What happens when proton and a neutron fuse together?

Question: What happens when proton and a neutron fuse together?
- Keywords:
  atom,
  neutron,
  proton
Asked by to Nick on 13 Mar 2014. This question was also asked by .
- Nick Goldman answered on 13 Mar 2014:
  
  I don’t know, I’m afraid, that’s not my field. Try me on computers, maths or biology!

Question: What happens when proton and a neutron fuse together?