Exotic matter with an antiproton in place of an electron
Schematic drawing of an antiprotonic helium atom.
Antimatter
Antiparticles
Positron
Antiproton
Antineutron
Antihydrogen
Antihelium
Onia
Antiprotonic hydrogen
Antiprotonic helium
Muonium
True muonium
Pionium
Positronium
Quarkonium
Concepts and phenomena
Annihilation
Baryogenesis
Baryon asymmetry
Comet
CP violation
Gravitational interaction
Positron emission
Devices
Cloud chamber
Particle accelerator
Antiproton decelerator
Relativistic Heavy Ion Collider
Penning trap
Uses
Positron emission tomography
Fuel
Weapon
People and bodies
Carl David Anderson
Paul Dirac
Andrei Sakharov
CERN
v
t
e
Antiprotonic helium is a three-body atom composed of an antiproton and an electron orbiting around a helium nucleus. It is thus made partly of matter, and partly of antimatter. The atom is electrically neutral, since both electrons and antiprotons each have a charge of −1, whereas helium nuclei have a charge of +2. It has the longest lifetime of any experimentally producible matter-antimatter bound state.[1]
^"PROGRESS REPORT OF THE ASACUSA AD-3 COLLABORATION" (PDF). Archived (PDF) from the original on 7 July 2022. Retrieved 30 July 2022.
and 28 Related for: Antiprotonic helium information
Antiprotonichelium is a three-body atom composed of an antiproton and an electron orbiting around a helium nucleus. It is thus made partly of matter...
Penning trap. It can also be inferred from the spectra of antiprotonichelium atoms (helium atoms where one of the electrons has been replaced by an antiproton)...
energy in the cancerous region. Antineutron Deuterium § Antideuterium Antiprotonichelium List of particles Recycling antimatter Positron "2018 CODATA Value:...
the AMS-01 established an upper limit of 1.1×10−6 for the antihelium to helium flux ratio. AMS-02 revealed in December 2016 that it had discovered a few...
2022. Hori, M.; et al. (2011). "Two-photon laser spectroscopy of antiprotonichelium and the antiproton-to-electron mass ratio". Nature. 475 (7357): 484–488...
Protonium (symbol: Pn)[citation needed], also known as antiprotonic hydrogen, is a type of exotic atom in which a proton (symbol: p) and an antiproton...
transition frequencies in three different atoms (hydrogen, deuterium, and antiprotonichelium). Detailed theoretical calculations in the framework of quantum electrodynamics...
the Standard Solar Model. In short: when four protons fuse to become one helium nucleus, two of them have to convert into neutrons, and each such conversion...
the AMS-01 established an upper limit of 1.1×10−6 for the antihelium to helium flux ratio. Physicists at the Lawrence Livermore National Laboratory in...
spectral measurements of long lived pionic helium. In 2022 ASACUSA reported spectral measurements of antiprotonichelium suspended in gaseous and liquid (He-I...
an experiment testing for CPT-symmetry by laser spectroscopy of antiprotonichelium and microwave spectroscopy of the hyperfine structure of antihydrogen...
Global Information
