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## Homework Statement

I am wondering about something:

Calculate the Fermi energy for the neutrons confined to a nucleus with 40 protons and 50 neutrons which roughly forms a sphere of radius 4.6 10^(-15) m.

## Homework Equations

the formula of the fermi Energy is EF= ((h-bar)^2*(3*pi^2*n)^(2/3))/2m

m:mass of electron, n = number density of electron

## The Attempt at a Solution

Then, in the problem we are given protons and neutrons. Where does influence the formula? and where do we use the radius there is one relation that is n = N/V ( N= protons+Neutrons)

and V is the volume of the sphere.

is it right?

Also, do we use the mass of electron or the mass of proton = neutron this time?