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PARTICLE PHYSICS
PARTICLE PHYSICS n Particle physics 11.1. Atoms, nuclei and radiation Candidates should be able to: 1 infer from the results of the a.-particle scattering experiment the existence and small size of the nucleus 2 describe a simple model for the nuclear atom to include protons, neutrons and orbital electrons 3 distinguish between nucleon number and proton number 4 understand that isotopes are forms of the same element with different numbers of neutrons in their nuclei 5 understand and use the notation 5x for the representation of nuclides 6 understand that nucleon number and charge are conserved in nuclear processes 7 describe the composition, mass and charge of a.-, B- and y-radiations (both B” (electrons) and B* (positrons) are included) 8 understand that an antiparticle has the same mass but opposite charge to the corresponding particle, and that a positron is the antiparticle of an electron 9 state that (electron) antineutrinos are produced during fs decay and (electron) neutrinos are produced during B* decay 10 understand that o-particles have discrete energies but that B-particles have a continuous range of energies because (anti)neutrinos are emitted in B-decay nN represent ot- and B-decay by a radioactive decay equation of the form 2SU = oATh tha 12 use the unified atomic mass unit (u) as a unit of mass wd | Getao,-Marsden ha particle ” iment: Signifance: dy Smoller sigg of nuclens|vi 1}. wa Gi) Greater rears oP ructbus}mt? —“* Thete w a dose nucleus & present inside an atom. W a wmnassive pocticla amd deg net Show anny daflodiion dua te aibiting, 
