- #1
spacetime
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How are neutral elementary particles accelerated? Is it actually practical as of yet, or is there a way we can do so in the future?
Can Neutral Particles be Accelerated by Polarization and External Fields?
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Neutral elementary particles cannot be practically accelerated due to their lack of charge, making traditional acceleration methods ineffective. Current techniques involve neutral beam injection, where ions are accelerated and then neutralized, but this pertains to neutral atoms rather than elementary particles. Neutrons can be produced through high-energy collisions or nuclear reactions, but these methods are not efficient for acceleration. Theoretical approaches suggest that polarized neutral molecules and atoms could be influenced by external electric and magnetic fields, yet these remain largely untested. The discussion raises questions about the purpose and feasibility of accelerating neutral particles, indicating a need for further exploration in this area.
- #2
Danger
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The two ways that I've run across are to accelerate negatively ionized hydrogen atoms and then pass them through rarified gas to strip off the extra electrons, or to accelerate a proton beam and add electrons when it's up to speed. I don't know how widespread or even practical they are. (Or are those particles less 'elementary' than you meant?)
- #3
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Don't we have some discussion about something similar already?
https://www.physicsforums.com/showthread.php?t=90734
Zz.
https://www.physicsforums.com/showthread.php?t=90734
Zz.
- #4
Astronuc
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The process described by Danger is the basis of 'neutral beam' injection, which is the process of accelerating ions to some energy then neutralizing them - but that is a neutral atom - not an elementary particle.
Basically, one does not accelerate a neutral particle.
Neutrons can be ejected from nuclei, either by interaction with a gamma photon of sufficient energy, or by bombardment with a proton, deuteron, alpha particle or other particle. The heavier the projectile particle (which also means increased nuclear charge, Z), the more energy input is required to assure a nuclear reaction, and this would become generally impractical for obtaining neutrons. The D+T fusion reaction produces neutrons of 14.1 MeV.
High energy collisions of particles can be used to produce neutral particles, but they will also produce charged particles as well.
Annihilation of particles e+e- and p\bar{p} can also produce energetic neutral particles, as well as charge particles.
Basically, one does not accelerate a neutral particle.
Neutrons can be ejected from nuclei, either by interaction with a gamma photon of sufficient energy, or by bombardment with a proton, deuteron, alpha particle or other particle. The heavier the projectile particle (which also means increased nuclear charge, Z), the more energy input is required to assure a nuclear reaction, and this would become generally impractical for obtaining neutrons. The D+T fusion reaction produces neutrons of 14.1 MeV.
High energy collisions of particles can be used to produce neutral particles, but they will also produce charged particles as well.
Annihilation of particles e+e- and p\bar{p} can also produce energetic neutral particles, as well as charge particles.
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- #5
Alex Barri
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sure,
to acceleratee neutral elemental particulares is almost unresolved problem. However there is THEORETICAL (not practical) posibilities to accelerate neutral molecules and atoms. Idea is the next. Neutral molecules and atoms are polarized in external electric field. In external magnetic field there is Lorentz force, which influence on moving charges. This is the way how to transform "electric energy" into kinetic (please see attachment). Sure, if direction of current (moving of charges) is changing, directiion of magnetic field is changing also.
Probably, we can use orthogonal laser beems as sources of magnetic and electric fields.
But I don't understand, what task to accelerate neutral particules, molecules, atoms or even neutrons?
to acceleratee neutral elemental particulares is almost unresolved problem. However there is THEORETICAL (not practical) posibilities to accelerate neutral molecules and atoms. Idea is the next. Neutral molecules and atoms are polarized in external electric field. In external magnetic field there is Lorentz force, which influence on moving charges. This is the way how to transform "electric energy" into kinetic (please see attachment). Sure, if direction of current (moving of charges) is changing, directiion of magnetic field is changing also.
Probably, we can use orthogonal laser beems as sources of magnetic and electric fields.
But I don't understand, what task to accelerate neutral particules, molecules, atoms or even neutrons?
Attachments
The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
Hello!
I have a question regarding a beam on an inclined plane. I was considering a beam resting on two supports attached to an inclined plane. I was almost sure that the lower support must be more loaded. My imagination about this problem is shown in the picture below.
Here is how I wrote the condition of equilibrium forces:
$$
\begin{cases}
F_{g\parallel}=F_{t1}+F_{t2}, \\
F_{g\perp}=F_{r1}+F_{r2}
\end{cases}.
$$
On the other hand...
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