The neutron drip line is defined to be the point at which the neutron separation energy for

Question:

The neutron drip line is defined to be the point at which the neutron separation energy for any isotope of an element is negative. That is, the neutron is unbound. Using the Bethe-Weizsacker formula, find the neutron drip line for the element Sn. Find this value using Sn and S2n. Plot both Sn and S2n / 2 as a function of neutron number.