Subject: What happens in neutrino antineutrino annihilation ?

What happens in neutrino antineutrino annihilation ? Neutrinos are absorbed by 
atoms only extremely rarely So I'm thinking would't it be far easier to detect 
neutrinos by annihilating them ? As far as I know fusion reactions (like in 
the Sun) create neutrinos and fission reactions (like in fission reactors) 
create antineutrinos (although I could be wrong and its the other way around). 
Should't it be possible to detect the Sun's neutrinos using the antineutrinos 
of one of our earthbound nuclear reactors ? What would be the particles 
produced in this annihilation ? Shouldn't they be far easier to detect than 
the neutrinos and antineutrinos themselves ? A related question is would you 
please explain the current controversy over whether there even exists any 
distinction between neutrinios and antineutrinos (some claim they are the same 
particle), has this been settled experimentally or not ? Thanks a lot !

Re: What happens in neutrino antineutrino annihilation ?