Act12_sol - 12/12/05 Activity 12 Solutions: Energy from...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
12/12/05 1 Activity 12 Solutions: 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? the strong nuclear force d) The exchange of which type of gauge boson is responsible for binding quarks into nucleons? the gluon d u u d u d d u d OR OR d u u
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12/12/05 2 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? a proton b) Flip the appropriate quark to form the nucleon at Time 2. Which type of nucleon is this? a neutron c) Open the black plastic box that correctly completes this reaction. Which box is this? beta plus decay d) Is an electron or an antielectron emitted? Why? A positive antielectron is emitted to satisfy conservation of electric charge (+1 charge on each side of the reaction) e) Is a neutrino or antineutrino emitted? Why? Since particles are emitted in matter-antimatter pairs, a neutrino is emitted with an antielectron. f) Write the nuclear reaction illustrated by this Feynman diagram. energy e n p o o o 1 1 0 1 1 + ν + + + g) Which of the four fundamental forces is responsible for beta decay? the weak nuclear force h) Which type of boson is responsible for beta plus decay? a W + boson i) Group Discussion Question: What changes occur in the identity of the quark trio making up the nucleus when a proton becomes a neutron? Why? d u u d u d ? ? boson ? Time 1 Time 2
Background image of page 2
12/12/05 3 3) Summary of beta decay Fill in the table below to summarize the discussion of beta decay. Decay Nucleon change Quark change Particles emitted Force involved Gauge boson beta-plus ( β + ) Proton into a neutron Up quark into a down quark Antielectron and neutrino Weak W + beta-minus ( β ) Neutron into a proton Down quark into up quark Electron and antineutrino Weak W 12.3 How Are Nucleons Bound into Nuclei? 4) Pions
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/11/2011 for the course PHYSICS 104 taught by Professor Staff during the Winter '11 term at Ohio State.

Page1 / 8

Act12_sol - 12/12/05 Activity 12 Solutions: Energy from...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online