assign10 - Calculate the least positive invariant...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 5110 Homework 10 (due Apr 2) March 30, 2010 1. Williams, problem 9.3. 2. Williams, problem 9.4. 3. A moving particle has a longer mean life ( τ ) than a resting particle ( τ 0 ), according to τ = γτ 0 . Calculate the lifetime (years) of a very high energy cosmic ray neutron of total energy 10 20 eV . (Hint: use the Lorentz transformation to go from the particle rest frame to the moving frame to Fnd the relationship between γ , E , and mc 2 .) Such neutrons might survive the journey from distant galaxies. 4. (a) A neutron decays at rest to a proton plus electron and neutrino.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Calculate the least positive invariant four-momentum transfer from the neutron to the proton. (Hint:the least positive value comes when the electron is at rest.) (b) Draw a eynman diagram representing the decay process, showing the appropriate vector boson. (c) Draw a eynman diagram for the scattering of an electron-type-neutrino from a neutron, resulting in an electron and a protron, showing the appropriate vector boson. 1...
View Full Document

This note was uploaded on 07/12/2010 for the course PHYSICS 5010 taught by Professor Rosenthaal during the Spring '10 term at University of Utah.

Ask a homework question - tutors are online