Aghion S, Ahlén O, Amsler C, Ariga A, Ariga T, Belov A S, Berggren K, Bonomi G, Bräunig P, Bremer J, Brusa R S, Cabaret L, Canali C, Caravita R, Castelli F, Cerchiari G, Cialdi S, Comparat D, Consolati G, Derking H, Di Domizio S, Di Noto L, Doser M, Dudarev A, Ereditato A, Ferragut R, Fontana A, Genova P, Giammarchi M, Gligorova A, Gninenko S N, Haider S, Huse T, Jordan E, Jørgensen L V, Kaltenbacher T, Kawada J, Kellerbauer A, Kimura M, Knecht A, Krasnický D, Lagomarsino V, Lehner S, Magnani A, Malbrunot C, Mariazzi S, Matveev V A, Moia F, Nebbia G, Nédélec P, Oberthaler M K, Pacifico N, Petràček V, Pistillo C, Prelz F, Prevedelli M, Regenfus C, Riccardi C, Røhne O, Rotondi A, Sandaker H, Scampoli P, Storey J, Vasquez M A Subieta, Špaček M, Testera G, Vaccarone R, Widmann E, Zavatarelli S, Zmeskal J
1] Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy [2] Istituto Nazionale di Fisica Nucleare, Sez. di Milano, Via Celoria 16, 20133 Milan, Italy.
Physics Department, European Organisation for Nuclear Research, 1211 Geneva 23, Switzerland.
Nat Commun. 2014 Jul 28;5:4538. doi: 10.1038/ncomms5538.
The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In the context of neutral antimatter, the gravitational interaction is of high interest, potentially revealing new forces that violate the weak equivalence principle. Here we report on a successful extension of a tool from atom optics--the moiré deflectometer--for a measurement of the acceleration of slow antiprotons. The setup consists of two identical transmission gratings and a spatially resolving emulsion detector for antiproton annihilations. Absolute referencing of the observed antimatter pattern with a photon pattern experiencing no deflection allows the direct inference of forces present. The concept is also straightforwardly applicable to antihydrogen measurements as pursued by the AEgIS collaboration. The combination of these very different techniques from high energy and atomic physics opens a very promising route to the direct detection of the gravitational acceleration of neutral antimatter.
精确测量力是深入洞察自然界中基本相互作用的一种方法。在中性反物质的背景下，引力相互作用备受关注，它可能揭示违反弱等效原理的新力。在此，我们报告了一种成功的方法，即扩展原子光学中的一种工具——莫尔偏转仪，用于测量慢速反质子的加速度。该装置由两个相同的透射光栅和一个用于反质子湮灭的空间分辨乳胶探测器组成。通过将观察到的反物质图案与无偏转的光子图案进行绝对参考，可以直接推断出存在的力。该概念也可直接应用于AEgIS合作所进行的反氢测量。将高能物理和原子物理中这些截然不同的技术相结合，为直接探测中性反物质的引力加速度开辟了一条非常有前景的途径。
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