The Bethe–Feynman efficiency formula, a simple method for calculating the yield of a fission bomb, was first derived in 1943 after development in 1942. Aspects of the formula are speculated to be secret restricted data.

Related formula

  • a = internal energy per gram
  • b = growth rate
  • c = sphere radius

a ≈ ( b c ) 2 f {\displaystyle a\approx (bc)^{2}f}

A numerical coefficient would then be included to create the Bethe–Feynman formula—increasing accuracy by more than an order of magnitude.

E f f = ( E 2 γ − 1 ) ⋅ α m a x 2 ⋅ R c r i t 2 ⋅ ( δ 1 − δ ) ⋅ ( 2 3 δ 2 ) {\displaystyle E_{f}f=\left({\frac {E_{2}}{\gamma -1}}\right)\cdot \alpha _{max}^{2}\cdot R_{crit}^{2}\cdot \left({\frac {\delta }{1-\delta }}\right)\cdot \left({\frac {2 3\delta }{2}}\right)}

where γ is the thermodynamic exponent of a photon gas, E2 is the prompt energy density of the fuel, α is Vn (neutron velocity) / λmfptot (total reaction mean free path), Rcrit is the critical radius and 𝛿 is the excess supercritical radius (Rcore - Rcrit) / Rcrit.

See also

  • Richard Feynman
  • Hans Bethe
  • Robert Serber

References



Einfach erklärt Mit der FeynmanMethode 4x schneller lernen und verstehen

Die Feynman Methode NerdEcke Amino

PhysicsBethe formula HandWiki

Feynman diagrams for the BetheHeitler processes. An photon

Feynman Diagrams representing the BetheSalpeter equation for the