Use 1 = (b) | b 1/k to obtain the phase shift 1 for

Use δ₁ = ∆(b) | _{b – 1/k} to obtain the phase shift δ₁ for scattering at high energies by 

(a) The Gaussian potential, V = V₀ exp (– r² / a²), and

(b) The Yukawa potential, V = V₀ exp (– μr / μr. Verify the assertion that δ₁ goes to zero very rapidly with increasing l (k fixed for l >> kR, where R is the “range” of the potential. {The formula for ∆(b) is given in (7.4.14)].