Question: The cross section for the reaction 75 As(n, ) 76 As is 4.5 b for thermal neutrons. A sample of natural As in the form

The cross section for the reaction 75As(n, ϒ)76As is 4.5 b for thermal neutrons. A sample of natural As in the form of a crystal 1 cm x 2 cm that is 30 mm thick is exposed to a thermal neutron flux of 0.95 x 1013 neutrons/cm2.s. Compute the rate at which this reaction proceeds. (Natural arsenic is 100 percent 75As. Its density is 5.73 gm/cm3.)

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