Understanding Energy in Annihilation: Proton-Antiproton vs. Neutron-Antineutron

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DaveSmith
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Hi there guys, this is my first post
I've just completed my first couple of semesters in BS in Applied physics, and Annihilation really amazes me, My question is

The proton antiproton annihilation at rest releases some 1.88 GeV energy
http://www.fnal.gov/pub/inquiring/questions/antimatter1.html

But does neutron antineutron annihilation releases 1.8 GeV energy overall or with each of the two photons it produces have 1.8 GeV energy?

http://en.wikipedia.org/wiki/Neutron-antineutron_annihilation
 
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The energy released by proton antiproton annihilation or neutron antineutron annihilation goes into the energy of particles that are produced in the final state. The two photon decay is rare. Most of the time the final particles are mesons.
 
Yes but can you refer to the wikipedia link I've given and narrate the energy release part in neutron-antineutron annihilation? Is it 1.8 GeV overall or with each of the two photons releasing 1.8 GeV separately?
 
Meir Achuz said:
The energy released by proton antiproton annihilation or neutron antineutron annihilation goes into the energy of particles that are produced in the final state. The two photon decay is rare. Most of the time the final particles are mesons.

So you'd have rapid decay to electrons, photons, and neutrinos... or just photons and electrons?
 
DaveSmith said:
Yes but can you refer to the wikipedia link I've given and narrate the energy release part in neutron-antineutron annihilation? Is it 1.8 GeV overall or with each of the two photons releasing 1.8 GeV separately?
It is 1.8 GeV overall, which is the rest energy of two nucleons.
 
nismaratwork said:
So you'd have rapid decay to electrons, photons, and neutrinos... or just photons and electrons?
The rapid decay is mostly to pi mesons.
 
Meir Achuz said:
The rapid decay is mostly to pi mesons.

Ooooh... right. OK, I can take pion decay from there... thanks Meir Achuz!
 

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