# Exercise 4.1-1

# Lifetime of Positrons

| Show that the solution of the differential equations for the positron concentrations n1 and n2
dn1 dt | = | – (l1 + n · cV) · n1
--- | --- | ---
dn2 dt | = | – l2 · n2 + n · cV · n1
|  | leads to the following formula for the average lifetime
t | = t1 · | æ ç è | 1 + t2 · n · cV 1 + t1 · n · cV | ö ÷ ø
| Link to the Solution

With frame

4.1.1 Experimental Techniques for Studying Point Defects

Solution to Exercise 4.2-1

Solution to Exercise 4.1-1

© H. Föll (Defects - Script)