Annihilation of incompletely thermalized positronium studied by age-momentum correlation
Annihilation of incompletely thermalized positronium studied by age-momentum correlation
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DOI：
10.1016/0169-4332(94)00301-7
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发表时间：
1995-01
影响因子：
6.7
通讯作者：
H. Stoll;Markus Koch;U. Lauff;K. Maier;J. Major;H. Schneider;A. Seeger;A. Siegle
中科院分区：
文献类型：
--
作者：
H. Stoll;Markus Koch;U. Lauff;K. Maier;J. Major;H. Schneider;A. Seeger;A. Siegle
The dependence of the Doppler broadening of the 511 keV photon annihilation line of positrons annihilating in a variety of solid and liquids is studied as a function of the positron age (= time spent by the positrons in the sample between injection and annihilation) by age-momentum correlation (AMOC) measurements. At small positron ages an extra broadening of the momentum distribution of the annihilating positrondashelectron pairs is observed in all positronium-forming materials investigated (fused quartz, boron nitride, methanol, ndashhexane) but not in materials in which there is no evidence for positronium formation (Al, diamond, Al2O3). The “young-age broadening” is attributed to delayed thermalization of positronium atoms with kinetic energies of a few electron volts.
