ANNIHILATION IN LOW-ENERGY POSITRON-HELIUM SCATTERING

Authors
VANREETH P HUMBERSTON JW IWATA K GREAVES RG SURKO CM
Citation
P. Vanreeth et al., ANNIHILATION IN LOW-ENERGY POSITRON-HELIUM SCATTERING, Journal of physics. B, Atomic molecular and optical physics, 29(12), 1996, pp. 465-471
Citations number
21
Categorie Soggetti
Physics, Atomic, Molecular & Chemical",Optics
Journal title
Journal of physics. B, Atomic molecular and optical physics → ACNP
ISSN journal
09534075
Volume
29
Issue
12
Year of publication
1996
Pages
465 - 471
Database
ISI
SICI code
0953-4075(1996)29:12<465:AILPS>2.0.ZU;2-M
Abstract
Elaborate wavefunctions representing low-energy positron-helium elasti c scattering, which were obtained in the course of calculating accurat e values of the scattering phase shifts, are used to determine the ele ctron-positron annihilation rate and the Doppler-broadened annihilatio n gamma-ray spectrum. This spectrum is also measured using room-temper ature positrons in a Penning trap and a non-Gaussian lineshape is obse rved for the first time. Excellent agreement is obtained between the t heoretical spectrum and the present results.