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Question How to increase efficent of Rutherford Backscattering 

Forum: Biasing and Scoring
Date: 18 Feb, 2012
From: wangzhenchao <wangzhenchao>

Hello everyone 
 I'm simulate alphai2MeVj Backscattering on thin target of gold .
 I'm interested in energy spectrum at backward angles i160-170 degreejconcerning the Coulombscattering alpha . Because of the thin target I have only a few events in my detector (~100 at an event rate of 10^8). 
So some kind of cross section biasing seems to be necessary. Most of the alpha  are scattered in forward direction (>95% are scattered in an angular range of 0-5 degrees). 
So in case of alpha  scattering "angular biasing" is maybe a good idea that means increasing the cross section for elastic alpha scattering at backward angles relative to the cross section for forward angles by several orders of magnitude. 
What is the best way to achieve this or someone have other ideas to increase efficent ? Has anyone tried something similar? 

Thanks for your helps !

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