What is the threshold energy for gamma+e→3e and gamma→e⁺e⁻ reactions?

  • Thread starter Thread starter Starwanderer1
  • Start date Start date
  • Tags Tags
    Energy Threshold
Starwanderer1
Messages
17
Reaction score
0
Can someone help me out with this problem(not homework ofcourse)..

Find the threshold energy of gamma quantum required to form
- an electron-positron pair in the field of a stationary electron;
- a pair of pions of opposite signs in the field of a stationary proton..

Thank you for reading
 
Physics news on Phys.org
Use E^2-P^2=W^2, where W= total cm energy.
For gamma+e-->3e, this becomes (k+m)^2-k^2=(3m)^2.
 

Thread 'Toponium Discovered'

Toponium is a hadron which is the bound state of a valance top quark and a valance antitop quark. Oversimplified presentations often state that top quarks don't form hadrons, because they decay to bottom quarks extremely rapidly after they are created, leaving no time to form a hadron. And, the vast majority of the time, this is true. But, the lifetime of a top quark is only an average lifetime. Sometimes it decays faster and sometimes it decays slower. In the highly improbable case that...
View full post »

Thread 'Dirac-Delta from Normalization of Continuous Eigenfunctions'

I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
View full post »

Similar threads

I Lab energy available in threshold (endothermic) reactions
Replies
5
Views
3K
A Why KE of Annihilation Electrons Differs?
Replies
11
Views
2K
I 7Li(p,e+e−)8Be direct proton-capture reaction X17
Replies
7
Views
2K
A How to find the gamma function for a fermion vacuum energy calculation?
Replies
1
Views
2K
A Pair production without nucleus
Replies
13
Views
3K
I Is nuclear fusion induced by gamma photons possible?
Replies
18
Views
4K
B Radiation detector types/physics
Replies
24
Views
3K
I Nucleus energy levels, neutron energy
Replies
15
Views
3K
How to calculate gamma ray energies following beta decay?
Replies
12
Views
1K
I Gamma radiation, photon energies and wavelength question
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top