Back Entering e+ - soft shower into Tracker from below Albedo Gamma (rocking)?

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Presentation transcript:

Back Entering e+ - soft shower into Tracker from below Albedo Gamma (rocking)?

e+ enters backside – spacecraft interaction – shower into LAT Side / Corner entering e+ Scintillator

Back Side Entering Gamma Showers into Tracker Side entering stopping proton

Proton from below stops in tracker Corner Crossing e+ Side Row Scintillator X Y Y Z

Incoming Proton – makes no sense ???? Found Track (Typ. both views XZ, YZ) Top View XY Found Track due to a 2 nd Particle?? e+ Interaction in the space craft Produces 85 MeV  hitting Cal backside. Shower Frags. create Tracker track

11 Gev proton interaction in blanket – makes 250 MeV  MeV e+ annihilates in blanket - one  converts, the other plows into Cal.

Side entering albedo  low energy – direction unreconstructable Back side entering  (367 MeV) Shower boil-out gives track

Alpha Particle – straight through The Corner There are a surprizing number of Alpha/Heavy Ions in the residuals