Antihydrogen accumulation for fundamental symmetry tests

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Ahmadi, M, Alves, BXR, Baker, CJ, Bertsche, W, Butler, E, Capra, A, Carruth, C, Cesar, CL, Charlton, M, Cohen, S et al (show 44 more authors) , Collister, R, Eriksson, S, Evans, A, Evetts, N, Fajans, J, Friesen, T, Fujiwara, MC, Gill, DR, Gutierrez, A, Hangst, JS, Hardy, WN, Hayden, ME, Isaac, CA, Ishida, A, Johnson, MA, Jones, SA, Jonsell, S, Kurchaninov, L, Madsen, N, Mathers, M, Maxwell, D, McKenna, JTK, Menary, S, Michan, JM, Momose, T, Munich, JJ, Nolan, P, Olchanski, K, Olin, A, Pusa, P, Rasmussen, CO, Robicheaux, F, Sacramento, RL, Sameed, M, Sarid, E, Silveira, DM, Stracka, S, Stutter, G, So, C, Tharp, TD, Thompson, JE, Thompson, RI, van der Werf, DP and Wurtele, JS (2017) Antihydrogen accumulation for fundamental symmetry tests. NATURE COMMUNICATIONS, 8 (1). 681-.

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Abstract

Antihydrogen, a positron bound to an antiproton, is the simplest anti-atom. Its structure and properties are expected to mirror those of the hydrogen atom. Prospects for precision comparisons of the two, as tests of fundamental symmetries, are driving a vibrant programme of research. In this regard, a limiting factor in most experiments is the availability of large numbers of cold ground state antihydrogen atoms. Here, we describe how an improved synthesis process results in a maximum rate of 10.5 ± 0.6 atoms trapped and detected per cycle, corresponding to more than an order of magnitude improvement over previous work. Additionally, we demonstrate how detailed control of electron, positron and antiproton plasmas enables repeated formation and trapping of antihydrogen atoms, with the simultaneous retention of atoms produced in previous cycles. We report a record of 54 detected annihilation events from a single release of the trapped anti-atoms accumulated from five consecutive cycles.

Item Type:	Article
Uncontrolled Keywords:	Exotic atoms and molecules, Experimental particle physics
Depositing User:	Symplectic Admin
Date Deposited:	20 Mar 2019 12:05
Last Modified:	19 Jan 2023 00:56
DOI:	10.1038/s41467-017-00760-9
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3034566

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• Antihydrogen accumulation for fundamental symmetry tests. (deposited 09 May 2018 06:50)
  • Antihydrogen accumulation for fundamental symmetry tests. (deposited 20 Mar 2019 12:05) [Currently Displayed]