Gamma Definition and 685 Threads

I've looked around and not found any good sources on the gamma energies from fast neutron activation. I need to find the characteristic gamma rays for an MCNP project and currently, I'm relying on energies I get from running some simple cases I set up for the element of interest. Does anyone...

I was watching a show on Discovery about things that could end the Earth and one of them was a Gamma Ray Burst. They said on the show that by the time we knew it was coming towards us, it would be too late but if it moves a the speed of light or slower wouldn't that mean that we would see the...

I don't know if you've heard the latest news from the MAGIC telescope researchers, but they may possibly have come across evidence of Quantum Foam: http://www.universetoday.com/2007/10/03/high-energy-gamma-rays-go-slower-than-the-speed-of-light/ Gamma rays were apparently found to have...

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

Do all types of supernovae emit gamma rays? If so, is it an initial burst, or does the GRB last as long as the visible light? If so, is the GRB in all directions or just in jets? Thanks.

please reference the link here This is the gamma spectrum for Co-60 from the wikipedia site:http://en.wikipedia.org/wiki/Gamma_spectroscopy though wikipedia might not be the best of sources, I was just wondering a few things. The two peaks around channel 700 and 800 are referred to as a...

Homework Statement "Use the binomial expansion to derive the following results for values of v << c. a) γ ~= 1 + 1/2 v2/c2 b) γ ~= 1 - 1/2 v2/c2 c) γ - 1 ~= 1 - 1/γ =1/2 v2/c2" (where ~= is approximately equal to) Homework Equations As far as I can tell, just γ = (1-v2/c2)-1/2The Attempt at a...

Someone told me that the film badges used in nuclear plants respond to microwave radiation from microwave ovens, as well as to the ionizing radiation they're intended for. I don't understand how this could work. Can someone explain it, or is it just not true?

Hello you guys. I was wondering about the energy limits of the gamma rays. I allready know that the gamma ray spectrum varies from some MeV to 50 MeV (approximately). Does anyone know how can these limits be justified?

IF nothing can escape from a black hole's event horizon, then how do x-rays and Gamma rays escape? and how does it emits light? it says in "Brief History of Time" that the light it emits is just at the boundary of the event horizon. So then how does it escape the gravity and reach earth...

Hi The compound summation formula v = \frac{(m + l)!(al + a + cm)}{m!(l + 1)!} listed in the "Solve v = f(x) for x" thread uses factorials and in an effort to extend it to non-integral values of "m" and "l", I stumbled across the gamma function http://en.wikipedia.org/wiki/Gamma_function" ...

Hello Guys! Please help me in this question: What is the nature of the gamma ray bursts? Why do they last for mo only 2 seconds? thx!

Homework Statement I have a doubt in the following problem. I get an answer which is slightly different from the book answer. 1) A 6 MeV gamma ray is absorbed and dissociates a deuteron into a proton and a neutron. If the neutron makes an angle of 90 degrees with the direction of gamma ray...

First post,a good begin. As far as I know,the band gap is generated from the bragg reflection at the BZ boundary.So I think we just need the special K-point at the surface of 1BZ,and also the band gap(direct or indirect) is at the special K-point on the surface. But it seems not real in most...

I was just doing a little test and one question that I got wrong and can't seem to rationalise the supposed correct in a satisfactory way involved gamma decay and binding energy. What it basically asked was, if gamma decay occurs, and hence energy is released, how is the binding energy per...

If X and Y are gamma distributed random variables, then the ratio X/Y, I was told follows a beta distribution, but all I can find so for is that the ratio X/(X+Y) follows a beta distrinbution. So is it true that X/Y follows a beta distribution?

When an electron and anti-electron come together a gamma ray is produced. So are gamma ray bursts just the product of lots of electrons and anti-electrons coming together? I gather that at least twice the mass of our Sun is required for a gamma ray burster to form,so if we have two masses and...

Homework Statement so, I'm given some sample data: electricity consumption on randomly selected n days, and asked to model the problem using Gamma distribution, then the question is to estimate percentage of days on which consumption was > 10 by using moment estimates. So, I can find the...

Has anyone seen this representation for gamma function before? \Gamma(z) = \int_0^1\ dt\,\, t^{z-1}(e^{-t}\, -\, \sum_{n=0}^N\frac{(-t)^{n}}{n!})\,\, +\,\, \sum_{n=0}^N\frac{(-1)^{n}}{n!}\frac{1}{z+n}\,\, +\,\, \int_1^\infty dt\,\, e^{-t}\,t^{z-1} for Re(z) > -N-1 I can't figure out how...

For starters... What does "data reduction" mean? The book starts throwing around this term (which is also part of the book's title) without even defining it. homework question: Show by numerical calculation that, for the Gaussian probability distribution, the full-width at half maximum...

Hey , i am in grade 11 not yet studied gamma function, and not sure if it will be in the program but i have studied it a bit on my own f(x) = gamma(x) x = 1 : y = 1 x = 2 : y = 1 x = 3 : y = 2 x = 4 : y = 6 x = 5 : y = 24 x = 6 : y = 120 and i found a pattern : 1 * 1 = 1 2 * 1 = 2 3 * 2 = 6...

Homework Statement I'm studing relativity(on extraschool) and known about gamma factor influences time, after some tries, I demostrate that if A is at Va, in relation to B: "light distance"=sqrt("light distance for B"^2-"distance traveled by A"^2) where we say that "light...

Homework Statement Why are gamma rays potentially more dangerous than either alpha particles or beta particles? Homework Equations none The Attempt at a Solution Is it because gamma rays travel more distance before ionising matter so when a gamma ray is fired at you, it could get...

Hi folks, I'm having lots of trouble wrapping my head around this. For a start, how can you have a vibration along a [0 0 0] vector? I mean, where does it point?? And how can it have a finite momentum or frquency? (Does it?) Help would be greatly appreciated, but, please, speak slowly...

My physics professor introduce us to the gamma function a few weeks ago, and I've been thinking about it quite a bit. Is there some sort of significance to the fact that the Gamma function has a local minimum value at about n=1.462? I worked out that the derivative of the gamma function can be...

neutrinos are like electrons but not charged. its partner in the subatomic universe. no charge and subsiquently no mass. http://www.ps.uci.edu/~superk/neutrino.html part of the electromagnetic spectrum?? gamma rays are also electrons, no charge and no significant mass. part of the...

Does anyone have a brief explanation of why the gamma is necessary in the Lorentz transformation.

Hi gang, I'm having trouble with doing a derivative of the Gamma function. I know both the definition of Gamma and Polygamma, but can't see how to get from the derivative of Gamma to Psi times Gamma. Any help or hints would be great. Thanks!

Question: A particle of mass m starting from rest at x=1 moves along the x-axis toward the origin. Its potential energy is V=\frac{1}{2}mlnx. Write the Lagrange equation and integrate it to find the time required for the particle to reach the origin. Lagrange Equation in 1-D...

For what values of k would \mathop {\lim }\limits_{x \to \infty } \frac{{\Gamma \left( {kx + 1} \right)}} {{x^{kx} }} converge?

Hi, I am trying to get a feel for electrons in semiconductros (say GaAs) with regards to the bandstructure of the material. I understand that the velocity of the electron can be written as ~ d(Energy)/d(wavevector) so at band extrema such as Gamma-point or X-point this goes to zero...

How can Gamma rays be used as a projectile ? It need s the nucleus to be extremely unstable.Please give description as well as examples.of such reaction.

Questions, questions, questions... I hope some one can answer these questions. thank you. :) 1. Describe the process of Compton Scattering, explaining carefully how both attenuation and absorption of X-rays occur. 2. How does the process of Compton scattering of X-rays depend on the nature...

Hey Recently I have been studied for a physics test on Nuclear Technology. A question I came across asked me to explain the difference between the penetrating ability of the three different types of radiation, alpha, beta and gamma and explain why. I know that gamma has the highest penetrating...

I'm writing a paper which includes a treatment of the gamma function, and I am taking suggestions for non-elementary formulae involving the gamma function. I have the usual limit of a product definition, two infinite products, the usual improper integrals for Re[z]>0, the Guass multiplication...

Since gamma rays are much more energetic, then shouldn't they travel faster. Gamma rays are light, but since they are faster shouldn't they travel faster than c?

Hello. Where do the peaks observed in gamma spectroscopy come from? May some specific angles for diffraction be a reason?

Hello, I think I need the following for a QFT problem.tr(\gamma^{5}\gamma^{\mu}\gamma^{\alpha}\gamma^{\beta}\gamma^{\nu}\gamma^{\rho}\gamma^{\sigma}) I know that...

Wasn't quite sure where to post this considering it talks about 2 subjects, but i guess this is a good place to start. My question is: How [if at all] can high energy EM waves affect electronic systems? More specifically gamma rays. I am by no means an electro-physicist, cosmic radiation is...

About gamma radiation bursts What if the bursts we observe are the light equivalent of a sonic boom? The energy report of an object surpassing the speed of light. These could be tell tale signs of superluminal or warp travel. As an oblect reaches the speed of light, light would be compressed...

Hiya, I'm having trouble finding a simple proof for gamma of 1/2 = root pi? Any suggestions

Hello, This problem is related to the beta decay of a neutron in a proton an electron and a anti-neutrino. I need to prove that, in the limit where the mass of the neutron and the proton goes to infinity, m_P, m_N \to \infty, we have \bar{u}\gamma^\mu(1-\alpha \gamma_5)(\gamma^\alpha k_\alpha...

Am I right in understanding that Gamma Rays can decay into an electron-positron pair without interacting with any matter as indicated by Bubble Chamber results?

The given problem is this: Solve using the gamma function \int_0^{\infty}\sqrt{x}\exp{^{-x}}{ dx}My problem is that I don't know how to use the gamma function. It doesn't make sense to me...any insight would be helpful. Thanks in advance

Last night I was watching a show on the science channel about astronomy. The show was very interesting but it was after my bed time and I fell asleep when they were talking about the mysterious origin of gamma ray burst. Last I remember they were talking about the burst coming from the early far...

As a tropical depression, it was not expected to be a threat to the US. Well Nature had other ideas. Gamma may reach hurricane strength if it passes into the Gulf of Mexico, and it could follow Wilma's track to S. Florida. http://www.wunderground.com/tropical/tracking/at200527.html...

can electromagnetic shielding in space protect humans (for a long period) from gamma radiation?? i:rolleyes:

If we could produce the highest order of Gamma Ray energy of a single photon and bombarded an Atom with direct precision, Would the Atom be Annihilated? If the Atom is Annihilated then would the release of Energy of the Atom be greater than the Single High Energy Gamma Photon? Assume that...

I am wondering how the following statement holds true: \Gamma\left(\frac{1}{2}\right)=\int_0^{\infty}e^{-x}x^{-\frac{1}{2}}\,dx=\sqrt{\pi} I know how to show that: \int_0^{\infty}e^{-x^2}\,dx=\frac{\sqrt{\pi}}{2} But I can't seem to apply that method (converting to a double-integral) to the...

how to calculate from a spectrum gamma, of a water sample, the equivalent amount in Sivert (Sv)