UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Production of a fully spin-polarized ensemble of positronium atoms

Cassidy, DB; Meligne, VE; Mills, AP; (2010) Production of a fully spin-polarized ensemble of positronium atoms. Physical Review Letters , 104 (17) , Article 173401. 10.1103/PhysRevLett.104.173401. Green open access

[thumbnail of 1362303.pdf]
Preview
PDF
1362303.pdf

Download (183kB)

Abstract

Long-lived |m|=1 positronium (Ps) atoms are produced in vacuum when high density bursts of positrons with net polarization p0 are implanted into a porous silica film in a 2.3 T magnetic field. We observe a decrease in the |m|=1 population as the density of the incident positron beam is increased due to quenching interactions between oppositely polarized Ps atoms within the target. Saturation of this density dependent quenching indicates that the initial positron spin polarization p0=28±1%, and demonstrates the long term (102s) survival of positron polarization in a Surko-type buffer gas trap. We conclude that, at high Ps densities, the minority spin component is essentially eliminated and the remaining Ps is almost entirely (∼96%) polarized, as required for the formation of a Ps Bose-Einstein condensate. © 2010 The American Physical Society.

Type: Article
Title: Production of a fully spin-polarized ensemble of positronium atoms
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.104.173401
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.104.173401
Language: English
Additional information: © 2010 The American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1362303
Downloads since deposit
131Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item