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CERN Document Server 50 records found  1 - 10próximoend  jump to record: Search took 0.56 seconds. 
1.
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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2.
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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3.
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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4.
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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5.
Report of the Topical Group on Physics Beyond the Standard Model at Energy Frontier for Snowmass 2021 / Bose, Tulika (Wisconsin U., Madison) ; Boveia, Antonio (Ohio State U., CCAPP) ; Doglioni, Caterina (Manchester U.) ; Griso, Simone Pagan (LBNL, Berkeley ; Sao Paulo, IFT) ; Hirschauer, James (Fermilab) ; Lipeles, Elliot (Pennsylvania U.) ; Liu, Zhen (Minnesota U.) ; Shah, Nausheen R. (Wayne State U.) ; Wang, Lian-Tao (Chicago U., EFI ; Chicago U., KICP) ; Agashe, Kaustubh (Maryland U.) et al.
This is the Snowmass2021 Energy Frontier (EF) Beyond the Standard Model (BSM) report. [...]
arXiv:2209.13128 ; FERMILAB-FN-1204-AD-QIS-SCD. - 108.
Fermilab Library Server - eConf - Fulltext - Fulltext
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6.
Positron accumulation in the GBAR experiment / GBAR Collaboration
We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (H+), which has been cooled to a low temperature, and observing the subsequent H annihilation following free fall. [...]
arXiv:2205.04530.- 2022-07-25 - 28 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1040 (2022) 167263 Fulltext: PDF;
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7.
Filtered Baryogenesis / Baker, Michael J. (Melbourne U.) ; Breitbach, Moritz (U. Mainz, PRISMA) ; Kopp, Joachim (CERN ; U. Mainz, PRISMA) ; Mittnacht, Lukas (U. Mainz, PRISMA) ; Soreq, Yotam (Technion)
We propose a new mechanism to simultaneously explain the observed dark matter abundance and the baryon asymmetry of the Universe. The mechanism is based on the Filtered Dark Matter scenario, where dark matter particles acquire a large mass during a first-order phase transition. [...]
arXiv:2112.08987; CERN-TH-2021-219.- 2022-08-01 - 32 p. - Published in : JHEP 2208 (2022) 010 Fulltext: 2112.08987 - PDF; document - PDF;
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8.
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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9.
Detailed Calculation of Primordial Black Hole Formation During First-Order Cosmological Phase Transitions / Baker, Michael J. (Melbourne U.) ; Breitbach, Moritz (Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Kopp, Joachim (Mainz U., Inst. Phys. ; U. Mainz, PRISMA ; CERN) ; Mittnacht, Lukas (Mainz U., Inst. Phys. ; U. Mainz, PRISMA)
We recently presented a new mechanism for primordial black hole formation during a first-order phase transition in the early Universe, which relies on the build-up of particles which are predominantly reflected from the advancing bubble wall. [...]
arXiv:2110.00005 ; CERN-TH-2021-113 ; MITP-21-036. - 33 p.
Fulltext
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10.
Primordial Black Holes from First-Order Cosmological Phase Transitions / Baker, Michael J. (U. Melbourne (main)) ; Breitbach, Moritz (U. Mainz, PRISMA ; Mainz U., Inst. Phys.) ; Kopp, Joachim (U. Mainz, PRISMA ; Mainz U., Inst. Phys. ; CERN) ; Mittnacht, Lukas (U. Mainz, PRISMA)
We discuss the possibility of forming primordial black holes during a first-order phase transition in the early Universe. [...]
arXiv:2105.07481 ; CERN-TH-2021-079 ; MITP-21-023. - 7 p.
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Veja também: nomes de autores similares
1 Baker, J A
1 Baker, J B
22 Baker, J C
9 Baker, J D
10 Baker, J E
17 Baker, J G
1 Baker, J K
4 Baker, J M
5 Baker, J R
1 Baker, J T
1 Baker, Jacob R
1 Baker, James A
1 Baker, James E
1 Baker, James R
2 Baker, Jeff
1 Baker, Jennifer C
1 Baker, Jessica
2 Baker, Jim
1 Baker, Joan
5 Baker, Joanne
1 Baker, Joe
4 Baker, John
29 Baker, John G
1 Baker, John M
1 Baker, Jr, William H
1 Baker, Justin T
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