Resolution of the orthopositronium-lifetime puzzle.
Resolution of the orthopositronium-lifetime puzzle.
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DOI：
10.1103/physrevlett.90.203402
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发表时间：
2003-05
影响因子：
8.6
通讯作者：
R. Vallery;P. Zitzewitz;D. Gidley
中科院分区：
文献类型：
--
作者：
R. Vallery;P. Zitzewitz;D. Gidley
长期以来的矛盾[G]。S.阿德金斯河N. Fell和J. Sapirstein，Ann. Phys.（N.Y.）295，136（2002）]]之间的理论计算的正电子素（o-Ps）湮灭衰变率（λ（T）=1/寿命）和一些实验测量已经解决。一束聚焦的正电子入射到一种特殊的纳米多孔二氧化硅薄膜上，在真空中产生近热能o-Ps，这种能量足够慢，几乎没有扰动相互作用。拟合的衰减率只需要一个500 ppm的非热o-Ps效应的校正。λ（T）=7.0404（10）（8）μ s（-1）的新值与理论非常一致。
The long-standing discrepancy [G. S. Adkins, R. N. Fell, and J. Sapirstein, Ann. Phys. (N.Y.) 295, 136 (2002)]] between the theoretical calculations of the orthopositronium (o-Ps) annihilation decay rate (lambda(T)=1/lifetime) and some of the experimental measurements has been resolved. A focused beam of positrons incident on a special nanoporous silica film produces near-thermal energy o-Ps in vacuum that is slow enough to be virtually free of perturbing interactions. The fitted decay rate requires only a 500 ppm correction for nonthermal o-Ps effects. The new value of lambda(T)=7.0404(10)(8) micros(-1) is in excellent agreement with theory.