(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The nuclear reaction [tex]^63_29[/tex]Cu(p,n) [tex]^63_30[/tex]Zn is immeadiately followed by [tex]/Beta^+[/tex]. Write the equation for this [tex]/Beta^+[/tex] decay.

If the maximum energy of the positrons is 2.36 MeV, find the Q value of the original (p,n) reaction.

2. Relevant equations

[tex]Q=[M(A,Z) - M(A,Z-1) -2m_e]c^2[/tex]

3. The attempt at a solution

Decay chain:

First: Copper + proton ---> Zinc + neutron

Second: Zinc ---> Copper + positron + neutrino

So Zinc can be substituted into the first equation to give that:

proton ---> neutron + positron + neutrino

Now I get confused. I pulled the above equation from my notes, and I know that its the energy of the system, but other than that I don't understand.

I've spoken to my lecturer about it, but he didn't make much sense with it so I'm hoping one of you could help me better with it.

As I understand it [tex]Q_{tot} = Q_1 + Q_2[/tex] where Q_2 is the second decay, given by the previous equation, but can be assumed to be the max KE of the positrons (as the neutrion is massless etc). But then I get stuck, as I can't see how I'd find the total energy of the system, much less the energy of the original (p,n) reaction.

Could someone point me in the right direction?

Thanks

Brewer

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Beta plus decay

**Physics Forums | Science Articles, Homework Help, Discussion**