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Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays

The ASACUSA antihydrogen setup at the CERN Antiproton Decelerator (AD) consists of an antihydrogen source (cusp magnet coupled to a positron source and an antiproton catching magnet) followed by a spectrometer beamline. After production in the cusp, the antihydrogen atoms decay while they escape the...

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Detalles Bibliográficos
Autores principales: Lundmark, R, Malbrunot, C, Nagata, Y, Radics, B, Sauerzopf, C, Widmann, E
Lenguaje:eng
Publicado: IOP 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1088/0953-4075/48/18/184001
http://cds.cern.ch/record/2710800
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author Lundmark, R
Malbrunot, C
Nagata, Y
Radics, B
Sauerzopf, C
Widmann, E
author_facet Lundmark, R
Malbrunot, C
Nagata, Y
Radics, B
Sauerzopf, C
Widmann, E
author_sort Lundmark, R
collection CERN
description The ASACUSA antihydrogen setup at the CERN Antiproton Decelerator (AD) consists of an antihydrogen source (cusp magnet coupled to a positron source and an antiproton catching magnet) followed by a spectrometer beamline. After production in the cusp, the antihydrogen atoms decay while they escape the trap leading to changes in their effective magnetic moment which in turn affect their trajectories in the beamline. Those sequential decays in the presence of a varying magnetic field strength from their production point in the cusp to their detection at the end of the spectrometer line can in principle greatly affect the prospects for a precision measurement of the antihydrogen hyperfine splitting given the so-far relatively low number of available anti-atoms. The impact of the antihydrogen decay in this context has for the first time been simulated. The implementation of atomic radiative decay has been done in Geant4 to extend the particle tracking capabilities originally embedded in Geant4 to excited atoms, and to allow studies of the effect of dynamic atomic properties on trajectories. This new tool thus allows the study of particle–matter interaction via the Geant4 toolkit while properly taking into account the atomic nature of the object under study. The implementation as well as impacts on the experimental sensitivity for antihydrogen spectroscopy are discussed in this paper.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
publisher IOP
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spelling oai-inspirehep.net-14884502022-08-10T13:07:23Zdoi:10.1088/0953-4075/48/18/184001http://cds.cern.ch/record/2710800engLundmark, RMalbrunot, CNagata, YRadics, BSauerzopf, CWidmann, ETowards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decaysPhysics in GeneralThe ASACUSA antihydrogen setup at the CERN Antiproton Decelerator (AD) consists of an antihydrogen source (cusp magnet coupled to a positron source and an antiproton catching magnet) followed by a spectrometer beamline. After production in the cusp, the antihydrogen atoms decay while they escape the trap leading to changes in their effective magnetic moment which in turn affect their trajectories in the beamline. Those sequential decays in the presence of a varying magnetic field strength from their production point in the cusp to their detection at the end of the spectrometer line can in principle greatly affect the prospects for a precision measurement of the antihydrogen hyperfine splitting given the so-far relatively low number of available anti-atoms. The impact of the antihydrogen decay in this context has for the first time been simulated. The implementation of atomic radiative decay has been done in Geant4 to extend the particle tracking capabilities originally embedded in Geant4 to excited atoms, and to allow studies of the effect of dynamic atomic properties on trajectories. This new tool thus allows the study of particle–matter interaction via the Geant4 toolkit while properly taking into account the atomic nature of the object under study. The implementation as well as impacts on the experimental sensitivity for antihydrogen spectroscopy are discussed in this paper.IOPoai:inspirehep.net:14884502015
spellingShingle Physics in General
Lundmark, R
Malbrunot, C
Nagata, Y
Radics, B
Sauerzopf, C
Widmann, E
Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
title Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
title_full Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
title_fullStr Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
title_full_unstemmed Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
title_short Towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
title_sort towards a precise measurement of the antihydrogen ground state hyperfine splitting in a beam: the case of in-flight radiative decays
topic Physics in General
url https://dx.doi.org/10.1088/0953-4075/48/18/184001
http://cds.cern.ch/record/2710800
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