Antihydrogen accumulation for fundamental symmetry tests.

Antihydrogen accumulation for fundamental symmetry tests.
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DOI:
10.1038/s41467-017-00760-9
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发表时间:
2017-09-25
影响因子:
16.6
通讯作者:
Wurtele JS
Wurtele JS
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ahmadi M;Alves BXR;Baker CJ;Bertsche W;Butler E;Capra A;Carruth C;Cesar CL;Charlton M;Cohen S;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 CØ;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;Wurtele JS

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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. Antihydrogen studies are important in testing the fundamental principles of physics but producing antihydrogen in large amounts is challenging. Here the authors demonstrate an efficient and high-precision method for trapping and stacking antihydrogen by using controlled plasma.
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