High energy Definition and 163 Threads

Can high energy incoming protons and electrons be absorbed and their energies remitted by photons? If so what are the typical ranges of energies emitted and are they heading in the same direction as the original emission if we had a sheet of metal being bombarded by those protons and electrons?

Is it possible (and has it been observed) where a single high energy photon is emitted, but then is received as multiple lower energy photons?

The temperature of expanding Universe is cooler and cooler.The most contribution of energy of background photons(CMB) are of photons having energy ~3kT.Then where have the high energy background photons gone?

Here I am only considering 4 adjacent electrons in electron beam, especially the 2 electrons that are moving in tandem with velocity v. Moving charge will generate circular magnetic current. you can imagine magnetic flux as current, just like electric current. So, the question is same to find...

I've been doing some work with my classes around the Yuri Milner Breakthrough Starshot project to send a tiny nano craft of mass around a few grams to alpha centauri. The starchip would travel at 20% of the speed of light. I've had them calculating various properties of the ship including...

I've always read in my Physics textbooks that high energy EM waves like x-rays and gamma rays, if our body is exposed to them for a long time, can damage the skin significantly. However, how does that happen at an atomic level? As far as I'm concerned, the thing that differentiates a high...

OSU ranks 31 according to ARWU-Physics-2015 and 25 according to US News/Physics. That sounds good enough, except for two facts which I want to be clarified. 1) According to gradschoolshopper.com the acceptance rate at OSU-Physics PhD in Fall 2015 was 35%, which seems quite high for a school of...

Hi,I'm new here, and created my account solely for following question: Does the incompatibility between QM and Relativity indicate a phase transition at high energies? (as in: indicate more than a "could be")

I'm an applying high school student. I know something about the field so don't worrying talking about the subject itself just assume I know how research works. I want to know how does it feel like to be a student in UCSB physics department if you want to have high-energy particle physics as...

Hi guys, my school will offer me an amount of money to have a summer exchange to do anything academic-related. I would like to apply for a summer school on HEP. Do there exist institute that offer summer program which specialized in HEP in the way similar to how Santa Fe Institute offer summer...

Hello! I'm in my 3rd year of my bachelor degree in physics engineering and I'm thinking about taking a master degree in High energy Physics somewhere preferably in europe, could you recommend me some universities with a good program? Thank you

Why should a high energy electron have to remain in a deep potential well?

Hey, what's up? I'm wondering if anyone in this sub-forum actually works on High Energy particles. I want to know if you can introduce me on this matter (yes I know I can read Wikipedia and a ton of book but I want to have the word of a expert in this matter). I'd be glad if you can tell me...

If we put cathode rod with enormouse voltage in vacuum between strong magnetic fields pointing down parallel to rod end then put electron in it with initial speed equal to speed of light and begin circling around cathode, Will electron make gamma -rays according to synchrotron radiation?

Homework Statement Explain what the term "four-momentum transfer ##q##" is Show that for a high energy muon scattering at an angle ##\theta##, the value of ##q^2## is given approximately by; ##q^2=2E_iE_f(1-cos(\theta))## where ##E_i## and ##E_f## are the initial and final values of the muon's...

Hi everybody I'm happy to be part of Physics Forums

The reaction p→n+e++νe is common inside nucleus. But it not considered when we talk about free particle and reason is simply given mass of products being larger than reactants. Now my question is if there is a high energy proton having total energy in order of 2 GeV or let it to be 100 GeV (To...

greetings.. i have 1 question: When a very high energy electron hits a target material, four particles emerge from the target, that is three electrons and a positron, instead of just two electrons, the incident and ejected electrons. It seems that the two extra particles are created out of...

Say we do physics in a very large box of side L. Using the proper superposition of a countable number of momentum eigen states can we write down the wave function of a localized high energy particle in a box? If so, assume the number of superposed momentum states is N. Now randomly throw away...

So I am a senior nuclear engineer with a good GPA and I've actually taken some extra math (PDEs) and physics (nuclear physics and astrophysics) courses over the years. I am extremely interested in detection in general. I have worked at a national lab designing and building neutron detectors and...

I am new to this field can anyone suggest a book for beginner?

If we were to scatter high energy (say E>>m_e) electrons off each other is there a hand wavy argument to come up with a rough estimate for the ratio of inelastic to elastic cross-sections? Would the dominate inelastic collision between two high energy electrons result in a single photon...

Hi every one, This time i am studying Quantum field theory and some times we call also high energy physics. But when we study QCD, more we focus on the confinement part, i.e non-perturbative part. That means low energy or large distance. My question is, can we consider non-perturbative QCD as...

Hello. I read about fast neutron therapy for cancer and the therapy uses a beam of high energy neutrons. How do you excite a particle to make it have "higher" energy.

Hi, So i can accept that photons are virtual particles for the electromagnetic force but i have a question. Considering two stationary point charges. There are photon-like particles exchanged between them to produce the force? If so then placing a double slit between them should create some...

In the case of an atom of Cesium ejecting an electron, it would lose one electron from the 6s orbital. The 6s orbital is very high in energy and similarly so would the electron that is ejected from it, right? So if there was a Nitrogen atom as well, how would it be possible that the Nitrogen...

Homework Statement Why does the ratio: \frac{σ(e^- + e^+ \rightarrow μ^- + μ^+) }{σ(e^- + e^+ \rightarrow τ^- + τ^+)} tend to unity at high energies and would you expect the same for: \frac{σ(e^- + e^+ \rightarrow μ^- + μ^+) }{σ(e^- + e^+ \rightarrow e^- + e^+)} The attempt at...

My plan is to apply for PhD in the US, and my research interest is in theoretical high energy physics. I'm not interested in computation and want to do formal theory, something to do with Srting/GTR/Cosmology. I have gotten my MSc (2-yr) from IIT Kanpur with CPI 7.6/10.0. I'm going to be taking...

Why is it necessary to use Monte Carlo methods in high energy physics? There is Feynman calculus to evaluate matrix elements for various interactions and the relativistic Fermi's Golden Rule for decays and scattering to obtain a decay width or differential cross section. What are we...

Hello, I am opening this thread so as to discuss if possible what you believe is the science case of building a neutrino telescope. Being a fanatic in the field , I would like to hear opinions from whoever wants to say about whether it is important to build such a detector and why. Thank you!

Hello all, My question is really simple. I really like working on problems that involve Nonlinear Dynamics and Chaos, and I also really enjoy fields of Theoretical Physics that probe the nature of reality (quantum mechanics, high energy & elementary particle physics, string theory, etc.) I...

I understand how a galvanic element works at an electrochemical level. I understand how the electrons move from the anode to the canode, and also how electrolysis works. I do not understand how to relate the following in an electrochemical perspective: Battery that drives charge through...

Hi all, Let's say you are at rest with respect to the galaxy, and you have low energy photons all around you. Now, if I crank my energies up relatvisitcally, the frequency and thus E = hf of those photons will increase. Red Light becomes Blue Light, Blue Light becomes UV, UV to X-ray, and...

Hello! I, like many others, am interested in studying physics on my own as my school doesn't offer any kind of physics for ninth graders. (The tenth grade physics class isn't very in depth either; I took part of it in 8th grade). I have exhausted what Khan Academy has to offer, and I am...

Hello, I am a master student, currently starting a master thesis on plasma astrophysics after a master focused on high energy theory (lots of QFT and particle physics, with some supersymmetry, string theory...). I already have funding to continue my master thesis as a PhD, but I am getting...

I realize that I want to do high energy astrophysics (thereafter designated as HEAP). I applied at the MSc level at McGill to do just that. (I have alternate schools for different physical subjects: my own undergraduate school for white dwarves/exoplanets, York for dark energy) But, if I...

The title says it all. I'm contrasting "stable matter" with short-lived particles that quickly decay into something else. (The E=mc2 equation implies that it's possible, but in terms of stable matter, I'm familiar only with it being destroyed, say, in nuclear explosions.) Are ordinary...

Hi all, my question is not strictly related with physics and I don't know if it is the right section. Anyway I have a problem with a collimator: I need 100micron (or maybe smaller) collimator, but the high energy (60-70 MeV) of the beam need a material which is at last 5mm thick, (tungsten...

Hello everyone, I recently joined these forums out of my interest in physics. I was wondering if anybody could guide me to some informative websites dealing with High Energy Particle Physics, as I have decided to do my high school senior thesis on the topic. Any information given is greatly...

I'm an undergrad at a large research university and I've been working in a high energy physics group for about two years now. Recently, a postdoc (my main advisor in the group) and I got into a more general discussion about high energy physics as a whole. He is very concerned that the funding...

Homework Statement This is from Introduction to High Energy Physics by Perkins, question 3.1 Show that the reaction π- + d → n + n + π0 cannot occur for pions at rest. the π's are pions, the d is a deuterium, and the n's are obviously neutrons. Homework Equations Conservation laws I started...

I am planning to publish a paper after extending my MS thesis work. What i am planning to to do is not something new. Some people worked on those recently i will extend that for more models using their formalism. But to do that lots of numerical and computational work is needed. I have written...

The advocators of Darwin’s theory of evolution discover that it is difficult for normal evolution rate alone to form the species diversity now. What factor(s) accelerated the origin of life and species diversity? Reference viewpoints: Novae, especially supernovae, would generate high energy...

Say we have a linear accelerator, that accelerates particles with 1 TeV along direction x. That means we know that the momentum of the particle in direction x is almost exactly 1 TeV. But high-momentum particles have also a very short Broglie wavelength! The spread in x position is small for a...

Let's say I have a solid, and hydrogen peroxide. I slowly release the hydrogen peroxide onto the solid, and both rapidly decompose yielding various compounds (I believe two will always be water and oxygen gas when dealing with hydrogen peroxide). What (solid) compound should I use to release the...

Please teach me this: It seem to me that Salam Weinberg theory of weak interaction does not work at very high energy,because weak bosons are massive and transversal at the limit q^{2}→0. Thank you very much in advance.

Will gravitational force increase or decrease in power in a high amount of energy?

Hi, I'm not very "hip" with how accurate current experimental techniques are at distance scales less then that of the proton's size, but I am wondering about how strong our current theoretical tools are (and assumed to be) at smaller scales. I know we are searching for a quantum theory of...

I am asking this question here rather than in some other forum assuming most of those interested in HEP visit this forum. I personally believe that high energy physics attempts to find answers to some of the most fundamental questions in nature and hence spending huge amount of money for this...

1. I read that the picture of gauge bosons as mediators of interaction originates in and is valid in perturbation theory. But how do we know that picture is correct? We do perturbation theory only because we do not know how to study a system in a fully non-perturbative way. If someday we...