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Further evidence for low-energy protonium production in vacuum

E. Lodi Rizzini, L Venturelli, N Zurlo, M Charlton, C Amsler, G Bonomi, C Canali, C Carraro, A Fontana, P Genova, R Hayano, L. V Jørgensen, A Kellerbauer, V Lagomarsino, R Landua, M Macrí, G Manuzio, P Montagna, C Regenfus, A Rotondi, G Testera, A Variola, D. P Werf, Michael Charlton, Dirk van der Werf Orcid Logo

The European Physical Journal Plus, Volume: 127, Issue: 10

Swansea University Authors: Michael Charlton, Dirk van der Werf Orcid Logo

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DOI (Published version): 10.1140/epjp/i2012-12124-9

Abstract

We describe an experiment performed in the ATHENA apparatus in which there is evidence that the antiproton-proton bound state, protonium, has been produced at very low energies in vacuum following the interaction of cold antiprotons with a trapped cloud of molecular hydrogen ions. The latter were co...

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Published in: The European Physical Journal Plus
ISSN: 2190-5444
Published: 2012
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URI: https://cronfa.swan.ac.uk/Record/cronfa13704
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The latter were confined in a centrifugally separated belt outside a positron plasma used for antihydrogen formation. Studies have been performed at low positron plasma temperatures in which the protonium annihilation signal has been identified along with that from antihydrogen, and we discuss how their contributions can be disentangled. With the positron plasma heated to around 10000K the ions become distributed in the positrons, and the majority of the annihilation signal can be explained in terms of protonium formation, as antihydrogen creation is heavily suppressed. In this case we compare the observed protonium formation ratewith expectations from theory and find reasonable accord, when experimental systematics are taken into account. 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spelling 2011-10-01T00:00:00.0000000 v2 13704 2012-12-16 Further evidence for low-energy protonium production in vacuum d9099cdd0f182eb9a1c8fc36ed94f53f Michael Charlton Michael Charlton true false 4a4149ebce588e432f310f4ab44dd82a 0000-0001-5436-5214 Dirk van der Werf Dirk van der Werf true false 2012-12-16 FGSEN We describe an experiment performed in the ATHENA apparatus in which there is evidence that the antiproton-proton bound state, protonium, has been produced at very low energies in vacuum following the interaction of cold antiprotons with a trapped cloud of molecular hydrogen ions. The latter were confined in a centrifugally separated belt outside a positron plasma used for antihydrogen formation. Studies have been performed at low positron plasma temperatures in which the protonium annihilation signal has been identified along with that from antihydrogen, and we discuss how their contributions can be disentangled. With the positron plasma heated to around 10000K the ions become distributed in the positrons, and the majority of the annihilation signal can be explained in terms of protonium formation, as antihydrogen creation is heavily suppressed. In this case we compare the observed protonium formation ratewith expectations from theory and find reasonable accord, when experimental systematics are taken into account. The effect on the annihilation signals of the passage of an electron current through a pre-loaded positron plasma has been studied in detail, and the results are presented here for the first time. Journal Article The European Physical Journal Plus 127 10 2190-5444 31 12 2012 2012-12-31 10.1140/epjp/i2012-12124-9 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2011-10-01T00:00:00.0000000 2012-12-16T17:40:32.2189154 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics E. Lodi Rizzini 1 L Venturelli 2 N Zurlo 3 M Charlton 4 C Amsler 5 G Bonomi 6 C Canali 7 C Carraro 8 A Fontana 9 P Genova 10 R Hayano 11 L. V Jørgensen 12 A Kellerbauer 13 V Lagomarsino 14 R Landua 15 M Macrí 16 G Manuzio 17 P Montagna 18 C Regenfus 19 A Rotondi 20 G Testera 21 A Variola 22 D. P Werf 23 Michael Charlton 24 Dirk van der Werf 0000-0001-5436-5214 25
title Further evidence for low-energy protonium production in vacuum
spellingShingle Further evidence for low-energy protonium production in vacuum
Michael Charlton
Dirk van der Werf
title_short Further evidence for low-energy protonium production in vacuum
title_full Further evidence for low-energy protonium production in vacuum
title_fullStr Further evidence for low-energy protonium production in vacuum
title_full_unstemmed Further evidence for low-energy protonium production in vacuum
title_sort Further evidence for low-energy protonium production in vacuum
author_id_str_mv d9099cdd0f182eb9a1c8fc36ed94f53f
4a4149ebce588e432f310f4ab44dd82a
author_id_fullname_str_mv d9099cdd0f182eb9a1c8fc36ed94f53f_***_Michael Charlton
4a4149ebce588e432f310f4ab44dd82a_***_Dirk van der Werf
author Michael Charlton
Dirk van der Werf
author2 E. Lodi Rizzini
L Venturelli
N Zurlo
M Charlton
C Amsler
G Bonomi
C Canali
C Carraro
A Fontana
P Genova
R Hayano
L. V Jørgensen
A Kellerbauer
V Lagomarsino
R Landua
M Macrí
G Manuzio
P Montagna
C Regenfus
A Rotondi
G Testera
A Variola
D. P Werf
Michael Charlton
Dirk van der Werf
format Journal article
container_title The European Physical Journal Plus
container_volume 127
container_issue 10
publishDate 2012
institution Swansea University
issn 2190-5444
doi_str_mv 10.1140/epjp/i2012-12124-9
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description We describe an experiment performed in the ATHENA apparatus in which there is evidence that the antiproton-proton bound state, protonium, has been produced at very low energies in vacuum following the interaction of cold antiprotons with a trapped cloud of molecular hydrogen ions. The latter were confined in a centrifugally separated belt outside a positron plasma used for antihydrogen formation. Studies have been performed at low positron plasma temperatures in which the protonium annihilation signal has been identified along with that from antihydrogen, and we discuss how their contributions can be disentangled. With the positron plasma heated to around 10000K the ions become distributed in the positrons, and the majority of the annihilation signal can be explained in terms of protonium formation, as antihydrogen creation is heavily suppressed. In this case we compare the observed protonium formation ratewith expectations from theory and find reasonable accord, when experimental systematics are taken into account. The effect on the annihilation signals of the passage of an electron current through a pre-loaded positron plasma has been studied in detail, and the results are presented here for the first time.
published_date 2012-12-31T03:15:39Z
_version_ 1763750277282791424
score 11.013619

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