@article {Baker:2021wp,
	title = {Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production},
	journal = {Nature Communications},
	volume = {12},
	number = {1},
	year = {2021},
	pages = {6139},
	abstract = {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. Here, we report on the use of laser cooled Be+ ions to sympathetically cool a large and dense plasma of positrons to directly measured temperatures below 7 K in a Penning trap for antihydrogen synthesis. This will likely herald a significant increase in the amount of antihydrogen available for experimentation, thus facilitating further improvements in studies of fundamental symmetries.},
	isbn = {2041-1723},
	doi = {10.1038/s41467-021-26086-1},
	url = {https://doi.org/10.1038/s41467-021-26086-1},
	author = {Baker, C. J. and Bertsche, W. and Capra, A. and Cesar, C. L. and Charlton, M. and Mathad, A. Cridland and Eriksson, S. and Evans, A. and Evetts, N. and Fabbri, S. and Fajans, J. and Friesen, T. and Fujiwara, M. C. and Grandemange, P. and Granum, P. and Hangst, J. S. and Hayden, M. E. and Hodgkinson, D. and Isaac, C. A. and Johnson, M. A. and Jones, J. M. and Jones, S. A. and Jonsell, S. and Kurchaninov, L. and Madsen, N. and Maxwell, D. and McKenna, J. T. K. and Menary, S. and Momose, T. and Mullan, P. and Olchanski, K. and Olin, A. and Peszka, J. and Powell, A. and Pusa, P. and Rasmussen, C. {\O}. and Robicheaux, F. and Sacramento, R. L. and Sameed, M. and Sarid, E. and Silveira, D. M. and Stutter, G. and So, C. and Tharp, T. D. and Thompson, R. I. and van der Werf, D. P. and Wurtele, J. S.}
}
