Directory / Experiments
Experiments
The collaborations that make, trap, cool, weigh and measure antimatter, and the detectors that look for it in the sky.
Active12
- Antihydrogen Laser Physics ApparatusTrap antihydrogen and compare its spectrum and its response to gravity with those of hydrogen, testing CPT symmetry and the weak equivalence principle.
- Antihydrogen Experiment: Gravity, Interferometry, SpectroscopyMeasure Earth's gravitational acceleration on a pulsed, horizontally travelling beam of antihydrogen with a moiré deflectometer, aiming for 1% precision.
- Gravitational Behaviour of Antihydrogen at RestTime the free fall of ultracold antihydrogen, obtained by cooling and photodetaching positive antihydrogen ions, to test the weak equivalence principle.
- Atomic Spectroscopy And Collisions Using Slow AntiprotonsTest CPT symmetry by laser spectroscopy of antiprotonic helium and in-flight hyperfine spectroscopy of an antihydrogen beam, and study antiproton collisions with atoms.
- Baryon Antibaryon Symmetry ExperimentCompare the magnetic moments and charge-to-mass ratios of protons and antiprotons in cryogenic Penning traps to test CPT invariance in the baryon sector.
- BASE-STEP transportable antiproton trapMove trapped antiprotons by road from CERN's Antimatter Factory to low-noise laboratories, where CPT tests at least 100 times more precise should be possible.
- Alpha Magnetic SpectrometerMeasure charged cosmic rays above the atmosphere with particle-physics precision to search for antimatter and dark-matter signatures and to trace the origin of cosmic rays.
- A Large Ion Collider ExperimentStudy strongly interacting matter at extreme energy densities in LHC collisions, including measuring how light antinuclei and antihypernuclei form, interact and compare with their matter partners.
- Large Hadron Collider beauty experimentMeasure the small differences between matter and antimatter, chiefly CP violation in decays of hadrons containing beauty and charm quarks.
- Tokai to KamiokaCompare neutrino and antineutrino oscillations to determine whether leptons violate CP symmetry, a possible source of the universe's matter–antimatter imbalance.
- General Antiparticle SpectrometerSearch for low-energy cosmic-ray antideuterons and antihelium, and measure low-energy antiprotons, as signatures of dark matter.
- Chirp laser cooling of positronium, University of Tokyo with KEK and AISTLaser-cool positronium, the bound state of an electron and a positron, as a step toward precision tests of bound-state QED and Bose–Einstein condensation of a matter–antimatter system.
Under construction1
Completed9
- Antihydrogen TrapProduce, trap and study cold antihydrogen for precise comparison with hydrogen.
- Precision Comparison of Antiproton and Proton Masses in a Penning TrapCapture antiprotons in a Penning trap and compare the antiproton's charge-to-mass ratio with the proton's.
- Antihydrogen Production and Precision ExperimentsProduce cold antihydrogen by mixing trapped antiprotons and positrons, as a first step toward precision comparison with hydrogen.
- Antihydrogen Production in p̄–Z InteractionsProduce antihydrogen atoms in flight by passing antiprotons circulating in LEAR through a xenon gas-jet target.
- Antiproton Cell ExperimentMeasure how effectively antiproton beams kill cells relative to protons, to assess antiprotons for cancer radiotherapy.
- Payload for Antimatter Matter Exploration and Light-nuclei AstrophysicsMeasure cosmic-ray antiprotons and positrons from orbit over a wide energy range and search for antinuclei, to probe dark matter and cosmic-ray propagation.
- Solenoidal Tracker at RHICStudy quark-gluon plasma in heavy-ion collisions, including discovering and characterising the antinuclei these collisions produce.
- Fermilab E862 – Observation of Antihydrogen AtomsProduce and detect fast antihydrogen atoms formed when circulating antiprotons capture positrons created in collisions with a hydrogen gas-jet target.
- Balloon-borne Experiment with a Superconducting SpectrometerSearch cosmic rays for antihelium and measure low-energy antiprotons with a balloon-borne superconducting magnetic spectrometer.