PbBi Target Optimization

PbBi Target Thickness Optimization

10 MeV electrons incident on a thin layer of PbBi target. A detector is placed on the back of the target to detect positrons.

It was found that 2.0 mm thick PbBi yields highest e+/e- ratio of 9.8/10000.

     Pb-Bi 	  e+ Detected on the 	      Positrons        electrons 
     Target        Back of Target            Detected         incident
    Thickness          Per e-
      (mm)			
	0.1		1.52E-05		152		1.00E+07
	0.2		5.49E-05		549		1.00E+07
	0.3		1.04E-04		1041		1.00E+07
	0.4		1.71E-04		1710		1.00E+07
	0.5		2.40E-04		2399		1.00E+07
	0.8		4.76E-04		4763		1.00E+07
	1		6.35E-04		6348		1.00E+07
	1.5		9.09E-04		9090		1.00E+07
	1.7		9.58E-04		9584		1.00E+07
	1.9		9.68E-04		9676		1.00E+07
	1.95		9.71E-04		97075		1.00E+08
	2		9.80E-04		97997		1.00E+08
	2.05		9.72E-04		97153		1.00E+08
	2.1		9.66E-04		96632		1.00E+08
	2.3		9.60E-04		96020		1.00E+08
	2		9.84E-04		9840		1.00E+07
	2.05		9.38E-04		9380		1.00E+07
	2.1		9.68E-04		9675		1.00E+07
	2.3		9.75E-04		9746		1.00E+07
	2.5		9.49E-04		9489		1.00E+07
	3		9.00E-04		9002		1.00E+07
	4		8.36E-04		8364		1.00E+07
	6		7.00E-04		7003		1.00E+07
	8		6.53E-04		6526		1.00E+07
	10		5.58E-04		5578		1.00E+07
	15		4.07E-04		4067		1.00E+07
	20		3.03E-04		3033		1.00E+07
	30		1.61E-04		1608		1.00E+07
	50		1.45E-04		1447		1.00E+07