Phys. Rev. Lett. 77, 2929–2932 (1996)Temperature Dependence of Positron Annihilation Rates in Noble GasesReceived 10 May 1996; published in the issue dated 30 September 1996 The dependence of positron annihilation rates on temperature has been measured for the noble gases. These measurements were carried out using a new technique which, for the first time, makes the positron energy range between kBT = 0.025 and 1 eV accessible to experiments. Positrons in a Penning trap are heated to about 1 eV, and then cool to room temperature by collisions while maintaining a Maxwellian velocity distribution. The positron annihilation rate is measured during the cooling. Experimental data are in good agreement with theoretical calculations. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.2929
DOI:
10.1103/PhysRevLett.77.2929
PACS:
36.10.Dr, 25.30.Hm, 71.60.+z, 78.70.Bj
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