This paper gives the 2010 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use. The 2010 adjustment takes into account the data considered in the 2006 adjustment as well as the data that became available from 1 January 2007, after the closing date of that adjustment, until 31 December 2010, the closing date of the new adjustment. Further, it describes in detail the adjustment of the values of the constants, including the selection of the final set of input data based on the results of least-squares analyses. The 2010 set replaces the previously recommended 2006 CODATA set and may also be found on the World Wide Web at physics.nist.gov/constants.

/pdf/codata-recommended-values-of-the-fundamental-physical-4bsdant71c.pdf

CODATA Recommended Values of the Fundamental Physical Constants: 2006

The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A mileston...

/pdf/the-asacusa-antihydrogen-and-hydrogen-program-results-and-4qelcq5aco.pdf

The ASACUSA antihydrogen and hydrogen program : results and prospects

A measurement of the hyperfine structure of antihydrogen promises one of the best tests of CPT symmetry. We describe an experiment planned at the Antiproton Decelerator of CERN to measure this quantity in a beam of slow antihydrogen atoms.

/pdf/measurement-of-the-hyperfine-structure-of-antihydrogen-in-a-3oua7kr94b.pdf

Measurement of the hyperfine structure of antihydrogen in a beam

The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through the detection of 80 antihydrogen atoms 2.7 meters away from their production region. This was the first observation of "cold" antihydrogen atoms in a magnetic field free region. In parallel to the progress on the antihydrogen production, the spectroscopy beamline was tested with a source of hydrogen. This led to a measurement at a relative precision of 2.7x 10^(-9) which constitues the most precise measurement of the hydrogen hyperfine splitting in a beam. Further measurements with an upgraded hydrogen apparatus are motivated by CPT and Lorentz violation tests in the framework of the Standard Model Extension. Unlike for hydrogen, the antihydrogen experiment is complicated by the difficulty of synthesizing enough cold antiatoms in ground-state. The first antihydrogen quantum states scan at the entrance of the spectroscopy apparatus was realized in 2016 and is presented here. The prospects for a ppm measurement are also discussed.

Azuma, T.1, Bakos, J. S. 2, Bluhme, H. 3, Charlton, M. 4, Dörner, R. 5, Eades, J. 6, Fujiwara, M.C. 7, Funakoshi, R. 7, Hayano, R.S. 7, Higaki, H.8, Hoekstra, R. 9, Hori, M.7, Horváth, D.2, Hyodo, T.8, Ichioka, T.8, Ishikawa, T. 7, Iwasaki, M.10, Juhász, B. 11, Kambara, T. 12, Ketzer, B. 6, Knudsen, H. 3, Kojima, T.12, Komaki, K.8, Kuga, T.8, Kumakura, M. 13, Kuroda, N. 8, Kuroki, K.8, McCullough, R.W. 14, Merrison, J. 3, Mikkelsen, U. 3, Møller, S. P. 15, Mohri, A.12, Morita, N.13, Nakai, Y.12, Oshima, N. 12, Rothard, H, 16, Sakaguchi, J. 7, Scheidenberger, C. 17, Schmidt-Böcking, H.5, Slevin, J. 18, Suzuki, K.7, Tanuma, H. 19, Thompson, W.R. 3, Torii, H. A.8, Uggerhøj, E. 15, Ujvári, B.11, Ullrich, J.20, Wada, M. 12, Widmann, E. 7, Yamaguchi, H. 7, Yamazaki, T. 21, Yamazaki, Y. 8,12, Yoshiki Franzén, K.8

/pdf/atomic-spectroscopy-and-collisions-using-slow-antiprotons-19ghgmkl6g.pdf

Atomic spectroscopy and collisions using slow antiprotons

Atomic Hydrogen Hyperfine Structure Experiments

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Atomic Hydrogen Hyperfine Structure Experiments