The Big Bang should have produced equal amounts of matter and antimatter if CP-symmetry was preserved; as such, there should have been total cancellation of both protons should have cancelled with antiprotons, electrons with positrons, neutrons with antineutrons, and so on.
22.
The debris contains particles such as pions and kaons, which are made of a quark and an antiquark; protons and neutrons, made of three quarks; and even copious antiprotons and antineutrons, which may combine to form the nuclei of antiatoms as heavy as helium.
23.
If a neutron and antineutron collide then "'all "'the mass will be converted to energy, but lots of energy from velocity will also be converted to mass and photons, just like in the first situation . talk ) 02 : 26, 15 February 2008 ( UTC)
24.
How efficient would the collision of two neutrons traveling at 100 % 99 % the speed of light in total conversion of mass to energy be compared to the total conversion of mass to energy in the colliding ( at any speed ) of a neutron and an antineutron ? talk ) 01 : 33, 15 February 2008 ( UTC)
