The 19F(3He,3H)19Ne reaction has been used to study the levels in 19Ne that are important for astrophysical processes. Suppose that the 3He beam with energy of 24 MeV (in Lab frame) is bombarded on a 19F target with thickness of 1019 atoms/cm2. The beam current is 10 nA for the 3He beam (charge state 2+). The reaction product 3H particles with kinetic energy of 20.7 MeV (in Lab frame) are detected at a polar angle of 5 degrees (in Lab frame) by a detector that covers solid angles of 0.005 sr. A count rate of 10 per second is observed for the 3H particles.
(a) What is the threshold energy for this reaction to occur?
(b) What is its di?erential cross section measured at 5 degrees?
(c) What is the corresponding center of mass angle for the 5 degree Lab angle?