Definitions for pionium
pi·o·ni·um

WiktionaryRate this definition:0.0 / 0 votes

1. pioniumnoun

   an exotic atom equivalent to a hydrogen atom with the proton replaced by a pion

2. pioniumnoun

   an onium where the bound antiparticle-particle pair is a pion and an antipion.

WikipediaRate this definition:0.0 / 0 votes

1. Pionium

   Pionium is a composite particle consisting of one π+ and one π− meson. It can be created, for instance, by interaction of a proton beam accelerated by a particle accelerator and a target nucleus. Pionium has a short lifetime, predicted by chiral perturbation theory to be 2.89×10−15 s. It decays mainly into two π0 mesons, and to a smaller extent into two photons. It has been investigated at CERN to measure its lifetime. The Dimeson Relativistic Atomic Complex (DIRAC) experiment at the Proton Synchrotron was able to detect 21227 atomic pairs from a total of 1.5×109 events, which allows the pionium lifetime to be determined to within statistical errors of 9%.In 2006, the NA48/2 collaboration at CERN published an evidence for pionium production and decay in decays of charged kaons, studying mass spectra of daughter pion pairs in the events with three pions in the final state K± → π±(ππ)atom → π±π0π0. This was followed by a precision measurement of the S-wave pion scattering length, published by the collaboration in 2009.The results of the above experiments will provide crucial tests of low-energy QCD predictions.

WikidataRate this definition:0.0 / 0 votes

1. Pionium

   Pionium is an exotic atom consisting of one π+ and one π− meson. It can be created, for instance, by interaction of a proton beam accelerated by a particle accelerator and a target nucleus. Pionium has a short lifetime, predicted by chiral perturbation theory to be 2.89×10^−15 s. It decays mainly into two π0 mesons, and to a smaller extent into two photons. Pionium is currently under investigation at CERN to measure its lifetime. The DIRAC collaboration was able to detect more than 5000 pionium decays from a total of 6.4×10^8 events, which will allow the lifetime to be determined to within statistical errors of 15%. The team hopes to reduce this error to 10% in the future. In 2005, the NA48/2 collaboration at CERN published an evidence for pionium production and decay in decays of charged kaons, studying mass spectra of daughter pion pairs in the events with three pions in the final state: . The possibility to measure pionium characteristics is being investigated. The results of the above experiments will provide crucial tests of low-energy QCD predictions.

How to pronounce pionium?

1. Alex

   US English

   David

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   Mark

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   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

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   Indian

   Priya

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   Neerja

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   Oliver

   British

   Wendy

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   South African

How to say pionium in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of pionium in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of pionium in Pythagorean Numerology is: 7

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Pionium
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Pionium
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=pionium