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Gravitational effect on proton and antiproton

  1. Sep 7, 2005 #1
    hello friends,

    i want to know recent experimental works,journals on the topic "gravitational behavior of proton and antiproton.

  2. jcsd
  3. Sep 7, 2005 #2


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    Gold Member

    I suspect that there is little or none. At those scales, gravity is negligable compared to other forces and basically beyond detection.
  4. Sep 7, 2005 #3
    See the link below from, Momo Jeng, Department of Physics,University of California at Santa Barbara, momo@sbphy.ucsb.edu:


    And this link which cites a review paper on antigravity by John Eades' in the Jan 1, 1999 issue of 'Review of Modern Physics':


    I would also mention that the Brightsen nucleon cluster model predicts gravity and antigravity interactions, not between free protons and neutrons, but between mass asymmetrical nucleon clusters, such as matter [PNP] + antimatter [NP]--but this is just a proposed model, no experimental data at present to support such a claim.

    And, finally, the following experiment that will be conducted at CERN, which is from this site:


    EFFECT OF GRAVITY on antiprotons will be measured at the Low Energy
    Antiproton Ring (LEAR) of the European laboratory for particle physics
    (CERN). Antiprotons are extracted from LEAR at an energy of two million
    electron volts, decelerated to between 10,000 and 20,000 electron volts and
    captured in the catching trap and storage trap, where they are cooled to 10
    degrees Kelvin (-263 degrees Celsius). They are then launched, 100 at a
    time, up a one-meter-high drift tube. The antiprotons most useful to the
    experiment will have a starting velocity averaging four meters per second.
    As they drift upward the tug of gravity will slow them down. Hence the more
    energetic particles will reach the detector first and the less energetic
    ones will reach it later. There eventually will be a cutoff time after
    which no more particles will reach the detector because the slowest
    particles will not have enough speed to reach the region of the accelerating
    grid before their upward motion is overcome by gravity. The experiment will
    separately measure and compare the cutoff time both for antiprotons and for
    negative hydrogen ions (black curve), which have the same charge and almost
    the same mass as antiprotons. If antimatter were subject to a larger
    gravitational force downward than ordinary matter, the antiprotons would
    have a shorter cutoff time (colored curve) than the hydrogen.
  5. Sep 8, 2005 #4
    thanks rade

    hi rade,

    thanks for ur replay.i will catch u afterwards with a new query.

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