The international collaboration Athena, that involves Genoa, Pavia and Brescia Infn researchers, has yet been able to induce for the first time a chemical reaction between matter and antimatter that produced protonium: it is formed of one hydrogen ion and one anti-hydrogen ion, that is to say a proton and an antiproton. The result has been published today Friday, October 13, by Physical Review Letters.
The Athena experiment, an “antimatter factory” is fitted out at Cern, in Geneva and it produced for the first time in 2002 an antimatter “cloud”, formed of some thousands of anti-hydrogen atoms. The result was published by Nature review. Nevertheless, researchers pointed out a strange structure that appeared in the distribution of annihilation positions of the antimatter. “Athena stopped taking data at the end of 2004, but the analysis of the data gathered up that moment went on and the research published today is one of the result of this activity. It explains exactly that, at that time, “mysterious” structure, says Evandro Lodi Rizzini, who coordinated this analysis and who belongs to Infn associated group of Brescia.
Atoms of anti-hydrogen in Athena were created making come in contact anti-protons and anti-electrons in a high vacuum environment. In these conditions about 10.000-100.000 hydrogen molecules per a cube centimetre remain, versus the many thousands milliard and milliard molecules that would be present in a no vacuum environment. “Probably, exactly these remaining molecules are responsible for the observed phenomenon. We believe in fact that the anti-electrons, which were put in the vacuum room, caused the ionization of some hydrogen molecules, by removing an electron from them. These ionized molecules (H2+) have been then attracted by the antiprotons, which can be considered in this case anti-hydrogen ions. The chemical reaction that produced the protonium derived exactly from this process” goes on Evandro Lodi Rizzini.
Production of protonium was in the past already observed, but in different conditions. This is the first time that this simple and symmetric structure of matter and anti-matter - that looks like a hydrogen atom and an anti-hydrogen one - is produced through a chemical reaction. This result opens a course for the realization of high-efficiency protonium sources. We will be able to study in details fundamental characteristics of this structure, in particular the energy levels, in order to compare them with the theoretical models.
Scientists uncover the role of a protein in production & survival of myelin-forming cells
19.07.2018 | Advanced Science Research Center, GC/CUNY
NYSCF researchers develop novel bioengineering technique for personalized bone grafts
18.07.2018 | New York Stem Cell Foundation
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences