Act_12 - 12/12/05 Name _ Section _ Activity 12: Energy from...

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12/12/05 77 Name _________________________ Section ___________________ Activity 12: Energy from Nuclear Reactions 12.1 A Model of the Composition of Nucleons 1) Formation of Nucleons Nucleons consist of quark trios. a) Place orange or green “quarks” into the metal “nucleon” or “gluon cloud” to represent a proton. Draw a diagram showing the quarks in the proton. b) Flip one of the “quarks” in the metal “gluon cloud” to represent a neutron. Make sure the spin of the neutron points in the same direction as the spin of the proton. Draw a diagram showing the quarks in the neutron. c) Which of the four fundamental forces is involved in binding quarks into nucleons? d) The exchange of which type of gauge boson is responsible for binding quarks into nucleons?
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12/12/05 78 12.2 A Model of Beta Decay 2) Feynman Diagram of a Beta Decay Beta decays, in which a neutron changes into a proton or a proton changes into a neutron, can be represented by a Feynman diagram. a) Place the appropriate orange and green quarks into the gluon cloud to form the nucleon shown at Time 1. Which type of nucleon is this? ___________ b) Flip the appropriate quark to form the nucleon at Time 2. Which type of nucleon is this? ________________ c) Open the black plastic box that correctly completes this reaction. Which box is this? ________________ d) Is an electron or an antielectron emitted? Why? e) Is a neutrino or antineutrino emitted? Why? f) Write the nuclear reaction illustrated by this Feynman diagram. g)
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Act_12 - 12/12/05 Name _ Section _ Activity 12: Energy from...

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