Antimatter is fascinating not only because of its essence; It is also due to the still enigmatic role he played in the origin of the universe. Scientists still do not have the necessary tools to understand with any precision the role of this form of matter in the formation of the cosmos and the mechanisms that govern the tenuous line that delimits the imbalance between matter and antimatter. Fortunately, what they do know are its constituent elements and some of its properties.
Understand what is antimatter It’s not difficult. And we can observe it as an exotic type of matter that is made up of antiparticles, which are particles with the same mass and spin as the particles we are familiar with, but with the opposite electrical charge. In this way the antiparticle of the electron is the positron or antielectron. And the antiparticle of the proton is the antiproton.
Antimatter has a surprising property: when it comes into direct contact with matter, both annihilate, releasing a large amount of energy in the form of high-energy photons, as well as other possible particle-antiparticle pairs. It is currently being studied in many of the most important research centers specialized in particle physics in the world with the hope that knowing it better will help us understand some of the mysteries of the cosmos that remain out of our reach.
The hyperfine cleavage of antihydrogen has been revealed
CERN’s antimatter factory produces this form of matter by firing high-energy protons from an adjacent synchrotron at a metal block. This process generates a cascade of secondary particles, and among them antiprotons arise. These latter particles can then be cooled to be used in the facility’s experiments. ALPHA (Antihydrogen Laser Physics Apparatus or antihydrogen laser physics apparatus), which is one of them, is specialized in producing antihydrogen by fusing antiprotons with positrons. Researchers then use magnetic fields to trap the antihydrogen for further study.
An antihydrogen atom is composed of an antiproton in its nucleus and a positron orbiting around it, in the same way that a hydrogen atom contains a proton around which an electron orbits. Deuterium and tritium, the two isotopes of hydrogen, also have one or two neutrons in the nucleus respectively. The researchers of the ALPHA experiment have achieved something amazing: have measured hyperfine division of the ground state of the antihydrogen atom with a precision of 4 parts per million, improving the previous result by two orders of magnitude.
This milestone is very important because it allows very rigorous tests to be carried out in the field of quantum electrodynamics.
Hyperfine splitting of the ground state of the antihydrogen atom is the small splitting of the lowest energy state of the atom due to the magnetic interaction between the antiproton and the positron. According to the fundamental symmetries of nature, this measurement should be identical to the equivalent effect observed in hydrogen. Be that as it may, this milestone is very important because it allows very rigorous tests to be carried out in the field of quantum electrodynamics, which is the most precise theory that explains the interactions that occur between charged particles and light.
Jeffrey Hangst, the spokesperson for the ALPHA experiment, explains that “the hyperfine splitting of the ground state of hydrogen is the origin of the so-called 21 centimeter lineso prized by radio astronomers and researchers searching for extraterrestrial intelligence (…) When the antimatter factory was conceived in the 1990s, the hyperfine splitting of antihydrogen was one of the key measurement objectives justifying the construction of the facility.”
“The current measurement represents the culmination of many years of effort,” Hangst pointed out. “We have pursued the precise determination of the hyperfine splitting of antihydrogen since we demonstrated how to trap antimatter atoms in 2010. And now another group in the antimatter factory, the ASACUSA collaboration, is also trying to study this very important transition. Their technique, if demonstrated, has the potential to achieve even greater precision.” Thanks to ALPHA’s high level of precision, the measurement of hyperfine cleavage is sensitive to the effects of the internal structure of the antiproton at the center of the antihydrogen atom. In any case, this result is a very important step in the effort to further explore the nature of antimatter.
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