- #1
j-lee00
- 95
- 0
original question
Assume that the density of dark matter near the Earth is 0.3 GeV / cm3 and that the dark matter particle has a mass of 100 GeV and a velocity of 200 km/s. If the dark matter-nucleon cross section is 10^-44cm2 calculate how many events you would expect to see every year in a metre cubed volume of Xenon at room temperature.
I have worked out that
1) density of dark matter particles near Earth is 3 particles per m^3
2) the flux of the dark matter 6 * 10^5 m^-2 s^-1 passing through a m^3 of Xe
3) that there are 1.668 *10^25 particles in a m^3 of xenon
if the the cross section of dark matter 10^-44 cm^2
How do i work out the number of collisions per second?
Assume that the density of dark matter near the Earth is 0.3 GeV / cm3 and that the dark matter particle has a mass of 100 GeV and a velocity of 200 km/s. If the dark matter-nucleon cross section is 10^-44cm2 calculate how many events you would expect to see every year in a metre cubed volume of Xenon at room temperature.
I have worked out that
1) density of dark matter particles near Earth is 3 particles per m^3
2) the flux of the dark matter 6 * 10^5 m^-2 s^-1 passing through a m^3 of Xe
3) that there are 1.668 *10^25 particles in a m^3 of xenon
if the the cross section of dark matter 10^-44 cm^2
How do i work out the number of collisions per second?
Last edited: