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Remarks on the Mu2e Cosmic Ray Veto Counters

Remarks on the Mu2e Cosmic Ray Veto Counters. Peter Yamin, BNL. Cosmic Rays  μ s at Surface. Swiped from PDG article by T.K. Gaisser and T. Stanev, Phys. Lett. B., 667, (254), 2008. Underground…. Underground, cont’d. Integrating,. , where.

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Remarks on the Mu2e Cosmic Ray Veto Counters

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  1. Remarks on the Mu2e Cosmic Ray Veto Counters Peter Yamin, BNL

  2. Cosmic Raysμs at Surface Swiped from PDG article by T.K. Gaisser and T. Stanev, Phys. Lett. B., 667, (254), 2008. CRV @ LBNL, P. Yamin

  3. Underground… CRV @ LBNL, P. Yamin

  4. Underground, cont’d Integrating, , where and Eμ,0 is energy of muon at production and Eμ its energy After traversing X grams of rock. For X<<b-1 ≈ 2.5 km water equivalent, Eμ,0 ≈ Eμ(X) + aX CRV @ LBNL, P. Yamin

  5. Underground, cont’d Milind Diwan coded this and produced, for standard rock. (This was included in our proposal) CRV @ LBNL, P. Yamin

  6. Underground, cont’d Conclusion: we need not perform a detailed simulation of cosmic ray interactions in the upper atmosphere; we can rely on the Gaisser parameterization of muons at surface and dE/dX ≈ constant at shallow depths. But CRV @ LBNL, P. Yamin

  7. Backgounds in the Veto Counters A MARS model: Pb Al CH2 Fe CRV @ LBNL, P. Yamin

  8. Backgrounds, cont’d. E vs. Z in Inner CRV For 2.5 x 1011 incident μ- CRV @ LBNL, P. Yamin

  9. Backgrounds, cont’d. Neutrons could present a background problem. CRV @ LBNL, P. Yamin

  10. Conclusions: Thermal neutrons from muon stopping target could present a background problem in Cosmic Ray Veto Counters. Ambient background from Production Target not yet been simulated and could introduce additional background. Test Cosmic Ray Veto Counter efficiency in region of high thermal neutron flux CRV @ LBNL, P. Yamin

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