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Title: Observation of an Antimatter Hypernucleus

Abstract

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 - composed of an antiproton, antineutron, and antilambda hyperon - produced by colliding gold nuclei at high energy. Our analysis yields 70 {+-} 17 antihypertritons ({sub {bar {Lambda}}}{sup 3}{bar H}) and 157 {+-} 30 hypertritons ({sub {Lambda}}{sup 3}H). The measured yields of {sub {Lambda}}{sup 3}H ({sub {bar {Lambda}}}{sup 3}{bar H}) and {sup 3}He ({sup 3}{ovr He}) 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 nuclei containing strange quarks, have implications spanning nuclear/particle physics, astrophysics, and cosmology.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Nuclear Science Division
OSTI Identifier:
986223
Report Number(s):
LBNL-3798E
Journal ID: ISSN 0193-4511; SCEHDK; TRN: US1006599
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science; Journal ID: ISSN 0193-4511
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANTIMATTER; ANTINUCLEI; ASTROPHYSICS; COSMOLOGY; GOLD; HYPERONS; LIGHT NUCLEI; NUCLEI; PHYSICS; PRODUCTION; QUARKS; UNIVERSE; 58

Citation Formats

STAR Collaboration, and Abelev, Betty. Observation of an Antimatter Hypernucleus. United States: N. p., 2010. Web. doi:10.1126/science.1183980.
STAR Collaboration, & Abelev, Betty. Observation of an Antimatter Hypernucleus. United States. https://doi.org/10.1126/science.1183980
STAR Collaboration, and Abelev, Betty. 2010. "Observation of an Antimatter Hypernucleus". United States. https://doi.org/10.1126/science.1183980. https://www.osti.gov/servlets/purl/986223.
@article{osti_986223,
title = {Observation of an Antimatter Hypernucleus},
author = {STAR Collaboration and Abelev, Betty},
abstractNote = {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 - composed of an antiproton, antineutron, and antilambda hyperon - produced by colliding gold nuclei at high energy. Our analysis yields 70 {+-} 17 antihypertritons ({sub {bar {Lambda}}}{sup 3}{bar H}) and 157 {+-} 30 hypertritons ({sub {Lambda}}{sup 3}H). The measured yields of {sub {Lambda}}{sup 3}H ({sub {bar {Lambda}}}{sup 3}{bar H}) and {sup 3}He ({sup 3}{ovr He}) 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 nuclei containing strange quarks, have implications spanning nuclear/particle physics, astrophysics, and cosmology.},
doi = {10.1126/science.1183980},
url = {https://www.osti.gov/biblio/986223}, journal = {Science},
issn = {0193-4511},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {7}
}