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None Re: Proton behaves strange in scintillating calorimeter 

Forum: Hadronic Processes
Re: None Proton behaves strange in scintillating calorimeter (Josh Xie)
Re: None Re: Proton behaves strange in scintillating calorimeter (Dennis H. Wright)
Date: 13 Aug, 2013
From: Josh Xie <Josh Xie>

Hi Dennis,

Thank you so much for answering my question!

On Tue, 13 Aug 2013 21:49:37 GMT, Dennis H. Wright wrote:

> Not knowing the structure of your calorimeter, my guess would be that
> the protons, in addition to creating a lot of scintillation light in the
> first few layers, will interact hadronically, producing other hadrons
> like neutrons and pions which will make it to the deeper layers and
> cause more scintillation there.
> 
> The pi0 will convert quickly to gammas and, like electrons, produce an
> EM shower with relatively few particles penetrating to the deeper
> layers.
> 
> In short, perhaps what you are seeing is reasonable.
> 

The structure is simple: The calorimeter is composed by 20 layers, each layer contain one thin scintillating glass layer and one iron inter layer. The iron layer will absorb the energy of incoming particle.

> my guess would be that
> the protons, in addition to creating a lot of scintillation light in the
> first few layers, will interact hadronically, producing other hadrons
> like neutrons and pions which will make it to the deeper layers and
> cause more scintillation there.

Maybe you are right, the hadronic interaction created more particles that would be stopped in different layers. When I run 1000 events, and normalize the result, I got a different graph(see attached). For shooting 1000 photons, the small peaks in the tail of graph are gone.

Based on above extra information, can you come up more explanations?

Josh

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