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**J**(

**Ω**) = ∫n(Ω)v

**Ω**dΩ

This is a neutron current question. It wants me to figure out the net neutron flux (and direction) through a unit area of the xy plane. It gives an equation for n(Ω) = (1/4π)(1-cosθ), but I am trying to figure out what

**Ω**is inside the intergrand because that is where the direction comes from.

I know it is the unit vector, but what is it?? Since I am integrating over a solid angle, the vector should be in spherical coordinate notation? I feel like I should know this, but I am just confusing myself in the process of figuring it out.

Any help is appreciated!

n(Ω) - expected neutron density

v - neutron speed - 2200m/s

dΩ - solid angle

DM