FORMAL CALCULATION OF THE PICK-OFF ANNIHILATION RATE FOR ORTHOPOSITRONIUM AND PARAPOSITRONIUM
FORMAL CALCULATION OF THE PICK-OFF ANNIHILATION RATE FOR ORTHOPOSITRONIUM AND PARAPOSITRONIUM
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DOI：
10.1103/physrevb.43.10036
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发表时间：
1991-05-01
影响因子：
3.7
通讯作者：
ROLANDO, A
中科院分区：
文献类型：
--
作者：
DUPASQUIER, A;DENATALE, P;ROLANDO, A
物质中正电子素原子的湮灭通常被描述为通过两种替代途径发生：自湮灭（涉及原子本身的电子）和拾取湮灭（涉及外部电子）。 多年来，人们一直在争论假设正正电子素和对正电子素具有相同的拾取湮灭率是否正确。 我们通过正式计算来解决这个问题，该计算充分考虑了该过程中涉及的所有电子的自旋变量以及电子的不可区分性。 根据我们的结果，我们明确了导致定义与正电子素原子自旋状态无关的拾取率的条件。
The annihilation of a positronium atom in matter is often described as occurring through two alternative channels; self-annihilation (involving the electron in the atom itself) and pick-off annihilation (involving an external electron). For many years it has been debated if it is correct to assume the same pick-off annihilation rate for orthopositronium and for parapositronium. We address this problem with a formal calculation that takes into full account the spin variables of all the electrons involved in the process as well as the indistinguishability of the electrons. On the basis of our results, we make clear the conditions leading to a definition of the pick-off rate independent of the spin state of the positronium atom.