lecture_5_F11 - Physics 433 Lecture 5 Review Next week and...

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Physics 433 - Lecture 5 Next week and following weeks we will have several experiments set up in the lab Compton Scattering Proportional Counters and Tubes Muon Lifetime (data taking for entire week) Drift velocity of electrons in a constant electric field Thursday and Friday labs will cycle through Compton Scattering, proportional tubes, drift velocity in gases and muon life time measurements In lab we will assign a letter to your group so that I can inform you of each week’s lab in time for you to read the lab instruction sheet before coming to lab Friday November 11 is a holiday so the Friday lab will have a lab on December 2. The week of December 5 will be the last week to complete a missed lab October 27, 2011 Henry Lubatti 1 Review
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October 27, 2011 Henry Lubatti Physics 433 – Lecture 5 Cross section continued Incident beam (N i /unit vol.) is spread over area A > target Probability that a particle interacts in distance dx is given by N i Adx/A = N i dx = N s /N i , where N s and N i are the number of scattered and incident particles, respectively As defined, is the total cross section; if the beam area is less than area of target, A is the area covered by beam Differential cross section gives the probability of a particle scattering into a solid angle ( Ω ) per unit time, which introduces the concept of flux Flux, F, equals particles per unit area per unit time Because this is a random process we average over many different measuring periods and obtain a fixed differential cross section d /d (E, ) = (1/F)dN s /d  where N s is number scattered/time and FA = N i gives the incident particles per unit time Total cross section is obtained by integrating over 4 Mean free path is mean distance between collisions = 1/ N 2 Review
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October 27, 2011 Henry Lubatti Physics 433 - Lecture 5
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