16
votes
Accepted
Why are accelerator beam neutrino experiments built an angle off the beam direction?
Off-axis beams, depending on the neutrino energy and the production source, can offer fluxes of neutrinos with a much more narrow range of energies. This is useful because the incoming neutrino energy ...
- 2,006
13
votes
Why are accelerator beam neutrino experiments built an angle off the beam direction?
It depends on the particular experiment , and depends on the kinematics of decays. Example here in this link
Also the use of off-axis neutrinos has been considered
for NuMI and CNGS as a future ...
- 229k
9
votes
Accepted
Weight of magnet depends on its N-S orientation?
Local magnetic field gradients in a lab can easily be orders of magnitude larger that predicted by a naive Earth dipole model. Local Earth surface magnetic fields are typically $\sim 50\,\mu\mathrm{T}$...
- 5,603
7
votes
How can a meson beam be created?
It is an engineering problem. A brief description is here.
In this experiment, a beam of ∼ 100 GeV proton from the Super Proton Synchrotron
(SPS) are used to produce pions off a conventional solid ...
- 229k
3
votes
Accepted
How can a meson beam be created?
I didn't find a video by Don Lincoln, but here is one by Kristy Duffy, who is also from FermiLab. How do particle accelerators make neutrinos?
The process starts with Hydrogen. Atoms are ionized so ...
- 31.1k
2
votes
Experimental verification of Newton's laws
Newton's laws are more akin to thought experiments. However, the sandwich on my plate remained still for 30 minutes until I picked it up. So this could be counted as experimental evidence.
2
votes
How to understand measurement uncertainty (error) from scientific papers in this form 6.67430(15)?
If I read a scientific article and they publish some value like this here 6.67430(15)×10−11. How can I understand what is the real value with 95% confidence interval without knowing how many ...
- 81.6k
2
votes
Accepted
Experiment Prediction: How much light can pass through an opening?
Light consists of photons which are boson. Bosons like to exists in the same state. So if you can manage to let one photon pass through a specific hole, then you can pass an arbitrary number of ...
- 13.1k
2
votes
How does the Kennedy-Thorndike experiment test for time-dilation?
The way the KT experiment tests for time-dilation is similar to how the light-clock thought experiment can reveal time-dilation. They're not exactly the same, but I would argue the principles are very ...
- 6,437
2
votes
Accepted
Does the Sun or Moon affect weight measurements on Earth?
As I understand, your question is: at noon, the solar gravity attracts an object on a scale what would turn it lighter. At midnight its gravitational force adds to the Earth's one, and the object ...
- 13.7k
1
vote
What is a CP number? In terms of CP-Symmetry and CP-Violation?
Background. P is an operation that mirror-reflects a state in space, and C an operation that converts particles into antiparticles, reversing their charge, flavor, baryon #, lepton #, fermion #, and ...
- 54.1k
1
vote
Accepted
Error analysis in measuring wavelength using diffraction grating
For the data driven approach I deliberately reserve a second answer: it's a different approach, and it's lengthy, too.
First let's have a look and slightly rearrange your data:
$d \cdot \sin(\alpha_m)...
- 384
1
vote
Error analysis in measuring wavelength using diffraction grating
Thanks. Here's the classical approach. For the data driven one I need to review your data, which look a bit strange at first glance (though you might be right to view it this way).
3 Steps:
calculate ...
- 384
1
vote
Accepted
Will water be superconducting if add enough pressure?
There is a theoretical prediction that pure $\mathrm{H_2O}$ will become a superconductor at pressures above $5$ TPa with a critical temperature of $\mathrm{T_c=}1.8\,\mathrm{K}$.
Such pressures are ...
- 5,603
1
vote
Does the Sun or Moon affect weight measurements on Earth?
The Earth itself is in free-fall around the Sun. But people (and everything else) on the surface of the Earth are not quite in free-fall around the Sun because (a) the Earth is rotating and (b) things ...
- 40.8k
1
vote
Experiment Prediction: How much light can pass through an opening?
There are always boundary conditions that only become relevant when you scale the process. You want to see an effect with a small hole, otherwise you would simply make your hole so large that no ...
- 9,287
1
vote
Structure functions for mesons
Experimental knowledge of the partonic structure of mesons (the pion and kaon) is very limited due to the lack of a stable pion target! Our current knowledge of the pion structure function in the ...
- 54.1k
1
vote
How to understand measurement uncertainty (error) from scientific papers in this form 6.67430(15)?
You would understand this to indicate that $1.5\times 10^{-11}$ is an estimate of the standard deviation of the mean (often called the standard error).
The standard error would contain 68% of the ...
- 120k
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