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CERN Document Server 33 elementer funnet  1 - 10nesteslutt  gå til element: Søket tok 0.78 sekunder. 
1.
Antihydrogen annihilation detection: the ALPHA-g radial TPC / Capra, A (TRIUMF) /ALPHA Collaboration
The recent measurement of the antihydrogen terrestrial gravitational acceleration with the ALPHA-g apparatus at CERN relies upon the detection of the annihilation of the anti-atoms that are released from their magnetic confinement and that move under the influence of gravity. The ALPHA-g magnetic trap is surrounded by a Time Projection Chamber designed to identify the annihilation products and to reconstruct the annihilation position. [...]
2025 - 10 p. - Published in : PoS EXA-LEAP2024 (2025) 063 Fulltext: PDF;
In : International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP 2024), Vienna, Austria, 26 - 30 Aug 2024, pp.063
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2.
The ALPHA-2 apparatus - facilitating experimentation with trapped antihydrogen / Akbari, R (British Columbia U.) ; Alves, B X R (Aarhus U.) ; Baker, C J (Swansea U.) ; Baquero-Ruiz, M (LPHE, Lausanne) ; Bertsche, W (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.) ; Butler, E (CERN) ; Burrows, C (Swansea U.) ; Capra, A (TRIUMF) ; Cesar, C L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) et al.
This paper describes the ALPHA-2 apparatus, used at the CERN Antiproton Decelerator facility for the study of trapped antihydrogen atoms. Details of both the construction and performance are included. [...]
2025 - 24 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1072 (2025) 170194 Fulltext: PDF;
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3.
Precision spectroscopy of the hyperfine components of the 1S–2S transition in antihydrogen / Baker, C J (Swansea U.) ; Bertsche, W (Manchester U. ; Daresbury) ; Capra, A (TRIUMF) ; Carruth, C (UC, Berkeley) ; Cesar, C L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) ; Christensen, A (UC, Berkeley) ; Collister, R (TRIUMF) ; Cridland Mathad, A (Swansea U.) ; Eriksson, S (Swansea U.) et al.
The antimatter equivalent of atomic hydrogen—antihydrogen—is an outstanding testbed for precision studies of matter–antimatter symmetry. Here we report on the simultaneous observation of both accessible hyperfine components of the 1S–2S transition in trapped antihydrogen. [...]
2025 - 7 p. - Published in : Nature Phys. 21 (2025) 201-207 Fulltext: PDF;
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4.
Quality Assurance and Quality Control of the $26~\text{m}^2$ SiPM production for the DarkSide-20k dark matter experiment / DarkSide-20k Collaboration
DarkSide-20k is a novel liquid argon dark matter detector currently under construction at the Laboratori Nazionali del Gran Sasso (LNGS) of the Istituto Nazionale di Fisica Nucleare (INFN) that will push the sensitivity for Weakly Interacting Massive Particle (WIMP) detection into the neutrino fog. [...]
arXiv:2412.18867. -
Fulltext
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5.
Adiabatic expansion cooling of antihydrogen / ALPHA Collaboration
Magnetically trapped antihydrogen atoms can be cooled by expanding the volume of the trap in which they are confined. We report a proof-of-principle experiment in which antiatoms are deliberately released from expanded and static traps. [...]
2024 - 6 p. - Published in : Phys. Rev. Res. 6 (2024) L032065 Fulltext: PDF;
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6.
Measurements of Penning-Malmberg trap patch potentials and associated performance degradation / ALPHA Collaboration
Antiprotons created by laser ionization of antihydrogen are observed to rapidly escape the ALPHA trap. Further, positron plasmas heat more quickly after the trap is illuminated by laser light for several hours. [...]
2024 - 8 p. - Published in : Phys. Rev. Res. 6 (2024) L012008 Fulltext: PDF;
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7.
Observation of the effect of gravity on the motion of antimatter / ALPHA Collaboration
Einstein’s general theory of relativity from 19151 remains the most successful description of gravitation. From the 1919 solar eclipse2 to the observation of gravitational waves3, the theory has passed many crucial experimental tests. [...]
2023 - 23 p. - Published in : Nature 621 (2023) 716-722 Fulltext: PDF; External links: Space.com article; CERN News article; ScienceNews article; Interactions.org article; Physics article; ScienceAlert article; Phys.org article; SciTechDaily article; Physics World article; New York Times article; symmetry magazine article
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8.
Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment / ALPHA Collaboration
The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. [...]
arXiv:2211.09838.- 2023-04-03 - 15 p. - Published in : Phys. Rev. Accel. Beams 26 (2023) 040101 Fulltext: 2211.09838 - PDF; Publication - PDF;
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9.
Sensitivity projections for a dual-phase argon TPC optimized for light dark matter searches through the ionization channel / Global Argon Dark Matter Collaboration
Dark matter lighter than 10 GeV/c$^2$ encompasses a promising range of candidates. A conceptual design for a new detector, DarkSide-LowMass, is presented, based on the DarkSide-50 detector and progress toward DarkSide-20k, optimized for a low-threshold electron-counting measurement. [...]
arXiv:2209.01177.- 2023-06-01 - 19 p. - Published in : Phys. Rev. D 107 (2023) 112006 Fulltext: 2209.01177 - PDF; 91ce6168799b33f720d8ae133fe8e56d - PDF; 7ede44e631b65e81b189ef9ecc6a4614 - PDF; External link: Fermilab Accepted Manuscript
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10.
Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production / Baker, C J (Swansea U.) ; Bertsche, W (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Capra, A (TRIUMF) ; Cesar, C L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) ; Mathad, A Cridland (Swansea U.) ; Eriksson, S (Swansea U.) ; Evans, A (Calgary U.) ; Evetts, N (British Columbia U.) ; Fabbri, S (Manchester U.) et al.
The positron, the antiparticle of the electron, predicted by Dirac in 1931 and discovered by Anderson in 1933, plays a key role in many scientific and everyday endeavours. Notably, the positron is a constituent of antihydrogen, the only long-lived neutral antimatter bound state that can currently be synthesized at low energy, presenting a prominent system for testing fundamental symmetries with high precision. [...]
2021 - 8 p. - Published in : Nature Commun. 12 (2021) 6139 Fulltext: PDF;
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6 Capra, A.
1 Capra, Alessandro
3 Capra, Andrea
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