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Effect of Neutrons on Plastic Scintillating Material in the Mu2e Cosmic Ray Veto Shield

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Amy Allen

on 28 April 2010

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Transcript of Effect of Neutrons on Plastic Scintillating Material in the Mu2e Cosmic Ray Veto Shield

Effect of Neutrons on Plastic
Scintillating Material in the Mu2e Cosmic
Ray Veto Shield amy allen, IMSA
doug glenzinski, Fermilab
craig group, Fermilab
halley brown, Fermilab What is the Mu2e Experiment? Mu2e is a search for neutrino-less muon (µ) to electron (e) conversion in the coulomb field of the nucleus
Mu2e proposes a new detector with superior sensitivity to interact with a beam of slow muons.

Mu2e is expected to reach a sensitivity approximately 10,000 times greater than any current limits.
Why is Mu2e Important? is a Charged Lepton Flavor Violation (CLFV) decay. CLFV decays are highly suppressed in the SM and remain virtually
unobserved Any observation of this decay would indicate that the Standard Model (SM) remains incomplete. Cosmic Rays What is the Cosmic Ray Veto Shield? What is a Scintillator? Focusing Question: What effect do neutrons have on plastic scintillating material? The CRV Teststand @ Fermilab Test #1: Does the Neutron Source
have an effect on the trigger rate? Californium 252 source was placed directly on the trigger panel
YES! To our surprise, the trigger rate increased from about 2.4event/sec to 18.90 events/sec! That is almost 8 times as many!

Conclusion: We need to do more tests.
So we studied up! Analysis Methods and Trigger Formations 1in-4in of Al Beneath the source
Results Runs with Al on sides to test if alpha and betas are escaping over the sides of the trigger Another Trigger Formation Trial vs. Rate (events/sec) Experimental Uncertainty Future Testing University of Chicago Neutron Source

Allows us to measure the amount of neutrons
Allows us to have a more pure neutron source
Craig Group and Doug Glenzinski and Halley Brown, Fermi National Accelerator Lab Laboratory, CDF
SIR Program
Judy Scheppler, IMSA
Acknowledgements Cary, R.M., Lynch, K.R. , Marciano, W., & Kolomensky, Y. . (2008). Proposal to Search for Muon to Electron Conversion with a Single Event Sensitivity Below 10^16. Batavia, IL: Fermilab.
Dukes , E. (2008). 10th International Workshop on Neutrino Factories Seminar . Retrieved from http://mu2e-docdb.fnal.gov/cgi-bin/ShowDocument?docid=247
Griffin, N. (1996). Beta particles. Retrieved from http://trshare.triumf.ca/~safety/EHS/rpt/rpt_2/node23.html
Mu2e Collaboration, . (2007). Letter of Intent A Muon to Electron Conversion Experiment at Fermilab. Batavia, IL: Fermilab.
Open source radiation safety training module 1: radiation properties. (2006). Retrieved from http://web.princeton.edu/sites/ehs/osradtraining/radiationproperties/radiationproperties.htm#alpha
Preybs, E. (Ed.). (2008). A Muon to electron experiment at fermilab. Batavia, IL: Fermi National Acclerator Laboratory.
(2009). Cosmic Ray Work Group. Retrieved from http://mu2e.fnal.gov/public/hep/workgroups/CosmicRayVeto/status.shtml
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