He-3(n,p)H-3 Reaction: Fusion Rate Measurement by Neutron Count

[TESL@]

Since D-D fusion releases H-3 + p and He-3 + n, how does the reaction He-3(n,p)H-3 occurring affect measurement of fusion rate by neutron count?

In other words, do I have to take He-3 absorbing neutrons into account while calculating the fusion rate or in what conditions can I neglect it?

Thank you.

 

[mfb]

If the cross-section is relevant, then sure you have to take it into account.

 

[Astronuc]

Since D-D fusion releases H-3 + p and He-3 + n, how does the reaction He-3(n,p)H-3 occurring affect measurement of fusion rate by neutron count?

In other words, do I have to take He-3 absorbing neutrons into account while calculating the fusion rate or in what conditions can I neglect it?

Thank you.

The He-3(n,p)H-3 has a very low microscopic cross-section, < 1 b, above 1 MeV. It is primarily a thermal neutron absorber.
http://www.nndc.bnl.gov/sigma/index.jsp?as=3&lib=endfb7.1&nsub=10

Combined the very low density, it is low probability of occurring, and the neutron is more likely to escape the plasma.

 

[TESL@]

Thank you Astronuc.