High energy Definition and 153 Threads

I was wondering whether it was possible for an extremely high energy photon to exist, or if there's a limit to the energy in just one photon. And I'm talking REALLY high energy here. Like twice the energy of, say, the gamma rays released in a supernova. If this is possible, what is that photon...

Is there any particular reason other than "law of nature" for us to consume organic compounds which are high energy compounds. Are inorganic compounds not so energy rich like organic compounds? What are the reasons? I couldn't really figure out where to post this question, in bio or chem.

I was wondering What would happen if one was to smash a High Energy Electron with a High Energy Proton let's say they both have a kinetic energy of 1 Tev.

Can anybody tell me if any research is currently being carried out,or planned,to investigate further high energy electron/electron collisions?If so what sort of information may such research reveal?The only thing I can think of is that any research may be able to test Coulombs law down to...

I have some questions regarding High Energy Physics Are Computational Physics and Programming Skills of use for The High Energy Physicist or is it sufficient to only know how to use MATLAB ? Also should I take courses in Algebraic topology and Algebraic geometry ? Also What other math courses...

In this article http://www.adlabs.com/library/battery.html" (read PDF) an author proposes high energy density rechargeable aluminum-based batteries.They are based on reaction of Aluminum with Iron (or other metals) and oxygen.I still trying to understand why autor is so sure that such type of...

So when you calculate the scattered electron energy and the scattered photon energy (for 180 degree deflection) you get roughly the following (in keV). Photon(in)__Photon(scattered)__Electron(recoil) 27.5_______24.8______________2.7 81_________62_______________19...

Hydrogen Fusion = High energy? Where does the energy come from when a Hydrogen atom is fused? Is the energy stored in some part (proton, neutron, electron)? Thank you if someone can give me some idea about this. I guess it is about the strong nuclear force, but I'd like to know in a bit more...

For doing research in high energy physics phenomenology, specially in physics beyond standard model, what background should one have? What are the tools researchers in this area generally use? Do you think research in this area to be hard? In phenomenology papers, sometimes very complicated and...

Hi everyone-- This is my first post here, and I don't want this thread to look one of those that is created on every forum resulting on google, helplessly seeking help. I have been reading this forum for some time, and I guess I can ask for some academical advice and guidance. I believe it is...

Hey all, am new here so please go easy on me. This regards observation of Markarian 501 with the MAGIC telescope. Gamma rays appear 4 minutes after the visible light. That high energy photons (gamma rays) travel more slowly through the "quantum foam" has been suggested, and even more mundane...

I've always been fascinated by the simplicity and elegance intertwined within the fabric of High Energy Physics, from Particle Physics to Superstring Theory/LQG and it has convinced me that this is a field I wish to pursue. The idea discoursing my dream is: "Is this still a fruitful area of...

please feel free to correct me on any of this. is it possible for a high energy free electron to collide with a low energy photon? If so, what happens? And can this be replicated in a laboratory setting?

I have a quick question about the units used in high energy physics. In natural units, c = h = 1, but I keep seeing time referenced as t=\frac{1}{m^2}. I figure there's 2 h-bars on top but that still leaves s^2. Can someone straighten me out here? Thanks!

More and more I'm thinking that I'd like to do high energy physics in grad school. But at the same time I recognize that I'm not a genius and the competition is very stiff in high energy physics. So I'm wondering if applying to a particular school for their high energy program would make it...

Can someone give some opinions on the following? The 2 main arguments from this site i can tell are: that hawking radiation isn't proven. And that high energy collisions in the upper atmosphere travel at a fast speed & the small black holes can escape from Earth unlike in the lhc. I...

Hello all, i am trying to calculate the energy deposited by high energy electrons traveling through Silicon. I am dealing with energies in the range of 10^6 - 10^12 eV. I have read that radiative losses will dominate at higher energies and the critical energy where ionization loss =...

One of the arguments for the existence of a minimum distance, the Planck distance, is (*) that in order to probe a smaller distance, you need a probe, e.g. a photon, of wavelength smaller than that distance, that is, of very high energy, and indeed such high energy that when it is localized it...

How important is measure theory for high energy physics? My math skills are poor compared to my physics knowledge, so I want to focus more time studying math rather than physics, but I don't know what type of math to study. I can't find any online video lectures of things like differential...

Top university in my country (Taiwan) Undergrad GPA: 3.3/3.1 overall/major Grad (Master) GPA: 3.5 sGRE: 970 GRE: 580/800/4 v/q/w TOEFL: 112 Publication: 3rd out of 50+ authors in PRL I would like to pursue a PhD in physics, but to do that I'd need to get admitted somewhere first... I...

Hi the question I am asking help for can be found here http://www.hinchingbrookeschool.net/science/documents/A_GCE_Physics_B_2864_01_January_2007_Question_Paper.pdf page 13. question 11b and 11c. Page 12 will give you the experiment setup b - Can somehow please explain how that little...

Can someone please tell me the history of high-energy electron-positron collisions? In specific when was it discovered that such collisions can create hadrons? Any information would be useful. Thanks.

I have to choose my disertation for next year and I've been given a selection of topics. I'm interested in doing an MSc/PhD in high energy physics but my school doesn't have anybody working in that area (only quantum gravity). I've singled it down to some choices: Hamiltonian Algebra and...

when do high energy photons become a paritcle/antiparticle pair?

I originally wanted to go into graduate school for exp. HEP. I now have several options for graduate studies and I'm now confused as to what to do. I want to work on particle physics specifically on the LHC experiments. However, I was told by my undergrad. advisor that after taking my...

Is there any on-line reference which describes the interaction of high energy (> 100 Mev) gamma rays with matter. These are gamma rays from gamma ray bursts, etc. in contrast to low energy from nuclear radiation.

Anyone know anything about this? I've heard that above a "hyperconduction threshhold" of charged particle density, particularly with electrons, the stream or sheet current magnetically locks, syncrotron radiative losses vanish and the stream exibits many of the properties of superconductivity...

High Energy Photon/Curved Space Limit?? Energy curves space. The smaller the wavelength of a photon, the higher its energy. With regards to a high energy photon, Could there be an energy threshold for a photon at which its high energy could curve space to such an extent that the photon...

I want to learn and contribute to things like quantum gravity, M-Theory, and other theories beyond the standard model. I would also like to be able to interpret the results of experiments done in the LHC when it finally works again. So some amount of experimental work is needed too...

Does someone here know about high energy lasers? As I understand it, at a certain field strength you damage your optical media, but I know high power cw lasers do exist, so I wonder: 1) How do you shutter a high power laser? 2) Is it possible to join two laser beams. The only way I see...

Homework Statement a) a photon of energy E = 2m0c2 hits a resting particle of rest mass m0 and is absorbed by it. What is the subsequent speed of the new particle after absorption b)Protons have been observed with energies of up to 1021 eV. How thick does Earth appear to the proton? c)...

I understand that ATP contains energy in its high energy bond. However, there are two high energy bonds in ATP. Thus ADP still has 1 high energy bond. Is this bond used for energy? Can you give an example where the energy of ADP is used?

how to involve people in high energy physics? how to improve our basics? what is needed to improve or build our basics?

Lot of people asking about the jobs and salary of Astrophysics and i have also asked before. Now i ask about high energy physics..What about salary at CERN and Fermilab ? and is it has more job opportunities than Astrophysics and theoritical physics at usa or europe? What do you say?

how do i calculate the depth of water an electron takes to stop at different energies? ( for instance at 10MeV is 6cm) would it be a dirrect relationship? Also i need to know how to calculate shielding for the xrays created. Thickness of concrete? (per MeV) thanks

If you haven't noticed it yet, the budget that was approved by the US House of Representative, and which President Bush intended to sign after it makes its way through the Senate, is a severe blow to several areas of physics, especially in High Energy Physics. This includes a severe cut to the...

http://www.universetoday.com/2007/10/03/high-energy-gamma-rays-go-slower-than-the-speed-of-light/ Bad news or bad journalism?

Will all objects melt and burned if a high energy ray like gamma ray is shined unto it? My guess is no, since gamma photons will be absorbed by the objects if the photon energy is the same as the transition levels in the object. If it doesn't, then the photons will not be absorbed, and just...

Hey all, I am currently revising for my Physics mock but i can't get my head around high energy electron scattering, and the proof this provides for the size of the nucleus. I have read from a variety of texts and some of the links on here but these have lead me to become even more...

What is high energy electron scattering?

in the balmer series the the higher energy level lines from the spectra are not observable using a spectroscope. is this because: they are outside the visible spectrum and the intensity of the lines at high energy levels are much lower than the lower energy lines? If any of my...

Hello all This thread is a continuation of my previous thread (https://www.physicsforums.com/showthread.php?t=122582) where some of my queries about physics curriculum at the undergraduate level were answered. Basic intro: I am getting into a Bachelors program in Electrical Engineering at...

ok this might be a stupid question, but why are high energy states unstable, like electrons in excited state, does it have some force acting on it that's pushing it down, or pulling it towards the nucleus greater when its at a higher state? Belle

I read a comment posted here last night (I'll search around for it) that said something to the effect of a large part of the physics community is unsatisfied with the way current high energy theory is conducted. I am curious if anyone can expound upon this statement for me. In what general way...

http://arxiv.org/abs/astro-ph/0505267 Lorentz violation at high energy: concepts, phenomena and astrophysical constraints Ted Jacobson, Stefano Liberati, David Mattingly 56 pages, 3 figures, Invited article for Annals of Physics "We consider here the possibility of quantum gravity induced...

Just a quick question, has any research instutute such as CERN managed to produce a new stable particle such as a neutron, or even produced and extra electron or proton as a result of colliding electrons and positrons at high energies? or are the untold ?new? but shortlived particles of such a...

ultra high energy cosmic particles?? I know there have been serveral instances where protons have been detected traveling through our atmosphere with energies in excess of 3*10^{20} eV. This means that they might cause macroscopic effects as the proton would be traveling at speeds close to C. I...

I have a few questions: 1) I read that particle physics uses accelarators and computers to compare results according to Feynman diagrams. According to the precision these diagrams may be 70 or 40000 and eventually millions to trillions all very complex to calcuate. At what point (decimal...

I'm sorry, marcus, but as you well know, strings continue to dominate high energy theory, despite your efforts to fool people into somehow doubting this. In fact, marcus, strings have gone through a number of (relatively) barren periods, the last one ending when D-branes and dualities where...

this is a really good survey of all the cosmic ray and gammaray burst news, and the new detectors planned, with some interesting physical discussion of the processes involved It is 54 pages, but only about 50 of that is text. Floyd Stecker may be the or one of the top experts in this area...