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# Physics (P3) Quarks and Decay. Help?

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Why bother with a post grad course - waste of time? 17-10-2016
1. During beta plus decay does a proton turn into a neutron and then a positron in released?

And in terms of quarks the neutron would be: down down up and the proton would be: up up down? Giving them both 1 mass (1/3 x 3) and the proton a +1 charge (2/3 - 1/3 +2/3) = 1 and the neutron would be (- 1/3 - 1/3 + 2/3) = 0 ?

And during the decay is the positron released due to the conservation of charge before and after the reaction and an up quark is changed to a down?

Thanks!
2. Yes in beta-plus decay a proton gets changed into a neutron (so the proton number of the element decreases by one and its nucleon number stays the same) and a beta-plus particle is emitted (positron) to conserve charge (+1--->0+1+0) a neutrino is also emitted (though I'm not sure if you need to know this) to conserve lepton number.

You're right about the quarks. You could write beta-plus decay in terms of an up quark decaying into a down quark, a positron and a neutrino.
3. (Original post by victoria98)
Yes in beta-plus decay a proton gets changed into a neutron (so the proton number of the element decreases by one and its nucleon number stays the same) and a beta-plus particle is emitted (positron) to conserve charge (+1--->0+1+0) a neutrino is also emitted (though I'm not sure if you need to know this) to conserve lepton number.

You're right about the quarks. You could write beta-plus decay in terms of an up quark decaying into a down quark, a positron and a neutrino.
THANK YOU SO MUCHHH!!!! wow thank you ahaha, i dont need to know about neutrinos (i wish we did at gcse )

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