## [answered] Calculate the macroscopic thermal neutron absorption cross

Calculate the macroscopic thermal neutron absorption cross section for natural uranium. (ignore the trace amounts of234U; the a/o of235U in natural uranium is .72, and the a/o of the238U is .9928)?(30 points)

1. Calculate the macroscopic thermal neutron absorption cross section for uranium enriched to 5% a/o235U.(30 points)
2. Calculate the mean free path for scattering of neutrons in light water. The scattering cross-section for water is 103 barns and the number density of water is .03343x1024atoms/cm3.?(15 points)
3. Plot on an Excel graph the change in the absorption cross section of10B over the temperature range of 68?F to 600?F. Assume the microscopic absorption cross-section of10B is 3840 barns at 68?F.?(25 points)

1. Calculate the macroscopic thermal neutron absorption cross section for natural uranium.

(ignore the trace amounts of 234U; the a/o of 235U in natural uranium is .72, and the a/o of

the 238U is .9928) 2. Calculate the macroscopic thermal neutron absorption cross section for uranium enriched to 5%

a/o 235U. 3. Calculate the mean free path for scattering of neutrons in light water. The scattering crosssection for water is 103 barns and the number density of water is .03343x1024 atoms/cm3.

4. Plot on an Excel graph the change in the absorption cross section of 10B over the temperature

range of 68?F to 600?F. Assume the microscopic absorption cross-section of 10B is 3840 barns at

68?F.

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