Introduction of research project
Solidification of casting alloys
Stresses and strains
Analysis of data
Wavelength about 2 Å
Go through several cm of Al
◦ Wrong wavelength, absorbed
◦ Wavelength OK, strongly absorbed
◦ Wavelength OK, very strongly absorbed
(penetrate less than a mm)
◦ Wavelength OK, able to pass through many
cm of Al
We chose neutrons
Discovered in 1932
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
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
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.
…how do we design an experiment