Počet záznamů: 1

Observation of the antimatter helium-4 nucleus

  1. 1.
    0365520 - UJF-V 2012 RIV GB eng J - Článek v odborném periodiku
    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
    Observation of the antimatter helium-4 nucleus.
    Nature. Roč. 473, č. 7347 (2011), s. 353-356 ISSN 0028-0836
    Grant CEP: GA MŠk LA09035
    Výzkumný záměr: CEZ:AV0Z10480505
    Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
    Impakt faktor: 36.280, rok: 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).
    Trvalý link: http://hdl.handle.net/11104/0200748