Probing Positron Cooling in Noble Gases via Annihilation γ Spectra

被引：8

作者：

Green, D. G. ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Math & Phys, Ctr Theoret Atom Mol & Opt Phys, Belfast BT7 1NN, Antrim, North Ireland

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

AGE-MOMENTUM CORRELATION; THERMALIZATION TIMES; SLOW POSITRONS; ATOMS; SCATTERING; SURFACES; ARGON;

D O I：

10.1103/PhysRevLett.119.203404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

gamma spectra for positron annihilation in noble-gas atoms are calculated using many-body theory for positron momenta up to the positronium-formation threshold. These data are used, together with time-evolving positron-momentum distributions determined in the preceding Letter [Phys. Rev. Lett. 119, 203403 (2017)], to calculate the time-varying. spectra produced during positron cooling in noble gases. The gamma spectra and their (S) over bar and (W) over bar shape parameters are shown to be sensitive probes of the time evolution of the positron momentum distribution and thus provide a means of studying positron cooling that is complementary to positron lifetime spectroscopy.

引用

页数：5

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