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What is the optimum geometry for the Rutherford Backscattering Spectroscopy experiment? And using this optimum geometry,...

What is the optimum geometry for the Rutherford Backscattering Spectroscopy experiment? And using this optimum geometry, a 2 MeV 4He2+ beam is directed towards a target and backscattered 4He2+ are detected at 0.7071 MeV energy. What was the target material?
Science   Advanced-Physics   
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so the mass of target material is 10u

For backscatter theta is 180

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