page_title: Antiprotonic helium
hierarchical_section_title: Antiprotonic helium
caption_attribution_description: English: A schematic drawing of antiprotonic helium.
context_page_description: 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.
context_section_description: 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.
caption: Schematic drawing of an antiprotonic helium atom.
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