Počet záznamů: 1
Observation of an Antimatter Hypernucleus
- 1.0343354 - ÚJF 2011 RIV US eng J - Článek v odborném periodiku
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Observation of an Antimatter Hypernucleus.
Science. Roč. 328, č. 5974 (2010), s. 58-62. ISSN 0036-8075. E-ISSN 1095-9203
Grant CEP: GA ČR GA202/07/0079; GA MŠMT LA09013
Výzkumný záměr: CEZ:AV0Z10480505; CEZ:AV0Z10100502
Klíčová slova: QUARK-GLUON-PLASMA * LIGHT HYPERNUCLEI * STRANGENESS
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 31.377, rok: 2010
Nuclear collisions recreate conditions in the universe microseconds after the Big Bang. Only a very small fraction of the emitted fragments are light nuclei, but these states are of fundamental interest. We report the observation of antihypertritons-comprising an antiproton, an antineutron, and an antilambda hyperon-produced by colliding gold nuclei at high energy. Our analysis yields 70 +/- 17 antihypertritons (3/Lambda(H) over bar) and 157 +/- 30 hypertritons (H-3(Lambda)). The measured yields of H-3(Lambda) (3/Lambda(H) over bar) and He-3 ((3)(He) over bar) are similar, suggesting an equilibrium in coordinate and momentum space populations of up, down, and strange quarks and antiquarks, unlike the pattern observed at lower collision energies. The production and properties of antinuclei, and of nuclei containing strange quarks, have implications spanning nuclear and particle physics, astrophysics, and cosmology.
Trvalý link: http://hdl.handle.net/11104/0185854
Počet záznamů: 1