Production of slow protonium in vacuum

Zurlo, N.; Rizzini, E. Lodi; Venturelli, L.; Amoretti, M.; Carraro, C.; Lagomarsino, V.; Macrı́, M.; Manuzio, G.; Testera, G.; Variola, A.; Amsler, C.; Pruys, H.; Regenfus, C.; Bonomi, G.; Fontana, A.; Genova, P.; Montagna, P.; Rotondi, A.; Cesar, C. L.; Charlton, M.; Mitchard, D.; Jørgensen, L. V.; Madsen, N.; Werf, D. P. van der; Doser, M.; Kellerbauer, A.; Landua, R.; Funakoshi, R.; Hayano, R. S.; Posada, L. G. C.; Yamazaki, Y.

doi:10.1007/978-3-540-73466-6_13

Cited by 5 publications

(10 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to their H work, ATHENA has also reported observations consistent with the formation of low-energy protonium, Pn, the proton-p bound state [42,43]. Ongoing analyses of the relevant data, which include examination of spatial p annihilation distributions, encompass dynamical effects, which provide further motivation for our study.…”

Section: Introductionmentioning

confidence: 76%

Antiparticle cloud temperatures for antihydrogen experiments

et al. 2017

Self Cite

View full text Add to dashboard Cite

A simple rate-equation description of the heating and cooling of antiparticle clouds under conditions typical of those found in antihydrogen formation experiments is developed and analyzed. We include single-particle collisional, radiative, and cloud expansion effects and, from the modeling calculations, identify typical cooling phenomena and trends and relate these to the underlying physics. Some general rules of thumb of use to experimenters are derived.

show abstract

Section: Introductionmentioning

confidence: 76%

Antiparticle cloud temperatures for antihydrogen experiments

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The capabilities of the detector in the ATHENA apparatus have permitted detection of two other kinds of annihilations besides the H annihilations: hot spots [17] and protonium atoms [18,19]. The former correspond to annihilations of antiprotons in particular zones of the electrodes of the mixing trap, the latter to the annihilations of metastable protonantiproton systems formed by the interaction of antiprotons with molecular hydrogen ions of the residual gas in the mixing trap.…”

Section: The Experimentsmentioning

confidence: 99%

The mechanisms of antihydrogen formationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009

Self Cite

View full text Add to dashboard Cite

Some years have passed since the report of the first production of cold antihydrogen by the Athena Collaboration and the Atrap Collaboration at CERN, but no clear answer has been given about the roles of the two mechanisms responsible for antihydrogen formation. A new preliminary analysis of the data acquired by the Athena Collaboration in different experimental conditions seems to suggest that three-body recombination mechanism is dominant in the first tens of seconds of the overlapping of the injected antiproton cloud with the positron plasma in the nested Penning trap, while radiative capture starts to become dominant afterwards.Résumé : Il y a déjà plusieurs années que le groupe Athena et le groupe Atrap au CERN ont réussi à produire de l'antihydrogène froid, mais nous n'avons toujours pas de réponse claire sur le rôle exact des deux mécanisme responsables de la formation de l'anti-hydrogène. Une nouvelle analyse des données enregistrées par le groupe Athena, sous différentes conditions expérimentales, semble suggérer que le mécanisme de recombinaison à trois corps est dominant dans les premières dizaines de secondes du recouvrement du nuage d'anti-protons injectés avec le plasma de positrons dans le piège de Penning, alors que la capture radiative devient plus importante par la suite.[Traduit par la Rédaction]

show abstract

“…In particular, it doesn't take much imagination now to predict that lab-produced atoms with such bosonic "electrons" in place of the usual fermionic electrons are eventually going to become an experimental reality, although the path to their controlled production and storage is cluttered with enormous technical obstacles that need to be overcome. Yet such a feat should be possible, as demonstrated by the recent success story about storing anti-H atoms [HHetal12], and by the recent lab creation of "protonium" [Zetal06a,Zetal06b], an atom made of a proton and an anti-proton, both fermions.…”

Section: Introductionmentioning

confidence: 99%

The Hartree limit of Born's ensemble for the ground state of a bosonic atom or ion

Kiessling

2012

Journal of Mathematical Physics

View full text Add to dashboard Cite

Performance analysis of a micro-scaled quantum Stirling refrigeration cycle J. Appl. Phys. 112, 064908 (2012) How to recover Marcus theory with fewest switches surface hopping: Add just a touch of decoherence J. Chem. Phys. 137, 22A513 (2012) On nonlocal Gross-Pitaevskii equations with periodic potentials J. Math. Phys. 53, 073709 (2012) Dynamics of a two-level system coupled to a bath of spins J. Chem. Phys. 137, 22A504 (2012) Structural properties and energetics of diffuse 87Rb clusters in three-dimensionThe non-relativistic bosonic ground state is studied for quantum N-body systems with Coulomb interactions, modeling atoms or ions made of N "bosonic point electrons" bound to an atomic point nucleus of Z absolute "electron" charges, treated in Born-Oppenheimer approximation (the nuclear mass M = ∞). By adapting an argument of Hogreve, it is shown that the (negative) Bosonic ground state energy E B ∞ (Z , N ) yields the monotone non-decreasing function N → E B ∞ (λN , N )/N 3 for any λ > 0. The main part of the paper furnishes a proof that whenever λ ≥ λ * ≈ 1/1.21, then the limit ε(λ) := lim N →∞ E B ∞ (λN , N )/N 3 is governed by Hartree theory, and the rescaled bosonic ground state wave function factors into an infinite product of identical one-body wave functions determined by the Hartree equation. The proof resembles the construction of the thermodynamic mean-field limit of the classical ensembles with thermodynamically unstable interactions, except that here the ensemble is Born's, with |ψ| 2 as ensemble probability density function on R 3N , with the Fisher information functional in the variational principle for Born's ensemble playing the role of the negative Gibbs entropy functional in the free-energy variational principle for the classical petit-canonical configurational ensemble. C 2012 American Institute of Physics. [http://dx.

show abstract

Production of slow protonium in vacuum

Cited by 5 publications

References 27 publications

Antiparticle cloud temperatures for antihydrogen experiments

Antiparticle cloud temperatures for antihydrogen experiments

The mechanisms of antihydrogen formationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

The Hartree limit of Born's ensemble for the ground state of a bosonic atom or ion

Contact Info

Product

Resources

About