Effects of collisions on antiprotonic atoms

Research output: Contribution to journalArticle

Abstract

A brief review is given of three experiments at the Antiproton Decelerator at CERN to test CPT invariance which states that particles and antiparticles have identical properties, in particular the same mass and opposite charge. Two experiments, ATHENA and ATRAP aim to study atomic transitions at high precision on antihydrogen, the antiproton-positron atom, as compared to ordinary hydrogen. The third experiment, ASACUSA, performs spectroscopy of antiprotonic helium to measure the charge and mass of the antiproton, at present with the precision of 10 ppb. Collisions play an important role in these studies. The capture of the antiproton in bound state happens in collisions. Collisions (especially those with foreign atoms) can destroy the freshly formed system, and collisions with the medium or residual gas changes its lifetime and energy levels.

Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume233
Issue number1-4
DOIs
Publication statusPublished - May 2005

Fingerprint

antiprotons
Atoms
collisions
atoms
Helium
Experiments
Positrons
brakes (for arresting motion)
Invariance
antiparticles
Electron energy levels
residual gas
Hydrogen
Gases
Spectroscopy
invariance
positrons
energy levels
helium
life (durability)

Keywords

  • Antihydrogen
  • Antiprotonic helium
  • Cascade decay
  • CPT invariance
  • Exotic atom
  • Ion trap
  • Laser spectroscopy

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

Cite this

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abstract = "A brief review is given of three experiments at the Antiproton Decelerator at CERN to test CPT invariance which states that particles and antiparticles have identical properties, in particular the same mass and opposite charge. Two experiments, ATHENA and ATRAP aim to study atomic transitions at high precision on antihydrogen, the antiproton-positron atom, as compared to ordinary hydrogen. The third experiment, ASACUSA, performs spectroscopy of antiprotonic helium to measure the charge and mass of the antiproton, at present with the precision of 10 ppb. Collisions play an important role in these studies. The capture of the antiproton in bound state happens in collisions. Collisions (especially those with foreign atoms) can destroy the freshly formed system, and collisions with the medium or residual gas changes its lifetime and energy levels.",
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KW - Antihydrogen

KW - Antiprotonic helium

KW - Cascade decay

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KW - Exotic atom

KW - Ion trap

KW - Laser spectroscopy

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