target 1 cm2 in area and 0. 1 cm thick. There are 0.048 x 1 024 atoms per cm3 in the target, and the total cross-section at the energy of the beam is 4.5 b.
(a) What is the macroscopic total cross-section?
(b) How many neutron interactions per second occur in the target?
(c) What is the collision density?