High rate production of antihydrogen

Amoretti, M.; Amsler, C.; Bazzano, G.; Bonomi, G.; Bouchta, A.; Bowe, P. D.; Carraro, C.; Cesar, C. L.; Charlton, M.; Doser, M.; Filippini, V.; Fontana, A.; Fujiwara, M.; Funakoshi, R.; Genova, P.; Hangst, J. S.; Hayano, R.; Jørgensen, L. V.; Lagomarsino, V.; Landua, R.; Lindelöf, D.; Rizzini, E. Lodi; Macrı́, M.; Madsen, N.; Manuzio, G.; Marchesotti, M.; Montagna, P.; Pruys, H.; Regenfus, C.; Riedler, P.; Rotondi, A.; Rouleau, G.; Testera, G.; Variola, A.; Werf, D. P. van der

doi:10.1016/j.physletb.2003.10.062

Cited by 81 publications

(56 citation statements)

References 10 publications

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“…Even though all the distributions are broadened by the uncertainty in the vertex reconstruction, it is clear that two different structures are merged in cold mixing case, while in hot mixing just one appears. For the cold mixing, besides the annihilations on the trap wall situated at r = 1.25 cm due mainly toH (as shown in [12]) and having a relatively wider z-distribution [10], there are some annihilations situated at smaller r and with a very sharp z-distribution (see also Fig.5b). For hot mixing only the latter are present, though their axial distribution is broader, as is the radial distribution (see also Fig.4a,b).…”

Section: Resultsmentioning

confidence: 99%

“…It was shown in [12] that, when the e + cloud was kept at the trap environment cryogenic temperature of ∼ 15 K (a situation called "cold mixing" hereafter), annihilations were mainly due toH, even if some annihilations near the trap axis were present (see also Fig.1a). On the contrary, when the e + cloud was heated (by a radio-frequency drive applied to an electrode of the trap [13,14]) to a temperature, T e , of several thousand K (about 8000 K for the data reported here, which we call "hot mixing" hereafter)H formation was strongly suppressed [15] andps annihilated mainly without formingH (see also Fig.1b).…”

Section: Methodsmentioning

confidence: 99%

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Production of slow protonium in vacuum

Zurlo¹,

Rizzini²,

Venturelli³

et al. 2007

TCP 2006

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We describe how protonium, the quasi-stable antiproton-proton bound system, has been synthesized following the interaction of antiprotons with the molecular ion H + 2 in a nested Penning trap environment. From a careful analysis of the spatial distributions of antiproton annihilation events in the ATHENA experiment, evidence is presented for protonium production with sub-eV kinetic energies in states around n = 70, with low angular momenta. This work provides a new 2-body system for study using laser spectroscopic techniques.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Production of slow protonium in vacuum

Zurlo¹,

Rizzini²,

Venturelli³

et al. 2007

TCP 2006

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“…A key point is that the antihydrogen formation will happen within a short time (of the order of 1 µs). This "pulsed production scheme" strongly differs from the existing schemes where the antihydrogen is produced during long time intervals (seconds in the ATHENA experiment) [8].…”

Section: Pulsed Cold Antihydrogen Formationmentioning

confidence: 86%

Formation Of A Cold Antihydrogen Beam in AEGIS For Gravity Measurements

Testera¹,

Белов²,

Bonomi³

et al. 2008

AIP Conference Proceedings

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Abstract. The formation of the antihydrogen beam in the AEGIS experiment through the use of inhomogeneous electric fields is discussed and simulation results including the geometry of the apparatus and realistic hypothesis about the antihydrogen initial conditions are shown. The resulting velocity distribution matches the requirements of the gravity experiment. In particular it is shown that the inhomogeneous electric fields provide radial cooling of the beam during the acceleration.

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“…Antihydrogen formation by three-body recombination is a well-established method that has been demonstrated to create H at high rate [17]. As mentioned above, AEGIS will make use of an alternative technique which involves Ps as precursor [18].…”

Section: Production Of Antihydrogen By Resonant Charge Exchangementioning

confidence: 99%

Probing antimatter gravity – The AEGIS experiment at CERN

Kellerbauer¹,

Aghion²,

Amsler³

et al. 2016

EPJ Web Conf.

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Abstract. The weak equivalence principle states that the motion of a body in a gravitational field is independent of its structure or composition. This postulate of general relativity has been tested to very high precision with ordinary matter, but no relevant experimental verification with antimatter has ever been carried out. The AEGIS experiment will measure the gravitational acceleration of antihydrogen to ultimately 1% precision. For this purpose, a pulsed horizontal antihydrogen beam with a velocity of several 100 m s −1 will be produced. Its vertical deflection due to gravity will be detected by a setup consisting of material gratings coupled with a position-sensitive detector, operating as a moiré deflectometer or an atom interferometer. The AEGIS experiment is installed at CERN's Antiproton Decelerator, currently the only facility in the world which produces copious amounts of low-energy antiprotons. The construction of the setup has been going on since 2010 and is nearing completion. A proof-of-principle experiment with antiprotons has demonstrated that the deflection of antiparticles by a few μm due to an external force can be detected. Technological and scientific development pertaining to specific challenges of the experiment, such as antihydrogen formation by positronium charge exchange or the position-sensitive detection of antihydrogen annihilations, is ongoing.

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High rate production of antihydrogen

Abstract: We show that antihydrogen production is the dominant process when mixing antiprotons and positrons in the ATHENA apparatus, and that the initial production rate exceeds 300 Hz, decaying to 30 Hz within 10 s. A fraction of 65% of all observed annihilations is due to antihydrogen

Cited by 81 publications

References 10 publications

Production of slow protonium in vacuum

Production of slow protonium in vacuum

Formation Of A Cold Antihydrogen Beam in AEGIS For Gravity Measurements

Probing antimatter gravity – The AEGIS experiment at CERN

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