Docstoc

INTRODUCTION TO THE DRSA Inreach - 2012 - moorsscience

Document Sample
INTRODUCTION TO THE DRSA Inreach - 2012 - moorsscience Powered By Docstoc
					   Introduction of research project
   Solidification of casting alloys
   Stresses and strains
   Crystal lattices
   Diffraction
   Neutrons
   Experimental design
   Data
   Analysis of data
 Wavelength about 2 Å
 Go through several cm of Al
   Light
    ◦ Wrong wavelength, absorbed
   X-rays
    ◦ Wavelength OK, strongly absorbed
   Electrons
    ◦ Wavelength OK, very strongly absorbed
      (penetrate less than a mm)
   Neutrons
    ◦ Wavelength OK, able to pass through many
      cm of Al
   We chose neutrons
   Subatomic particle
   Discovered in 1932
   Electrically neutral
   With protons, they form nuclei
   Stable in the nucleus
   Unstable when free, half-life 10 minutes and 11
    seconds when free, beta decay (neutron turns into
    a proton, electron and electron antineutrino)
   Able to penetrate matter because electrically
    neutral
   About the same mass as a proton
   Fuel is metallic composite containing uranium
    enriched in U235
   U235 is a fissile isotope of uranium
   So what does fissile mean?
   So answer the question, what makes the reactor
    go?
   A chain reaction…
   Then what’s all the water in there for?
   Neutrons ejected from fission are going too fast for
    U235 nuclei to capture them.
   The water slows them down.
Reactor   Sample
 …how do we design an experiment
using neutrons

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:4
posted:6/17/2013
language:
pages:19