The strong nuclear force doesn't cause a neutron to change into a proton in β decay, or a proton to change into a neutron in β decay. These changes can't be due to the electromagnetic force, as the neutron is uncharged. There is a different force that must be weaker than the strong nuclear force, otherwise it would affect stable nuclei, so it is the 'weak nuclear force'.
In both β and β decay, a new particle and antiparticle are created in each type of decay - but they are not a corresponding particle-antiparticle pair as one is an e or a e and the other is a neutrino or an antineutrino.
- A neutrino can interact with a neutron and change it into a proton. A β particle (an e ) is created and emitted as a result of the change.
- An antineutrino can interact with a proton and make it change into a neutron. A β particle (an e ) is created and emitted as a result of the change.
These interactions are due to the exchange of particles referred to as 'W bosons'. Unlike photons, these exchange particles:
- Have a non-zero rest mass
- Have a very short range (no more than about 0.001fm)
- Are positively charged or negatively charged (W boson)
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