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Question Meaning of PreStepPoint kinetic energy? 

Forum: Event and Track Management
Date: 03 Dec, 2012
From: Jérôme Roccaz <Jérôme Roccaz>

Hi everyone,

I study secondaries generated by interactions of incident particules like photons, ions and electrons on pure aluminium.

In my output I print : Ekin = aStep->GetTrack()->GetKineticEnergy() PreEkin = aStep->GetPreStepPoint()->GetKineticEnergy() PostEkin = aStep->GetPostStepPoint()->GetKineticEnergy()

I histogram PreEkin for these secondaries and obtain peaks at low energy (< 10 keV) and continuum. Peaks are generated by electrons, mainly created by ionization of incident particules on aluminium.

One of my aim is to identify these peaks in order to be sure they are physically realistic. To do so I use the following data base : http://physics.nist.gov/PhysRefData/ASD/levels_form.html.

Some of the peaks I have in the spectrum do not match with these data. Electronic levels that could match are too close the aluminium nucleus to be excited by ionization.

To investigated I've histogrammed the corresponding Ekin and PostEkin ... and these energies for these PreEkin peaks are null.

What is the meaning of that? Excitation of electrons that do not leave the atom? Other physical thing? Or a huge error in my programm?

thanks,

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1 Question: Re: Meaning of PreStepPoint kinetic energy?   (Katya Gilbo - 18 Oct, 2016)
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