Nonradiative annihilation of a positron on bound electrons

doi:10.1103/PhysRevA.101.042707

	Nonradiative annihilation of a positron on bound electrons
	Najjari, B.1; Zhang, S. F.1; Ma, X.1; Voitkiv, A. B.2
刊名	PHYSICAL REVIEW A
	2020-04-27
卷号	101 期号:4 页码:9
ISSN号	2469-9926
DOI	10.1103/PhysRevA.101.042707
通讯作者	Najjari, B.()
英文摘要	We consider nonradiative annihilation of a positron on electrons bound by the field of a heavy nucleus. This process proceeds via the interaction of the annihilating positron-electron pair with another bound electron which is emitted carrying away the energy release. We present a fully relativistic treatment of this process which employs exact Dirac wave functions to describe the motion of the leptons in the nuclear field and regards the interaction between the leptons as a perturbation. We calculate the total cross section for this process for a number of elements ranging from silver to fermium. Our results substantially deviate from those previously reported in the literature, both for the absolute values of the cross section and its dependence on the energy of the incident positron. However, when we combine our results and the principle of detailed balance to get the cross section for the inverse process (so-called negative-continuum dielectronic recombination), a very good agreement is found with the existing results obtained by direct calculations. We also compare nonradiative annihilation with radiative annihilation proceeding with emission of a single photon and show that the cross sections for the former are much smaller.
资助项目	National Key Research and Development Program of China[2017YFA0402300] ; CAS President's International Fellowship Initiative ; German Research Foundation (DFG)[349581371] ; German Research Foundation (DFG)[1278/4-1]
WOS研究方向	Optics ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000528779800008
资助机构	National Key Research and Development Program of China ; CAS President's International Fellowship Initiative ; German Research Foundation (DFG)
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/140510]
专题	中国科学院近代物理研究所
通讯作者	Najjari, B.
作者单位	1.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 2.Heinrich Heine Univ Dusseldorf, Inst Theoret Phys 1, Univ Str 1, D-40225 Dusseldorf, Germany
推荐引用方式 GB/T 7714	Najjari, B.,Zhang, S. F.,Ma, X.,et al. Nonradiative annihilation of a positron on bound electrons[J]. PHYSICAL REVIEW A,2020,101(4):9.
APA	Najjari, B.,Zhang, S. F.,Ma, X.,&Voitkiv, A. B..(2020).Nonradiative annihilation of a positron on bound electrons.PHYSICAL REVIEW A,101(4),9.
MLA	Najjari, B.,et al."Nonradiative annihilation of a positron on bound electrons".PHYSICAL REVIEW A 101.4(2020):9.