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Naive Question :smile:

  1. Mar 9, 2008 #1
    If I have to send a beta particle in space and if the space is completely empty (from matter and energy just imagine!!!!)
    What would happen to the particle?
    If I put a very good GM in 1 Km from the source should I detect the beta particle if the beta particle has the power of 0.5 Mev?
    Dose the beta particle decomposition in the emptiness of the space and why (there is nothing in that space to absorb the beta particle.) should the beta particle just continue moving until it hits something that absorb it or not!!!!
    Sorry about my Q maybe it look like a naive Question :smile: but really believe me I never get a answer that make me rest.
    thank you all

    i post this to here after i post it else where so i will able to have two opinions
     
  2. jcsd
  3. Mar 9, 2008 #2

    mathman

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    Any particle traveling in a vacuum with no gravitational field will continue at a constant velocity. To effect a beta particle (electron) you need a gravitational or electromagnetic field or neutral stuff for a direct collision.
     
  4. Mar 9, 2008 #3
    no you don't understand the Q the beta particle WILL [decomposition or despairer] after few second or minutes WHY?????
     
  5. Mar 10, 2008 #4

    Astronuc

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    The beta particle (electron) is a fundamental particle, as far as we know. Somewhere is a proton (or ion) in search of an electron. Very likely the beta particle will find an ion and settle down as part of a neutral atom.
     
  6. Mar 10, 2008 #5
    but why the beta particle [decomposition or despairer] to other thing or to power after a [t]
    time
     
  7. Mar 10, 2008 #6

    mgb_phys

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    No the beta particle would continue pretty much for ever (depending on the cosmological model of the day)
    Neutrons interestingly decay in a few minutes if on their own outside a nucleas.
     
  8. Mar 12, 2008 #7
    maybe what is your source
     
  9. Mar 12, 2008 #8

    vanesch

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    An elementary course in physics ?

    Considering your question, there's not much of a dispute, you know: a beta particle (an electron) that has to fly for about 1 km to a detector through empty space will do so, no problem. Without interactions, as has been said before here, electrons don't decay within any reasonable time frame, and certainly not the few microseconds it will need to cross a kilometer.

    So, yes, you should detect it (if it is in the right direction of course). No, it will not decompose in a few microseconds (or a few centuries) in empty space.
     
  10. Mar 12, 2008 #9

    tiny-tim

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  11. Mar 16, 2008 #10
    Hey boys I understand that beta particle will decays after a very very very very VERY long time!!! But the main Q? The heart of my naïve Q is Why , just why the electron will decay after 4.6*10^26 yr
     
  12. Mar 16, 2008 #11
    and gays thank you all you were great...
     
  13. Mar 17, 2008 #12

    vanesch

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    Because it is tired of waiting? :tongue:

    Where do you get that number from ? I think it is manifestly wrong...
     
  14. Mar 17, 2008 #13

    tiny-tim

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    … maybe never decay … ?

    It's from http://en.wikipedia.org/wiki/Particle_decay.

    But, hagopbul, I think you should note that it says the mean lifetime is greater than 4.6*10^26 yr!

    In other words: I think people expect that electrons never decay - but it's only been proved that their mean lifetime must be at least 4.6*10^26 yr! :smile:
     
  15. Mar 17, 2008 #14

    vanesch

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    My fault. I thought that the shown electron life time was longer than the shown proton decay lifetime, which is beyond the 10^(31) years.
     
  16. Mar 27, 2008 #15
    Q???

    What I see now that no body understand the main Question maybe it is my fault
    What I am looking for that the electron is consist of two quark and gluon when the beta particle exist and speed in the space the two quarks start to move and squeeze the gluon between it, fig(1)

    The heart of my 1st Q was is this movement consume some of the kinetic power of beta particle so the particle will finally stop .
    1st I was thinking about the Newton laws that beta particle will move for ever in the empty space but I was thinking dose the movement of the quarks inside the electron will resist the movement of the electron it self and if not why ???. That was my 1st Q!!!!
    2nd the electron will finally decay (after 1 year) why ?? what is happening inside this electron that make this fundamental particle to decays
    Please forgive my ignorance I am knew to the particle and elementary particle physics

    see the attachment
     
  17. Mar 27, 2008 #16

    tiny-tim

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    A beta particle, or electron, does not consist of two quarks and a gluon. :frown:

    (What makes you think it does? :confused:)

    It's just an electron.
     
  18. Mar 27, 2008 #17
    protons and neutrons consist of 3 quarks and you are 100% right but what if that right
    because we see that the behavior of the e and the proton are the same except the mass
    and it is my mistake about the quarks
    but if the e don't consist of quarks then why it is decays after long long time[4.6*10^26 yr]
     
  19. Mar 27, 2008 #18
    and you are too fast that good
     
  20. Mar 27, 2008 #19
    it must never decays what ever hapened
     
  21. Mar 27, 2008 #20

    Astronuc

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    4.6*10^26 yr is essentially never for all intents and purposes. That number probably fits a model. I doubt anyone has observed the decay of an electron.
     
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