the tools used to detect (and sometimes) characterize ionizing radiation. This tag is appropriate for question about the characteristics and behavior of all such devices from the simplest Geiger-Muller tube, to the compound monsters used by high-energy experiments to the mega-ton instrumented volume ...

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3
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0answers
42 views

Is a DIY neutrino detector feasible?

How long does a neutrino detector filled with distilled water need to be to pick up neutrinos from one direction at about the level of a distant star within our galaxy? Would an off the shelf ...
1
vote
0answers
26 views

How do modern particle detectors identify and segregate different particles

What is the specific particle detector technology used at CERN or similar Institutions. Is it essentially a big digital camera? When said particles are detected, how are they segregated, How does this ...
3
votes
0answers
26 views

Detection of radioactive iodine at trash dumps [closed]

I have a cat that is getting radioactive iodine therapy and I am told I must flush the litter for 2 weeks because if I throw it away normally the dump will detect the radiation and fine me. This ...
1
vote
0answers
32 views

Is a deviation from the equal flavor ratio of neutrinos ruled out experimentally?

Neutrinos have a lifetime which exceeds the lifetime of our universe. Therefore we measure an equal ratio of all three neutrino flavors, 1:1:1. However, lets assume that the heavier neutrinos can ...
0
votes
3answers
49 views

Are Geiger counters isotope-specific?

I was talking with an employee at a company that does I-131 therapy for hyperthyroidism and they said that the Geiger counters they use are "tuned" for I-131, implying that regular Geiger counters are ...
1
vote
0answers
67 views

How would you build a small cyclotron (particle accelerator)? [closed]

I heard Michio Kaku built a small cyclotron when he was young. I bought a book called "Principles of charged particle acceleration" where it explains the basic functioning of particle accelerators. ...
1
vote
1answer
58 views

How do you detect a photon without consuming it?

In double slit experiment, they say they can put a detector after the slit so they know exactly which slit the photon has passed. But if you successfully detect a photon, isn't the photon also ...
0
votes
1answer
12 views

Detection of the He-nuclei in the historical Rutherford scattering experiment

Which method did Rutherford use to detect the Helium nuclei in his scattering experiment?
0
votes
0answers
25 views

How to intergate the cross section over the surface of a detector?

My beam moves along the $X$ axis. I know the cross section $\frac{d \sigma}{d \Omega}$. My rectangular detector is perpendicular to the $XY$ plane and its surface is perpendicular to the line ...
0
votes
1answer
30 views

What exactly is measured in a e.g. hadronic calorimeter - momentum or energy of a particle?

I got a little puzzled with the concept of hadronic/electromagnetic calorimeter. Do they measure the energy of the particle e.g. an electron, like the first entry of the four-momentum, or the ...
0
votes
1answer
25 views

What keeps charge from “spreading” in a CCD pixel?

In a CCD, you generally have a photosensitive substrate (e.g. n-doped silicon) that is attached to a network of electrodes that, after exposure, will move the charge, allowing the CCD to be "read". ...
1
vote
0answers
28 views

What does “fully depleted” mean?

In many papers/articles on CCDs, particularly those used for dark energy surveys and dark matter detection, the term "fully depleted CCD" is used. What does this mean? References: ...
0
votes
1answer
73 views

Can we detect a photon's direction?

The question of if a photon even has a direction may be up for interpretation, but I wanted to know if it's possible for a device to absorb most light from every which direction and only detect light ...
0
votes
0answers
35 views

landau distribution as a model of charge deposition in silicon detector

I am would like to know if it is any explanation why the charge collected by the detector can is model by the Landau distribution. Is it any deeper explanation instead of "it is working" ? I look ...
1
vote
3answers
83 views

Detectable interactions in Cherenkov detectors

What are the possible (and at least somewhat probable) particle interactions that could leave a signal in a cherenkov detector (such as super-k)? One source suggested there would be inverse beta ...
1
vote
1answer
271 views

Why did scientists use a zinc-sulfide coated screen to detect the alpha, beta, and gamma radiation?

How does a zinc-sulfide coated screen work, and how does it manage to detect high-frequency radiation, electrons, and helium? Could it be possible that a delta ray managed to somehow slip past ...
9
votes
2answers
739 views

How do tracking detectors in particle accelerators create the pretty pictures we see?

I have read several sources about tracking detectors used in particle accelerators like LHC, but still have not found a more detailed source that can still be understood by a layperson like myself. I ...
1
vote
1answer
31 views

Why are high energies needed in collision experiments?

Why are high energies needed in collision experiments? I believe it has something to do with the interactions needed between particles to find other particles only happening at high energies? Is this ...
0
votes
1answer
73 views

Does elementary particle emit photon?

Charged particles are accelerated by the magnetic field in a particle collider before allowed to smash together at specific location where the detectors are housed. My question is do the ...
7
votes
3answers
561 views

Fiducial volume in collider/detector physics

I'm trying to make some sense of ATLAS measurements for a personal project to learn how to use Pythia, and part of my work requires me to recreate the distribution for Z boson decay. I encountered the ...
1
vote
1answer
64 views

Predict spread of signal peak in particle physics experiments, due to detector resolution

I am working on an LHCb experiment, in particular the $B^0 \rightarrow K^{*0} \gamma$ decay. The $K^{*0}$ decays into $K^+$ and $\pi^-$. So the decay products of the decay are $\gamma, K^+ $and $ ...
4
votes
1answer
44 views

Is it possible to use hot cloudy water as a cloud chamber?

This morning I got some warm water from the shower head to a dark plastic basin to wash some sensitive clothes. During the process lots of tiny bubbles got into the water so it had a cloudy ...
0
votes
0answers
16 views

Are there any particles emitted by the sun that can be observed in a Wilson cloud chamber?

Are there any particles emitted by the sun that can be observed in a Wilson cloud chamber? Are there better hours of the day/time of the year to see them? More generally, is there a list of cosmic ...
0
votes
0answers
36 views

Difference betwen combinatorial and correlated background in particle physics?

What is the difference, in particle physics experiments, between combinatorial and correlated backgrounds?
4
votes
1answer
73 views

Rejecting background in $B$-meson decay

I want to reconstruct the $B$ mass from the decay $$ B^0 \rightarrow K^{0*} \gamma \quad\text{ where }\quad K^{0*} \rightarrow K^{+} \pi^{-} $$ and the equivalent antiparticle decay. A key element in ...
0
votes
1answer
56 views

Trace of gamma particle

Can we have a detector, making traces of gamma particles (gamma photons) visible? Usually they are invisible until pair born or something. UPDATE G-M tube can detect gamma particles. Can we put ...
0
votes
1answer
37 views

Particle physics plots: on the x-axis, Mass or (Mass)$^2$?

This might be very silly, but I have seen particle physics graphs plotted against $mc^2$ and others plotted against $(mc^2)^2$, which is actually the invariant $p_{\mu}p^{\mu}$. Is there a physical ...
2
votes
1answer
85 views

Why, in particle physcis experiments, the background is sometimes a decaying exponential?

Take, as an example, the Higgs boson finding: But the same is found in many other particle physics detector graphs... **Why is the shape of the background a decaying exponential? ** At least ...
2
votes
1answer
45 views

“Double-counting” in particle detectors

Apparently, when analysing events from particle detectors, one may incur in double-counting, which happens when a physics object appears as a single object of its own type, but it may also be ...
1
vote
2answers
826 views

How are quarks and leptons detected experimentally?

How are quarks and leptons (including subatomic particles) detected in the laboratory,especially when most hadrons and leptons have a lifespan for a considerable small amount of time?Also how do we ...
0
votes
2answers
68 views

Photon yield of NaI

We have to calculate the photon yield of the scintillator NaI. We have measured his pulse height spectrum but we have no idea how to solve this problem. Can someone explain it? The source that we used ...
1
vote
2answers
162 views

can we detect the photons in the interaction of two charged bodies?

if the interaction of two charged bodies is through the photon exchange: 1) how much is the energy of these photons and how do we calculate their energies? 2) can these photons be detected by a photon ...
0
votes
0answers
49 views

Do twice more atoms absorb twice more photons?

Let's assume you have a photon detector that detect individual photons striking it when exposed to a weak light source. Now let's assume you somehow managed to make a denser detector from the same ...
1
vote
0answers
144 views

Radiation Safety of some Particle Accelerators in CERN?

I am trying to study the radiation safety and what kind of roles are required there with particle accelerators. Radiation safety groups of CERN is here. I contacted their a few members of them. I ...
1
vote
0answers
24 views

How would gravitons be detected? [duplicate]

How would gravitons be detected indirectly or directly, in space or on earth? And what experiments are going on to find gravitons?
0
votes
1answer
129 views

Convolution of Gaussian with exponential decay?

I need to convolve an exponential decay (defined as the exponential $Ae^{-\lambda t}$ from $0$ to $+\infty$) with a Gaussian of known standard deviation $\sigma$, in other words I need to compute the ...
1
vote
1answer
82 views

Using tracking detector in a double slit experiment, what would we see?

Let's say we put tracking detector (eg. a cloud chamber or a more advanced device) behind the double slits. What would we see? I think the interference pattern is three dimensional. So there are ...
2
votes
1answer
51 views

How doesn't an ionization chamber leak?

I'm sure my understanding of an ionization chamber is incorrect, so please point out the error. Suppose we are using an sealed ionization chamber to detect the energies (trajectories) of a particular ...
0
votes
1answer
74 views

Resolution of experiment is lower than the detector, so how to weigh the data?

I am attempting to create an atomic model based on data from a transmission electron microscope (TEM). Basically you shoot electrons at bunch of identical molecules stuck to a grid, and look at the ...
3
votes
0answers
43 views

Sensitivity of Cloud Chamber

I have been watching some videos on cloud chambers: https://www.youtube.com/watch?v=Efgy1bV2aQo and they are quite amazing. What I can't figure out, is why aren't these chambers over loaded with ...
1
vote
1answer
90 views

Neutrinos at Super-Kamiokande

Why did the Super-Kamiokande experiment detect half the number of neutrinos emanating from below the earth as from above it?
2
votes
3answers
281 views

Detecting negative energy products in particle accelerators

Are the detectors in a typical particle accelerator experiment, either in Fermilab, or now in LHC, sensitive to negative energy particles? How would a negative energy particle, (say, a negative ...
4
votes
3answers
327 views

How can a detector distinguish between a photon and a gluon

Considering that both gluons and photons have no mass, no charge and spin 1, I was wondering how one can tell the difference, if they hit a detector after a collision at the LHC. I know that gluons ...
2
votes
1answer
92 views

Why Microchannel Plates can be operated only in vacuum?

Why it is said that the Microchannel Plates can be operated in vacuum? What is the maximum pressure in which it can be operated? Also, while it is not operating, should it be kept in vacuum? Is this ...
6
votes
7answers
346 views

Effect of wavelength on photon detection

When some photon detector detects a photon, is it an instantaneous process (because a photon can be thought of as a point particle), or does the detection require a finite amount of time depending on ...
4
votes
1answer
149 views

How use the Higgs branching ratio plot to extract information about the Higgs mass compared to experiment?

What does the plot of higgs branching ratio (see figure below) say about the higgs mass anyway? How can one use it as a guide to find the higgs mass experimentally? If we e.g. go to $M_H=126$ GeV ...
-1
votes
1answer
113 views

Lifespan of particles

After reading a very informative tutorial on elementary particles physics over at http://www.particleadventure.org, I have a question I can't figure out. I understand the need to accelerate a ...
9
votes
2answers
4k views

Which is the smallest known particle that scientists have actually *seen with their eyes*? [closed]

Which is the smallest particle that has been actually seen by the scientists? When I say "actually seen", (may be using some ultra advanced microscope or any other man made eye, using any wavelength ...
0
votes
0answers
47 views

Quantum Hall Effect Dark Matter Detector?

Has anyone used a Quantum Hall effect detector to detect dark matter? I was looking at the following animation on wikipedia: ...
1
vote
0answers
38 views

Superconducting loop as a particle detector?

Imagine that one has induced a persistent current in a superconducting loop. If a particle interacted with an electron in one of the Cooper pairs then would some decoherence and dissipation occur? I ...