Recent content by Zuzana

number of photoelectrons. measured vs expected

Hello :) I try to fit some parameters of the particle (e.g. energy, direction) be means of log-likelihood minimization. Input data to likelihood function are pulses amplitudes, while Poisson distribution is used. However, the problem is that Poisson distribution is as follows i.e. for higher...

I do not understand why proton with energy > 50 EeV cannot interact with CMB, because there is a cosmic ray paradox and one of possible explanations is that neutrino and antineutrino interacts and create hadrons with extreme energies, is there for these extreme-energy CRs interaction with CMB or...

Hello, I would like to ask, why there cannot be detected cosmic rays with energies higher than ~ 10^20 eV, i.e. beyond the GZK limit? Thanks a lot in advance for the answer.

Thank you very much for the explanation.

Atmospheric muon with energy > 10 GeV can reach the Earth and can be detected, so electron neutrino won't be detected, since the muon did not decay in detector. Does it mean that only electron neutrinos, which come from decay of muon (energy < 10 GeV) can be detected at the Earth?

Hi, I would like to ask question about atmospheric electron neutrinos. It is known that atmospheric electron neutrinos originate from the decay of muon in the atmosphere, but we can also calculate that muon with energy more than 10 GeV is able to penetrate about 100 km, so it does not decay and...

Now, I understand. Thanks a lot for the reply.

what do you mean by "within the nucleus"? electrons are at the atomic orbitals (shells outside the nucleus).

Hi, I would like to ask, why K-shell electrons coming from the internal conversion are much more frequent than L or M-shell electrons (see Fig). K-shell electrons are more tightly bound than L-shell, I would say that it is easier for gamma particle to kick off less tightly electron, no? Thank...

yes, I understand this, but I do not understand why should 2*sigma = 0.05*countRate.

Hello, I watched MIT course on Nuclear physics (13. Practical Radiation Counting Experiments on ytb) and I do not understand why 2*sigma (standard deviation) = 0.05* countRate. As far as I know, integral of normal distribution from -2sigma to 2 sigma gives 95 % probability, but how can 2*sigma...