Recent content by yelneerg

I think I may need to use variational principle?

Homework Statement Evaluate the so-called Direct (or Coulomb) Integral, C, which occurs in the theory of the 2-electron atom. C=\int\int d\vec{r}_1d\vec{r}_2\left|\phi_a(1)\right|^2\left|\phi_b(2)\right|^2 \frac{e^2}{\left|\vec{r}_1-\vec{r}_2\right|} You may assume that both...

Alright, so after spending several more hours on this I think the key is to take the inner product of the initial and final momentum 4-vectors in each frame and set them equal: Let p and q represent the initial and final momentum of particle A (with primes to indicate CM frame and non-prime...

Homework Statement Take the case of elastic scattering (A+B -> A+B); if particle A carries energy EA', and scatters at an angle θ, in the CM (center of mass/momentum frame), what is its energy in the Breit* frame? Find the velocity of the Breit frame (magnitude and direction) relative to the...