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Not merely can it transfer its momentum as well as its energy when it interacts, but it must. If the target atom is in a fluid context (liquid, gas, plasma), then that energy and momentum must end up …

It is, perhaps easier to catalog the non-photon sources and leave the addition and unit conversion to you. The cosmic background is almost entirely muons. If you spend times in building with non-tri …

Starting from So far I know, when an atomic nucleus emits a gamma-ray photon, the nucleus must recoil to conserve linear momentum. is to begin with a classical expectation. Instead say, "When a …

Well, it depends on the detector package, but you have three basic choices: Restricted geometry You rig the detector such that only a very limited range of angles is possible. Generally with collima …

Let's turn it around and ask a different question. Is there another direct measurement of the neutrino speed that sets such a tight limit? (Admittedly, the directness is contingent on the coincidence …

Start with a table of the isotopes. Look up Cs-137--the only decay channel is by $\beta^-$ (that is the conversion of a neutron into a proton with the release of an electron and a electron anti-neutri …

Your problem here has entirely to do with language and not physics. The distinction that the authors are making and you are ignoring is that gamma rays ionize when they interact, but not as they tra …

All high bias detectors experience electronics noise which rises roughly exponentially toward low energy. Add to that the (single, double, ...) Compton edges from the lines you are trying to sample an …

I don't know the origin of either convention, so I am reluctant to make any absolute statements, but as an experimenter the question I ask myself is "What material have I learned is present in the sam …

When you are writing a simulation you decide what to put into it. If you want it to be a useful simulation, you generally take guidance on those decisions for what you think the real situation is. S …

I'm not an expert and I know we have some people on the site who are much closer to being experts, but there are several points that I can offer to tide you over. A large fraction of the precautions …

The counting error should be $\sqrt{N}$ where $N$ is the total number of counts in the range considered (here the FWHM). It is possible that there are other sources of error we need to be dealt with s …

Photons are photons. If photons from one source experiences a certain kind of physics, then photons from other sources do too. So, short answer: yes. And they can produce Compton edges as well.

Answering the Question as Asked The raw data is available from a unreasonable and unmanageable slew of papers published in endless venues over the last upteen decades. Ouch. The processed data is av …

At tree level, a matter-antimatter annihilation reaction doesn't just produce gamma rays, nor can you exclude neutrinos in the final state. Even the simplest such reaction can—given enough energy—pro …