Abstract
γ 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 γ spectra produced during positron cooling in noble gases. The γ spectra and their ¯S and ¯W 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.
| Original language | English |
|---|---|
| Article number | 203404 |
| Number of pages | 5 |
| Journal | Physical Review Letters |
| Volume | 119 |
| Issue number | 20 |
| Early online date | 16 Nov 2017 |
| DOIs | |
| Publication status | Published - 17 Nov 2017 |
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Positron cooling and annihilation in noble gases
Green, D. (Creator), Queen's University Belfast, 01 Sept 2017
DOI: 10.17034/9da6ab49-3a41-4042-90ed-f7e479d2f437
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