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Energy in nuclear reactions

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by

Richard Datwyler

on 28 March 2017

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Transcript of Energy in nuclear reactions

Energy in nuclear reactions
Not only is the KE conserved but the momentum must be conserved too. (shown here in simplified case)
The energy that is released in nuclear reaction comes from mass defect in the reaction.
Often nuclear reaction require an incoming particle hitting a parent nuclei, then it releases a daughter(s) and an outgoing particle.
a + X Y + b
As well the amount of initial KE that is sometimes used to start the reaction must be conserved.
If the incident proton has a KE of 3.1 MeV what is the total KE of the products of the following reaction
p + Li He + alpha
3
7
2
4

1.007276 u
7.016003 u
4.002603 u
16.83 MeV
19.93 MeV
Radon is unstable and has a half life of 3.8 days. If one radon decays via alpha particle, how fast is each fission product moving?
Rn Po + alpha
222
222.017578 u
218.008973 u
4.002603 u
84
218
86
5.59 MeV
.05 c
300 km/s
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