I’d like to add two new topics to this behavior, and I hope that someone could help me.
First one: Decay of Am241
I have simulated the decay of Am241 and using the “/tracking/verbose 2” command I saw that a lot of X-rays from K shell (101.574 and 97.498 keV) are produced if PIXE is OFF as a consequence of these internal conversion transitions: 59.54 -> 0 keV and 102.96 -> 59.54 keV.
I don’t understand how is it possible: in fact from that excited state no internal conversions on K shell are allowed (in fact, the PhotonEvaporation file is correct and the probability is set to 0).
I if simulate the Am241 decay gamma spectrum of HPGe detector, I see that the spectrum is very different from the experimental one because these (and other) high energy X-ray peaks are should not be present.
If I turn ON the PIXE, these X-rays are not produced with this high probability anymore and the “gamma spectrum” of the Am241 decay is compatible with the experimental one.
Now: why that behavior (wrong Am241 deexcitation if PIXE is OFF)? The deexcitation from internal conversion should not be controlled by PIXE, right? Why there is this interaction between PIXE and atom deexcitation from radioactive decay?
I have attached a comparison of the HPGe simulated spectra of Am241 with and without PIXE (red and blue respectively).
I have also attached an output of the tracking/verbose when a 102 X-ray is generated as a consequence of the IC of the 59.5 keV state.
Second one: Electron produced by PIXE
As I reported in the previous posts, I saw that when the PIXE is turned ON a lot of secondary electrons of very low energy are produced during ionization steps (thousands of few eV (or tenth of eV) electrons) in low Z materials.
For example, only one alpha produced in Am241 decay produces something like 2000-3000 secondary electrons in SiO2.
Are these behaviors correct? Is it normal that so many electrons are produced?
Why the production threshold is ignored?
I hope that someone can help me to understand the behavior of PIXE…
Thanks a lot