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How many collisions are required to slow a neutron from an energy of .5 MeV to...

How many collisions are required to slow a neutron from an energy of .5 MeV to a thermal energy of .025 eV using carbon as a moderator? For Carbon, ?=0.158

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Answer #1

0.5*10^6 / 0.025 = e^(0.158*n)

n=107

N = ln(0.5*10^6 / 0.025) / 0.158

N = 16.81124283/0.158 = 106.4

N=107

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