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Conference Paper: Observation of positronium spin rotation with silica aerogel

TitleObservation of positronium spin rotation with silica aerogel
Authors
Issue Date1995
PublisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.net
Citation
Materials Science Forum, 1995, v. 175-178 pt 2, p. 671-674 How to Cite?
AbstractPositronium (Ps) atoms in a magnetic field have their spins precessing about the magnetic field direction with precessional frequencies given by the energy difference between the various eigenstates of positronium in a magnetic field. Since positrons emitted from beta decay are polarized along the direction of their velocities, the density matrix describing positronium atoms at the instant of positronium formation in a magnetic field has nonzero coherence terms. These nonzero off-diagonal elements of the density matrix give rise to time oscillations of the annihilation amplitude, and hence the cross section for 3 γ decay of positronium at the Bohr frequencies [1]. In this experimental study, we describe a simple system for observing these oscillations with the aim of gaining a better understanding of the phenomenon of positronium spin rotation and to verify the results, as reported in [2], with silica aerogel in vacuum as a source of positronium atoms.
Persistent Identifierhttp://hdl.handle.net/10722/109771
ISSN
2005 Impact Factor: 0.399

 

DC FieldValueLanguage
dc.contributor.authorFan, Sen_HK
dc.contributor.authorBeling, CDen_HK
dc.contributor.authorFung, Sen_HK
dc.date.accessioned2010-09-26T01:36:34Z-
dc.date.available2010-09-26T01:36:34Z-
dc.date.issued1995en_HK
dc.identifier.citationMaterials Science Forum, 1995, v. 175-178 pt 2, p. 671-674en_HK
dc.identifier.issn0255-5476en_HK
dc.identifier.urihttp://hdl.handle.net/10722/109771-
dc.description.abstractPositronium (Ps) atoms in a magnetic field have their spins precessing about the magnetic field direction with precessional frequencies given by the energy difference between the various eigenstates of positronium in a magnetic field. Since positrons emitted from beta decay are polarized along the direction of their velocities, the density matrix describing positronium atoms at the instant of positronium formation in a magnetic field has nonzero coherence terms. These nonzero off-diagonal elements of the density matrix give rise to time oscillations of the annihilation amplitude, and hence the cross section for 3 γ decay of positronium at the Bohr frequencies [1]. In this experimental study, we describe a simple system for observing these oscillations with the aim of gaining a better understanding of the phenomenon of positronium spin rotation and to verify the results, as reported in [2], with silica aerogel in vacuum as a source of positronium atoms.en_HK
dc.languageengen_HK
dc.publisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.neten_HK
dc.relation.ispartofMaterials Science Forumen_HK
dc.titleObservation of positronium spin rotation with silica aerogelen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailBeling, CD: cdbeling@hkucc.hku.hken_HK
dc.identifier.emailFung, S: sfung@hku.hken_HK
dc.identifier.authorityBeling, CD=rp00660en_HK
dc.identifier.authorityFung, S=rp00695en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0029232594en_HK
dc.identifier.hkuros3301en_HK
dc.identifier.volume175-178en_HK
dc.identifier.issuept 2en_HK
dc.identifier.spage671en_HK
dc.identifier.epage674en_HK
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridFan, S=55429574800en_HK
dc.identifier.scopusauthoridBeling, CD=7005864180en_HK
dc.identifier.scopusauthoridFung, S=7201970040en_HK

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