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
   

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