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  1. Consider the scattering of neutrons by protons at very low energy due to a nuclear potential of range r0. Given that, 
    cot(kr0 + δ) ≈ -Ï’/k 
    where δ is the phase shift, k the wave number and (-ϒ)the logarithmic derivative of the deuteron ground state wave function, the phase shift is
    2. A.
    δ ≈ -k/ϒ - kr0
    B.
    δ ≈ -ϒ/k - kr0
    C.
    δ ≈ -π/2 - kr0
    D.
    δ ≈ π/2 - kr0

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    Answer : Option A

    Explanation :

    -NA-

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