Physics of Nuclear Weapons
"Critical Assembly Simulator" by Alex Wellerstein https://blog.nuclearsecrecy.com/misc/...
Erratum: at 3:00 the number of protons and neutrons is incorrect, it should say "U-235: 92 protons + 143 neutrons; U-238: 92 protons + 146 neutrons"
00:00 Introduction
01:01 Nuclear Fission
02:20 Critical mass: Bohr
03:25 Critical mass: Perrin
04:27 Critical mass: Peierls
08:29 Cross section & mean free path
09:59 Critical mass: Frisch-Peierls
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