Don't know if this is what you are looking for but: neutrons (free) are unstable particles. They will decay after a certain time into a proton emitting a beta particle. To my knowledge, there are no electromagnetic photons emitted from this disintegration though.
what about when a neutron and an anti-neutron collide and then photons are emitted.
And lets say I had a ball oh neutrons and I heated them with a torch or had them in the presence of an alternating magnetic field , what about a neutron star.
Oh boy. The collision of matter and anti-matter is not consider photon emission by the particle itself. The particle anhilate and emit energy through this process.
If you want, the disintegration by a beta particle is always accompanied by the emission of a neutrino type particle. This neutrino will carry some of the energy of the disintegration. But then again, the neutrino is not a electromagnetic photon (unless considering the duality principle).
I was hesitating to jump in because it's a bit a tricky issue. As the neutron has a magnetic moment, it thus can interact through the electromagnetic field, and as such, one should say that it can "emit (virtual) photons" ; that is, you can link a neutron in a Feynman diagram with a photon, although this is somewhat messy as it isn't directly charged.
However, if you mean real photons, such as emissions of gamma radiation, then no. Of course, you can think of the quarks inside the neutron as a bound state, and think of exciting those. But then it is not a neutron anymore ! The neutron is a bound state of down-down-up. There exist other such states, for instance the Delta-0 particle. You could consider it as an "excited" neutron state if you which. See for instance the Wiki article on it: http://en.wikipedia.org/wiki/Isospin
You see the neutron in the left-upper corner of the baryon octet spin-1/2 and the Delta-0 baryon second from the left in the upper row of the baryon decuplet spin-3/2.
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