Estimation of electron, pion and positron rates

Results of calculations are listed in Table 10.

Table 10: Simulation for E99-117

kine #	1	2	3
$p_e$(GeV/c)	1.455	1.72	1.32
$\theta_e$	45$^\circ$	35$^\circ$	35$^\circ$
$\pi^-$(epc)	55.6	92.6	749.8
$\pi^-$(epcv)	259.1	234.6	291.0
$\pi^-$(wiser)	4.520	11.96	98.42
$e^-$(qfs)	1.700	6.274	9.759
$e^-$(whitlow)	0.875	4.053	7.102
$e^-$(rosetail)	0.012	0.043	0.195
$e^-$(rosetail, new window)	0.013	0.043	0.026
$e^+$(epc)	0.0047	0.0057	0.0086
$e^+$(wiser)	0.0158	0.114	1.11
$\pi^-/e^-$(estimation)	$\sim$10	$\sim$20	$\sim$100
$e^+/e^-$(estimation)	$\sim$ 0.2%	$\sim$ 0.5%	$\sim$ 3%

$\star$ The radiation length for 25 cm $^3$He target is:
before interaction:
10 mil Be + 10 mil Al + 0.012 mm Pyrex + 20 cm Air + 25 cm/2 $^3$He (10atm) = 0.3574%
after interaction:
25 cm/2 $^3$He (10atm) + 10 mil Al + 1.4 mm Pyrex + 20 cm Air + 7 mil Kapton + 4 mil Ti = 1.673%