Article
Antihydrogen production within a PenningIoffe trap.
Department of Physics, Harvard University, Cambridge, MA 02138, USA.
Physical Review Letters (Impact Factor: 7.73). 03/2008; 100(11):113001. DOI: 10.1103/PhysRevLett.100.113001 Source: PubMed

Article: Positron interactions with molecules
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ABSTRACT: In this work, we report elastic integral cross sections for low energy positron scattering by carbon monoxide and model calculations for vibrationally enhanced positron annhilation on molecules. The former studies employed the Schwinger Multichannel method in the static plus polarization approximation with two different basis sets to access numerical convergence. In the annihilation studies, the role of multimode vibrational couplings was surveyed with the help of an analytically solvable model based on the Feshbach projection operator formalism.Journal of Physics Conference Series 11/2012; 388(1):2019.  [Show abstract] [Hide abstract]
ABSTRACT: The purpose of cold antihydrogen research is briefly reviewed together with the latest developments of manipulating antihydrogen atoms. Two major progresses last year were the trapping of antihydrogen atoms in a magnetic bottle and synthesis of antihydrogen atoms in a cusp trap, where a spinpolarized antihydrogen beam can be extracted as an intensified beam. The magnetic bottle consists of an octupole coil and a pair of mirror coils, which improved the magnetic field uniformity near the axis, and so the stability of trapping antiprotons and positrons. Eventually, antihydrogen atoms were trapped for more than 1000s, which is ready to be testified with high precision laser spectroscopy. The cusp trap consists of a superconducting antiHelmholtz coil and a stack of multiple ring electrodes. This success opens a new path to make a stringent test of the CPT symmetry via high precision microwave spectroscopy of groundstate hyperfine transitions of antihydrogen atoms.Journal of Physics Conference Series 11/2012; 388(1):2002.  [Show abstract] [Hide abstract]
ABSTRACT: Precision comparisons of the properties of particles and their corresponding antiparticles are highly relevant because the Standard Model of elementary particle physics, a local, Lorentzinvariant field theory, is necessarily symmetric with respect to the combined CPT operation. This symmetry defines exact equality between the fundamental properties of particles and their antiimages. Any measured and confirmed violation constitutes a significant challenge to the Standard Model. Recent results of different CPTtests are summarized, with emphasis to the highprecision measurement of the magnetic moment of the proton and the antiproton, as well as the precision investigation of antihydrogen ground state hyperfine splitting.Annalen der Physik 07/2013; 525(7). · 1.51 Impact Factor
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