Question
(a) Silicon-30 \((_{14}^{30}\) Si) can be formed from phosphorus-30 \((_{15}^{30}\) P) by a process of beta-plus decay.
(i) Write down the nuclear equation that represents this reaction. [2]
(ii) Sketch the Feynman diagram that represents this reaction. The diagram has been started for you. [3]
(iii) Energy is transferred to a hadron in an attempt to separate its quarks. Describe the implications of quark confinement for this situation. [2]
(b) The Standard Model was accepted by many scientists before the observation of the Higgs boson was made.
Outline why it is important to continue research into a topic once a scientific model has been accepted by the scientific community. [1]
Answer/Explanation
Ans:
a i ++10e + νe
a ii 
a iii quarks cannot be directly observed as free particles/must remain bound to other quarks/quarks cannot be isolated because energy given to nucleon creates other particles rather than freeing quarks/OWTTE
b models need testing/new information may change models/new technology may bring new information/Models can be revised/OWTTE