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Title: Measuring antimatter gravity with muonium

The gravitational acceleration of antimatter, ¯g, has never been directly measured and could bear importantly on our understanding of gravity, the possible existence of a fifth force, and the nature and early history of the universe. Only two avenues for such a measurement appear to be feasible: antihydrogen and muonium. The muonium measurement requires a novel, monoenergetic, low-velocity, horizontal muonium beam directed at an atom interferometer. The precision three-grating interferometer can be produced in silicon nitride or ultrananocrystalline diamond using state-of-the-art nanofabrication. The required precision alignment and calibration at the picometer level also appear to be feasible. With 100 nm grating pitch, a 10% measurement of ¯g can be made using some months of surface-muon beam time, and a 1% or better measurement with a correspondingly larger exposure. This could constitute the first gravitational measurement of leptonic matter, of 2nd-generation matter and, possibly, the first measurement of the gravitational acceleration of antimatter.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [1] ; ; ;
  1. Illinois Inst. of Technology, Chicago, IL (United States)
  2. Paul Scherrer Inst., Villigen (Switzerland); ETH, Zurich (Switzerland)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Harvard Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Publication Date:
OSTI Identifier:
1209117
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 95; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Research Org:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS