Scattering Definition and 820 Threads

Homework Statement Show that, regardless of its initial energy, a photon cannot undergo compton scattering through an angle of more than 60 degrees and still be able to produce an electron positron pair. (Hint: Start by expressing the Compton wavelength of the electron in terms of the...

there are several questions I'm going to ask about scattering. however, first i got to say something on a plane wave, say, 'exp(ik*r)'. Here both k and r are vectors and the star means a scalar product. As is known, this state has a current density J proportional to 'k' but independent on 'r'...

Homework Statement An Alpha particle of a Rutherford-type scattering experiment is shot directly toward a platinum nucleus. One of the particles was apparently aimed directly at the centre of the nucleus cause it shot 180 degrees back along the same path. How close does it come to the...

Can Someone look over this and tell me if the work is correct. Homework Statement An object comes in with known velocity (v) and known mass (m) moving directly along the x-axis. It strikes another object of the same mass (m) which is stationary. Find the change in energy of the incoming...

Homework Statement Griffiths Particle Physics, problem 7.24. Evaluate the amplitude for electron-muon scattering in the center-of-momentum system, assuming the e and mu approach one another along the z-axis, repel, and return back along the z-axis. Assume initial and final particles to...

What is the difference between Scattering Crossection and Absorption Crossection in nuclear reaction crossection? Please help me for one numerical problem; "[FONT="Comic Sans MS"]Arsenic As^{33}_{75} has an absorption cross section for thermal neutrons of 4.1 b and a scattering cross...

Can Someone look over this and tell me if the work is correct. Homework Statement An object comes in with known velocity (v) and known mass (m) moving directly along the x-axis. It strikes another object of the same mass (m) which is stationary. Find the change in energy of the incoming...

Hi guys...I am trying the problem 5.2 from Peskin to calculate cross section for Bhabha scattering. In the interference (cross) term, I'm getting a term involving trace of 8 gamma matrices and I am having some trouble in evaluating it. So can anyone help? The term is...

A raman scattered photon occurs when you drive the bonds of a molecule causing oscillations between the bonded molecules right? What exactly emits the photon? If its the electrons, then shouldn't multiple photons be emitted with the same wavelength?

Hi! I'd like to ask you what do the texts mean by scattering, bound and antibound states. The context for these concepts is scattering theory. Thanks!

Hello, just need some guidance - I hope my logic is correct! Homework Statement So I have a scenario where the Earth's atmosphere, instead of scattering blue light from the sun, actually scatters green light based on Rayleigh scattering. I know that the sky will therefore appear...

Hello, So I have a scenario where the Earth's atmosphere, instead of scattering blue light from the sun, actually scatters green light based on Rayleigh scattering. I know that the sky will therefore appear green, but how will the sun appear? I reasoned the sun will be magenta using...

Homework Statement A photon scatters in the backward direction (\theta= 180) from a free proton that is initially at rest. What must the wavelength of the incident photon be if it is to undergo a 10.0% change in wavelength as a result of the scattering? Homework Equations...

... if you consider something simple momentum conservation, like in the case of a bullet, if you consider the system of the gun and the bullet, the momentum is zero before and after the shot is fired. same for collisions etc... however when you consider something like a deflection in...

Homework Statement Hi 1) I read the following article: http://pdg.lbl.gov/2005/reviews/passagerpp.pdf On page 12 of the .pdf there is a figure, figure 27.8, which shows how a charged particle deviates from it's path when scattered by the Coulomb force that comes from the nuclei of the matter...

Homework Statement How to square this : (Pi+m.c-Pf)^2 ? Homework Equations The Attempt at a Solution I did : Pi^2 + m^2*c^2 + Pf^2... but then I don't know the rest of the completion.. please help me.. Thank you in advance..

Okay, so I have two questions, both pertaining to the Compton Effect. Homework Statement Evaluate the maximum kinetic energy for a recoiling electron that is struck by a photon with momentum 0.04MeV/c Homework Equations Maximum Kinetic energy: E_{k} = \frac{hf}{1 + (mc^{2}/2hf}...

1. Are there possible (4th order)process of "decay of photon" \gamma\rightarrow 3 \gamma with one-photon initial state and 3-photon final state? Intuition tells me there are no such processes. But because of crossing symmetry of scattering amplitude one can argue that such processes should be...

Homework Statement Not homework, just for fun. I want to derive Compton Scattering equations using Mandel-Stam variables as opposed to the way that I have done it in class using the usual energy and momentum conservation Homework Equations (p_\mu+p_{ei}_\mu)^2=(p'_\mu+p_e_\mu)^{2}=s p is the...

hi, i want to know why scattering can occur when the light beam meet the particle, dust in atmosphere or molecules in water ..., but why not when they meet the glass surface and let the electrons in the glass surface be scattered? can anyone kindly help me, and tell me more about this ? thanks...

Problem Determine the differential and total cross sections for scattering from a "hard sphere" of radius R ("hard" means impenetrable). Relevant Formulae \sigma (\Omega) d \Omega = \frac{number \ of \ particles \ scattered \ into \ solid \ angle \ per \ unit \ time}{incident \ intensity}...

Hello, can anyone tell me the equation to the Mie scattering. I have salt particles of a specific size, and I want to work out the Mie scattering of it. Thanks a lot From steve.

i don't know why the longer the wavelenght, the easier for it to be sattered ?

Hello everyone, First and foremost I would like to see if everyone's having a good day? (assuming you respond yes) Awsome! Secondly I was hoping someone would be able to help me understand how dielectrics work. I don't need to know everything about dielectrics. I only need to know how...

Homework Statement A beam of low energy protons is observed to scatter elastically from a target of neutrons. Sketch the variation of the differential cross section with the resulting scattering angle and comment on a characteristic feature of the strong force than can be deduced...

Homework Statement Particles are scattered (classically) from a paraboloid shape. The surface is given by the relation: z = a \left(\frac{y^2+x^2}{R^2}-1 \right) for x^2 +y^2 leq R^2 where a and R are constants. The particle is incident from z = -infinity with impact parameter s. Show that...

Homework Statement Particles of scattered off the surface of an ellipsoid given by x^+y^2+z^2/f^2 = R^2, where f and R are constants. Find the differential cross-section.Homework Equations The Attempt at a Solution Let s be the impact parameter. I can find s as a function of the scattering...

I have one doubt about Bhabha scattering which is scattering between one electron and one positron, two oppositely charged particles. Why should they scatter each other away rather than attract and eventually annihilate themselves, giving rise to the pair annihilation process? (This process is...

Hello experts, I've had some fun reading the posts in the various forums, and now it's time for me to ask a question. Is it possible to scatter light off of a BCS semiconductor such that the light can be considered to scatter from the coherent state of many Cooper pairs, rather than just...

Hi , I got stuck on a point of griffiths' scattering problem on "the introduction to elementary particles" Homework Statement Consider the case of elastic scattering , A+B-->A+B , in the lab frame (B initially at rest) assuming the target is so heavy (mbc2 >> Ea) that its recoil is negligible...

Homework Statement I have to simulate a two-level electron scattering process. 1000 electrons start in state i and over time, end up in state f. I need to plot the number of electrons in each state as a function of time. Homework Equations None. The Attempt at a Solution The probability...

Can anyone please refer to a link where Compton Scattering is treated considering the electron to be bound in the atom?

Can anybody provide me with information on thomson scattering for someone who hasn't done electrodynamics? I find ones like http://farside.ph.utexas.edu/teaching/jk1/lectures/node85.html but I don't know anything about solid angles and the scattering cross section is confusing me. I'm...

I originally posted this in the homework section until I realized the homework section only covers through undergraduate courses. The course I am currently in is a graduate level Medical Physics course. So if you don't mind, here is the thread I posted in the homework section. I am...

Homework Statement A photon of wavelength \lambda enters an electron gas.What is the minimum number of collisions that could result in the photon being completely absorbed in the gas? (a) \approx\lambda\frac{mc}{2h} (b) \approx\lambda\frac{mc}{h} (c) \approx\lambda\frac{2mc}{h}...

Homework Statement A beam of \alpha-particles, of kinetic energy 5.3 MeV and intensity 10^{4} particle/sec, is incident normally on gold foil with thinckness 1 x 10^{-5} cm. (The density, atomic weight and atomic number of gold are 19.3 g/cm, 197 and 79 respectively.) A particle counter of...

Homework Statement The fraction of 6.0 MeV protons scattered by thin gold foil, of density \rho=19.3 g/cm^{3}, from the incident beam into a region where scattering angles exceed 60 degrees is equal to 2.0 x 10^{-5} . Calculate the thickness of the gold foil using the result of the previous...

Homework Statement 50uA beam of 1MeV proton Target = Iron of 0.05um thick Calculate scattered current density at distance 5 cm at 20 degrees angle Homework Equations \sigma(E,\theta) = \pi*Z_{1}Z_{2}e^{4}(M_{1}/M_{2})/ET^{2}The Attempt at a Solution I figured the probability of scattering to...

Hello, I do a research concerning Mie scattering. The Mie formulae are angle dependent, but I need a function from which I'll get the scatterd angle (as a function of some dependent parameter), can someone please direct me in the right way ?

Homework Statement If the maximum energy transferred to an electron during Compton Scattering is 50KeV, what is the wavelength of the incident photon? Homework Equations \lambda' - \lambda_{o} = h/(Me*c)(1-cos\theta) The Attempt at a Solution We know that the maximum energy...

I was reading section 24 of Peebles "Principles of Physical Cosmology" where he analizes the impact of scattering by dust at redshifts z < 100 on the cosmic background radiation for an Einstein-deSitter universe. I was disappointed to find out that at the end of the subsection he concludes that...

hi, i am a new student here in this forums from uae and i am studing in uaeu my majore is general physics >>> in this corse i have problem in nuclier physics in rutherford scattering >>> can you help ma pleaseeeee the problem are : firest one is : Show that the distance of...

Hello, The problem I have is trying to derive a formula for the compton equation, but instead of having the electron at rest, it is moving in the same direction as the incident photon. I've tried deriving it in the same manner as deriving it for an electron at rest (ie. I've simply made the...

[b]1. Homework Statement [/b Robinett question One of my homework questions in the Compton scattering section asks: "Evaluate the fractional change in wavelength delta lambda/lamdba, for incident blue light and X-rays? It also gives the wavelength of blue light and X-rays. I do not know what...

I got the answer of the hw, but still have question about it. I need to calculate the scattering time μ = eτ / m. τ is the mean time. the unit needs to be in cm^2 / V.S I put the unit like this : e = coulumb τ = s m = kg then it's impossible to get the unit like that. Then I'm...

Hello, In Compton scattering, does the electron absorbs a photon and then emit another photon with another energy?? I couldn't understand how would the electron absorb a FRACTION of the photon's energy which is forbidden in QM. Regards

There is nowone who can help me on the homework forum, so i'll try it here...

Homework Statement We are interested in the solution of the Schrodinger equation with positive energy E = h_^2k^2/2m for the potential V(x) = -v_0*delta(x). We take the scattering state under the form Ae^ikx+Be^-ikx for x<0, and Ce^ikx+De^-ikx for x>0 Find the scattering matrix S(k)Homework...

For processes of particle decay and inelastic scattering, quantum field theory (QFT) predicts well the probabilities of various final states for given initial states. Technically, this is described by the S-matrix, which is the unitary-evolution matrix describing the transitions from t=-infinity...

Homework Statement A parallel beam of alpha particles with fixed kinetic energy is normally incident on a piece of gold foil. a) if 100 alpha particles per minute are detected at 20 degrees, how many will be counted at 40, 60, 80 and 100 degrees? b) If the kinetic energy of the incident...