CERN Accelerating science

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1.
Measurements and 3D reconstruction of antimatter annihilations with the ASACUSA Micromegas Tracker / Radics, B (RIKEN (main) ; Zurich, ETH) ; Breuker, H (CERN) ; Dupre, P (RIKEN (main)) ; Higashi, Y (U. Tokyo (main)) ; Kaga, C (ADSM, Hiroshima) ; Leali, M (INFN, Brescia ; Brescia U.) ; Lodi Rizzini, E (INFN, Brescia ; Brescia U.) ; Mascagna, V (INFN, Brescia ; Brescia U.) ; Matsudate, T (U. Tokyo (main)) ; Murtagh, D J (RIKEN (main)) et al.
The aim of the ASACUSA-CUSP experiment is to form a beam of antihydrogen atoms for in-flight precision spectroscopic measurements. This is performed by trapping and mixing antiprotons and positrons in a common nested-well potential, which is sitting in a double-cusp magnetic field with minimum-B field configuration. [...]
2017 - 6 p. - Published in : JPS Conf. Proc. 18 (2017) 011010 Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011010
2.
First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer / Finlay, P (Leuven U.) ; Breitenfeldt, M (Leuven U.) ; Porobić, T (Leuven U.) ; Wursten, E (Leuven U.) ; Ban, G (Caen U.) ; Beck, M (Munster U.) ; Couratin, C (Leuven U.) ; Fabian, X (Caen U.) ; Fléchard, X (Caen U.) ; Friedag, P (Munster U.) et al.
The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the $ \beta^+$ decay of$^{35}$Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2ns and position resolution of 0.1mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. [...]
2016 - Published in : Eur. Phys. J. A 52 (2016) 206 Fulltext: PDF;
3.
The development of the antihydrogen beam detector and the detection of the antihydrogen atoms for in-flight hyperfine spectroscopy / Nagata, Y (Wako, RIKEN) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A (Stefan Meyer Inst. Subatomare Phys.) ; Kuroda, N (Tokyo, U. Earth Sci. Astron.) ; Abo, Y ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Dupre, P (Wako, RIKEN) ; Higashi, Y (Tokyo, U. Earth Sci. Astron.) ; Ishikawa, S (Tokyo, U. Earth Sci. Astron.) ; Kaga, C (ADSM, Hiroshima) et al.
We have been developing ground-state antihydrogen atomic beams to test CPT symmetry via in-flight hyperfine spectroscopy. A new antihydrogen beam detector has been developed. [...]
2015 - 1 p. - Published in : J. Phys.: Conf. Ser. 635 (2015) 022061 IOP Open Access article: PDF;
In : 29th International Conference on Photonic, Electronic, and Atomic Collisions, Toledo, Spain, 22 - 28 July 2015, pp.022061
4.
Space-charge effects in Penning ion traps / Porobić, T (KU Leuven, Dept. Phys. Astron.) ; Beck, M (Munster U.) ; Breitenfeldt, M (KU Leuven, Dept. Phys. Astron.) ; Couratin, C (Caen U.) ; Finlay, P (KU Leuven, Dept. Phys. Astron.) ; Knecht, A (KU Leuven, Dept. Phys. Astron. ; CERN) ; Fabian, X (Caen U.) ; Friedag, P (Munster U.) ; Fléchard, X (Caen U.) ; Liénard, E (Caen U.) et al.
The influence of space-charge on ion cyclotron resonances and magnetron eigenfrequency in a gas-filled Penning ion trap has been investigated. Off-line measurements with View the MathML source using the cooling trap of the WITCH retardation spectrometer-based setup at ISOLDE/CERN were performed. [...]
2015 - 10 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 785 (2015) 153-162 Elsevier Open Access article: PDF;
5.
Towards Measuring the Ground State Hyperfine Splitting of Antihydrogen -- A Progress Report / Sauerzopf, C. (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A.A. (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M. (Stefan Meyer Inst. Subatomare Phys.) ; Dupré, P. (Wako, RIKEN) ; Higashi, Y. (Tokyo U., Komaba) ; Kaga, C. (ADSM, Hiroshima) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M. (Brescia U. ; INFN, Pavia) ; Lehner, S. (Stefan Meyer Inst. Subatomare Phys.) ; Lodi Rizzini, E. (Brescia U. ; INFN, Pavia) et al.
We report the successful commissioning and testing of a dedicated field-ioniser chamber for measuring principal quantum number distributions in antihydrogen as part of the ASACUSA hyperfine spectroscopy apparatus. The new chamber is combined with a beam normalisation detector that consists of plastic scintillators and a retractable passivated implanted planar silicon (PIPS) detector..
arXiv:1606.01791.- 2016-06-20 - 5 p. - Published in : Hyperfine Interact. 237 (2016) 103 Fulltext: PDF; External link: Preprint
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.103
6.
BASE – The Baryon Antibaryon Symmetry Experiment / BASE Collaboration
The Baryon Antibaryon Symmetry Experiment (BASE) aims at performing a stringent test of the combined charge parity and time reversal (CPT) symmetry by comparing the magnetic moments of the proton and the antiproton with high precision. Using single particles in a Penning trap, the proton/antiproton $g$-factors, i.e. [...]
arXiv:1604.08820.- 2015-11-23 - 54 p. - Published in : Eur. Phys. J. Spec. Top. Fulltext: arXiv:1604.08820 - PDF; 1604.08820 - PDF; External link: Springer server - Please contact the library if you need to access this document.
7.
High-precision comparison of the antiproton-to-proton charge-to-mass ratio / BASE Collaboration
Invariance under the charge, parity, time-reversal (CPT) transformation$^{1}$ is one of the fundamental symmetries of the standard model of particle physics. This CPT invariance implies that the fundamental properties of antiparticles and their matter-conjugates are identical, apart from signs. [...]
2015 - 4 p. - Published in : Nature 524 (2015) 196-199 NPG Open Access article: PDF; External links: Supplementary information; Nature News; INTERACTIONS
8.
A reservoir trap for antiprotons / BASE Collaboration
We have developed techniques to extract arbitrary fractions of antiprotons from an accumulated reservoir, and to inject them into a Penning-trap system for high-precision measurements. In our trap-system antiproton storage times > 1.08 years are estimated. [...]
arXiv:1507.04147.- 2015-08-17 - 4 p. - Published in : Int. J. Mass Spectrometry 389 (2015) 10–13 Fulltext: PDF; External link: Preprint
9.
Annual Report 2014 - BASE Collaboration / BASE Collaboration
BASE aims at direct high-precision measurements of the magnetic moments of the proton and the antiproton. [...]
CERN-SPSC-2015-003 ; SPSC-SR-152.
- 2015.
Fulltext
10.
The magnetic moments of the proton and the antiproton / BASE Collaboration
Recent exciting progress in the preparation and manipulation of the motional quantum states of a single trapped proton enabled the first direct detection of the particle's spin state. Based on this success the proton magnetic moment $\mu_p$ was measured with ppm precision in a Penning trap with a superimposed magnetic field inhomogeneity. [...]
arXiv:1402.1806.- 2014-04-10 - 7 p. - Published in : J. Phys.: Conf. Ser. 488 (2014) 012033 Fulltext: jpconf14_488_012033 - PDF; arXiv:1402.1806 - PDF;

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