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Thread: Positronium

  1. #1 Positronium 
    Forum Sophomore Tharghana's Avatar
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    I was wandering how exactly Positronium is created, and also how it would act on a large Scale?


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  3. #2 Re: Positronium 
    . DrRocket's Avatar
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    Quote Originally Posted by Tharghana
    I was wandering how exactly Positronium is created, and also how it would act on a large Scale?
    http://positron.physik.uni-halle.de/...sitronium.html
    http://en.wikipedia.org/wiki/Positronium

    Given the decay times noted in the Wiki article I don't think you need to worry about positronium on a large scale. But since you are talking about a matter anti-matter structure, if you somehow managed to get a significant amount of it, the almost instantaneous decay ought to be one hell of an explosion -- it make a thermonuclear bomb look like a firecracker.

    These folks made positronium by bombarding silica with positrons.

    http://www.physorg.com/news108822085.html

    Atomic positronium seems to be a natural step in the decay process of a positron.
    http://www.physorg.com/news108822085.html


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    Forum Sophomore Tharghana's Avatar
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    So is there no way to make the Positronium Stable, cause from what I understand the Positron replaces the Proton right?
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  5. #4  
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    Quote Originally Posted by Tharghana
    So is there no way to make the Positronium Stable, cause from what I understand the Positron replaces the Proton right?
    It is an electron and an anti-electron. I have no idea how you would stabilize it. It is what it is. It is not like a chemical compound to which you can add a stabilizer. In a normal substance the atoms are held apart by the electron clouds and bound together by quantum mechanical electron bonds. Here you have a particle and an anti-particle dong a quantum dance with each other. It you had a bunch of these critters the matter and anti-matter would certainly interact and BOOM. As it is, even with just one positronium "atom" it decays and the particles annihilate pretty quickly. It is hard to imagine any substance that would be more unstable than one that is an equal mix of matter and anti-matter.
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  6. #5  
    Forum Professor leohopkins's Avatar
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    Quote Originally Posted by Tharghana
    So is there no way to make the Positronium Stable, cause from what I understand the Positron replaces the Proton right?
    No - the positron is an electron with an opposite charge.
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  7. #6  
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    Quote Originally Posted by leohopkins
    Quote Originally Posted by Tharghana
    So is there no way to make the Positronium Stable, cause from what I understand the Positron replaces the Proton right?
    No - the positron is an electron with an opposite charge.
    The positron has the mass of an electron with a positive charge. It is the anti-particle to the electron. When a positron meetsn an electron they annihilate one another and release energy in the form of a photon.

    Positronium is an electron and a positron orbiting one another.
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  8. #7  
    Forum Professor leohopkins's Avatar
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    Quote Originally Posted by DrRocket
    Quote Originally Posted by leohopkins
    Quote Originally Posted by Tharghana
    So is there no way to make the Positronium Stable, cause from what I understand the Positron replaces the Proton right?
    No - the positron is an electron with an opposite charge.
    The positron has the mass of an electron with a positive charge. It is the anti-particle to the electron. When a positron meetsn an electron they annihilate one another and release energy in the form of a photon.

    Positronium is an electron and a positron orbiting one another.
    That is interesting. What stops them annihalating ?
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  9. #8  
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    Quote Originally Posted by leohopkins
    Quote Originally Posted by DrRocket
    Quote Originally Posted by leohopkins
    Quote Originally Posted by Tharghana
    So is there no way to make the Positronium Stable, cause from what I understand the Positron replaces the Proton right?
    No - the positron is an electron with an opposite charge.
    The positron has the mass of an electron with a positive charge. It is the anti-particle to the electron. When a positron meetsn an electron they annihilate one another and release energy in the form of a photon.

    Positronium is an electron and a positron orbiting one another.
    That is interesting. What stops them annihalating ?
    Not much. Look at the lifetimes. They seem to "orbit" one another for a short time and then annihilate.
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