Self-sustaining Chain reaction 裂变碎片 鲁● Dec. 2. 1942. Fermi achieved 中子 ●“的 sustained chain reaction and the first fission reactor provided 铀-235 :● data for future design of nuclear
Self-sustaining Chain reaction Dec. 2, 1942, Fermi achieved sustained chain reaction, and the first fission reactor provided data for future design of nuclear reactors
The visⅰon It is not too much to expect that our children will enjoy in their homes nuclear generated electrical energy too cheap to meter. Lewis Strauss, Chairman of the u.s Atomic Energy Commission(1954)
The Vision • “It is not too much to expect that our children will enjoy in their homes [nuclear generated] electrical energy too cheap to meter.” – Lewis Strauss, Chairman of the U.S. Atomic Energy Commission (1954)
TTT 235 U sonnnooa 10 10 10 10 10 10 10 10 10 Neutron energy (Mev) The total and fission cross section for 235u based on njoy processed ENDF/B(version v data
The total and fission cross section for 235U based on NJOYprocessed ENDF/B (version V) data
Why neutron moderation is needed? x(E)=0.453ex(-1.036E)sinh(2.29E)0 10 0 leutron energy(Mev) Fission neutron energy spectrum The average energy of prompt fission neutrons is about 2 MeV
Fission neutron energy spectrum Why neutron moderation is needed? The average energy of prompt fission neutrons is about 2 MeV
Reactions Involving neutrons neutron emission scattering elastic lsotropic anisotropic inelastic: n, n) (n,2n),(n,3n),(n,pn) bsorption capture:(n, y) nonelastic ),(n,p) nuclear fission: (n, f)
Reactions Involving Neutrons