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Creation of Matter

  1. Jun 4, 2015 #1
    Lets suppose we have a photon and it will gonna create a particle particle mass is ##16.10^-29## kg.I used ##E=mc^2## to find the solution and I found 90 MeV but the answer is 180 where did I made wrong.

    Thanks
     
    Last edited: Jun 4, 2015
  2. jcsd
  3. Jun 4, 2015 #2
    particle mass not clear
     
  4. Jun 4, 2015 #3

    Vanadium 50

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    If you don't show us the calculation, it will be very difficult to tell you where you went wrong.
     
  5. Jun 4, 2015 #4
    16.10^-29 kgxc^2 is equal 16x9x10^-13 joule=144x10^-13 joule I convert this MeV and I found 90 MeV but the answer is 180MeV
     
  6. Jun 4, 2015 #5

    ChrisVer

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    I guess because you need 2 particles at the end?
     
  7. Jun 4, 2015 #6
    you forget momentum conservation
     
  8. Jun 4, 2015 #7
    I thought we need two photons to create a particle but I am not sure
     
  9. Jun 4, 2015 #8
    Me ?
     
  10. Jun 4, 2015 #9
    yaa momentum conservation is must,
     
  11. Jun 4, 2015 #10
    So final Answer is we need two photon ??
     
  12. Jun 4, 2015 #11
    ye
    yes
     
  13. Jun 4, 2015 #12

    ChrisVer

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    I wasn't thinking about 2 photons...rather about 2 particles at the end...
    [itex]\gamma \rightarrow 1+2[/itex]
     
  14. Jun 4, 2015 #13
    But theres one particle
     
  15. Jun 4, 2015 #14

    ChrisVer

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    you can't get 1 massive particle from 1 photon....
    Simply because that would violate energy/momentum conservation. For the massive particle you can go to a frame where its momentum vanishes (rest frame)...at that frame, the photon's momentum can't be zero (because momentum=energy for photons, so you would get nothing), and you get a violation of energy/momentum...
     
  16. Jun 4, 2015 #15

    Vanadium 50

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    We are 15 messages into this, and we don't even have a clear idea on what the question is - people are still trying to guess.
     
  17. Jun 4, 2015 #16
    The question is we have one photon and it creates a particle we know particle mass but intersting thing is answer says photon energy is twice a particle energy why theres extra energy ?
     
  18. Jun 4, 2015 #17
    Thats make sense I thought feymann diagram we need one boson and two fermion to make a correct "feymann diagram" there cant be two boson and one fermion.So you are saying 180Mev will create two 90Mev particle or 180 Mev will create 90 Mev particle 90 Mev photon
     
  19. Jun 4, 2015 #18
    I found the answer I am so so sorry.
     
  20. Jun 4, 2015 #19

    Vanadium 50

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    Since that never happens on its own, that's clearly not the question.
     
  21. Jun 4, 2015 #20
    Yeah,the solution is photon makes matter and antimatter but for that we need two photon and two matter.Wait !! Can one photon create two particles ? Or we need at least two photon If we need at least two photon then the answer will be 90 MeV
     
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