Particle Physics Questions that involve Feynman Diagrams
Q3.
decays, forming a new nucleus, by releasing a
particle and one other particle which is difficult to detect.
(a) Name the particle which is difficult to detect. (1 mark)
neutrino ![](../../../graphics/symbols/nuclides/ticksmall.png)
(b) Write down the proton number and the nucleon number of the new nucleus. (clearly indicate which is which!) (2 marks)
proton number = 10 ![](../../../graphics/symbols/nuclides/ticksmall.png)
nucleon number = 22 ![](../../../graphics/symbols/nuclides/ticksmall.png)
(c) Name the baryon and each of the leptons (clearly indicate which is a baryon and which is a lepton) formed as a result of this decay. (3 marks)
baryon = neutron ![](../../../graphics/symbols/nuclides/ticksmall.png)
lepton = positron ![](../../../graphics/symbols/nuclides/ticksmall.png)
lepton = (electron) neutrino ![](../../../graphics/symbols/nuclides/ticksmall.png)
(d) Give the quark structure for
(i) a neutron and udd ![](../../../graphics/symbols/nuclides/ticksmall.png)
(ii) a proton. uud ![](../../../graphics/symbols/nuclides/ticksmall.png)
(1 mark)
(e) Complete the following Feynman diagram so that it represents
decay.
![](5A.png)
(3 marks)
(Total 10 Marks)