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GBAR (Gravitational Behaviour of Anti hydrogen at Rest), AD-7 experiment, is a multinational collaboration at the Antiproton Decelerator of CERN. The GBAR project aims to measure the free-fall acceleration of ultra-cold neutral anti-hydrogen atoms in the terrestrial gravitational field .
Antiprotons are stable, but they are typically short-lived, since any collision with a proton will cause both particles to be annihilated in a burst of energy. The existence of the antiproton with electric charge of −1 e, opposite to the electric charge of +1 e of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. [4]
After the Antiproton Accumulator (AA) had been operational since 1980, the update program ACOL (Antiproton COLlector) was proposed in 1983. [1] The update comprised improvement work on the antiproton source, the construction of the Antiproton Collector (AC), as well as reconstructions of the injection and ejection systems of the Antiproton Accumulator (AA) and its stochastic cooling system.
Simon van der Meer in the Antiproton Accumulator Control Room, 1984. From the beginning of the project, the potential of physics with low-energy antiprotons was recognized. A Low Energy Antiproton Ring (LEAR) was built and received antiprotons from the AA from 1983 on, for deceleration to as low as 100 MeV/c. [8] The first artificially created antimatter, in the form of anti-Hydrogen, was ...
ALPHA experiment. The Antihydrogen Laser Physics Apparatus (ALPHA), also known as AD-5, is an experiment at CERN's Antiproton Decelerator, designed to trap antihydrogen in a magnetic trap in order to study its atomic spectra.
official BASE logo. BASE (Baryon Antibaryon Symmetry Experiment), AD-8, is a multinational collaboration at the Antiproton Decelerator facility at CERN, Geneva.The goal of the Japanese and German BASE collaboration [1] are high-precision investigations of the fundamental properties of the antiproton, namely the charge-to-mass ratio and the magnetic moment.
AEgIS (Antimatter Experiment: gravity, Interferometry, Spectroscopy), AD-6, is an experiment at the Antiproton Decelerator facility at CERN.Its primary goal is to measure directly the effect of Earth's gravitational field on antihydrogen atoms with significant precision. [1]
Such experiments by the PUMA collaboration will study the evolution of neutron skins with isospin, and study the proton and neutron halos in exotic nuclei at the ISOLDE facility. [1] [3] The idea was first proposed by Wada and Yamazaki in 2001. [3] And now PUMA experiment will be the unique facility using antiprotons as probes for unstable nuclei.