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Observation of the antimatter helium-4 nucleus
- 1.0365520 - ÚJF 2012 RIV GB eng J - Journal Article
Agakishiev, C. - Aggarwal, M. M. - Ahammed, Z. - Bielčík, J. - Bielčíková, Jana - Chaloupka, Petr - Chung, P. - Kapitán, Jan - Kouchpil, V. - Rusnak, J. - Šumbera, Michal - Tlustý, David … Total 400 authors
Observation of the antimatter helium-4 nucleus.
Nature. Roč. 473, č. 7347 (2011), s. 353-356. ISSN 0028-0836. E-ISSN 1476-4687
R&D Projects: GA MŠMT LA09035
Institutional research plan: CEZ:AV0Z10480505
Keywords : QUARK-GLUON PLASMA * ANTIPROTONS * COLLISIONS * ELECTRON
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 36.280, year: 2011
High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang(1); in both cases, matter and antimatter are formed with comparable abundance. However, the relatively short-lived expansion in nuclear collisions allows antimatter to decouple quickly from matter, and avoid annihilation. Thus, a high-energy accelerator of heavy nuclei provides an efficient means of producing and studying antimatter. The antimatter helium-4 nucleus ((4)(He) over bar), also known as the anti-alpha ((alpha) over bar), consists of two antiprotons and two antineutrons (baryon number B = -4). It has not been observed previously, although the alpha-particle was identified a century ago by Rutherford and is present in cosmic radiation at the ten per cent level(2).
Permanent Link: http://hdl.handle.net/11104/0200748
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