Abstract
Experimental values are presented for the andnihilation rates in gases of slow positrons that have failed to form positronium. The observed values for argon, methane, ethane, propane, n-butane, isobutane, and carbon tetrachloride are found to exceed the values derived from Dirac theory by factors of 3 to 700. A Na/sup 22/ positron source was used in a cylinder where the sample gases were at up to 10 atm. and a constant (25 plus or minus 5) deg C. The effects of molecular electric polarization are discussed. (R.E.U.)
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