氦对正电子偶素的低能猝灭
Low-energy quenching of positronium by helium
摘要：
本文研究了氦原子对正电子偶素的极低能散射，利用模型交换势同时研究了弹性截面和拾取猝灭率。本计算方案在与Skalsey等人的测量横截面一致的同时，成功地再现了参数$^ 1Z_{\makebox{eff}}$，即相对于正电子处于单重态的每个原子的有效电子数。再加上这个模型的潜力也导致了协议与测量的介质能量截面的这个系统，这项研究似乎解决了长期存在的差异，在低能量之间的不同的理论计算和实验测量。
英文摘要：
Very low-energy scattering of orthopositronium by helium has been investigated for simultaneous study of elastic cross section and pick-off quenching rate using a model exchange potential. The present calculational scheme, while agrees with the measured cross section of Skalsey et al, reproduces successfully the parameter $^ 1Z_{\makebox{eff}}$, the effective number of electrons per atom in a singlet state relative to the positron. Together with the fact that this model potential also leads to an agreement with measured medium energy cross sections of this system, this study seems to resolve the long-standing discrepancy at low energies among different theoretical calculations and experimental measurements.
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