How much, in percent, does the threshold energy of gamma quantum exceed the binding energy

Question 1

How much, in percent, does the threshold energy of gamma quantum exceed the binding energy of a deuteron (Eb = 2.2 MeV) in the reaction γ + H2 → n + p?

Question 2

The formula does not apply here because the photon is always reletivistic. At threshold, the energy of the photon Eγ implies a momentum Eγ/c. The velocity of centre of mass with respect to the rest frame of initial H2 is

Since both n & p are at rest in CM frame at threshold, we write

by conservation of energy. Since the first term is a small correction, we have

kratos · Answer 1 · 2020-05-06T18:50:37+0000

The formula does not apply here because the photon is always reletivistic. At threshold, the energy of the photon Eγ implies a momentum Eγ/c. The velocity of centre of mass with respect to the rest frame of initial H2 is

Since both n & p are at rest in CM frame at threshold, we write

by conservation of energy. Since the first term is a small correction, we have

How much, in percent, does the threshold energy of gamma quantum exceed the binding energy

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How much, in percent, does the threshold energy of gamma quantum exceed the binding energy

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