Physics list for astrophysical reaction 14N(p,gamma)15O

Physics Processes, Models and Cross Sections
1

Hello,
I am currently working on simulating the astrophysical reaction ¹⁴N(p,γ)¹⁵O in Geant4, using a low-energy proton beam in the range of 0.3 to 1 MeV.

I would like to know:

  1. Which physics list is most appropriate for accurately modeling this type of nuclear reaction, especially given the low energy of the protons?
  2. Given that the cross section is extremely small(on the order of nanobarns), is it feasible to simulate such a rare reaction in Geant4? If so, what strategies or techniques (e.g., biasing, event generators) would you recommend to improve simulation efficiency?

Thank you for your guidance.

_Geant4 Version:_11.3.0
_Operating System:_Ubuntu
Compiler/Version:
_CMake Version:_3.28.3

2

TestEM0, TestEM1, and Hadr03 will probably be very helpful to model how you might check the cross sections you are interested in. RDecay01, RDecay02, and the shielding physics lists might be all you need for such low energy interactions. With maybe some tweaking of the EM physics lists used.

GB01 for cross section biasing would allow you to arbitrarily enhance whatever process of interest. You will just have to be cautious about any unintended biases in your analysis which is common in variance reduction methods.