Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Nature. 2011 May 19;473(7347):353-6. doi: 10.1038/nature10079. Epub 2011 Apr 24.

Observation of the antimatter helium-4 nucleus.

Collaborators (374)

Agakishiev H, Aggarwal MM, Ahammed Z, Alakhverdyants AV, Alekseev I, Alford J, Anderson BD, Anson CD, Arkhipkin D, Averichev GS, Balewski J, Beavis D, Behera N, Bellwied R, Betancourt M, Betts R, Bhasin A, Bhati A, Bichsel H, Bielcik J, Bielcikova J, Biritz B, Bland L, Bordyuzhin I, Borowski W, Bouchet J, Braidot E, Brandin A, Bridgeman A, Brovko S, Bruna E, Bueltmann S, Bunzarov I, Burton T, Cai X, Caines H, Calderon M, Cebra D, Cendejas R, Cervantes M, Chajecki Z, Chaloupka P, Chattopadhyay S, Chen H, Chen J, Chen J, Chen L, Cheng J, Cherney M, Chikanian A, Choi K, Christie W, Chung P, Codrington M, Corliss R, Cramer J, Crawford H, Davila Leyva A, De Silva L, Debbe R, Dedovich T, Derevschikov A, Derradi de Souza R, Didenko L, Djawotho P, Dogra S, Dong X, Drachenberg J, Draper J, Dunlop J, Efimov L, Elnimr M, Engelage J, Eppley G, Estienne M, Eun L, Evdokimov O, Fatemi R, Fedorisin J, Fersch R, Filip P, Finch E, Fine V, Fisyak Y, Gagliardi C, Gangadharan D, Geurts F, Ghosh P, Gorbunov Y, Gordon A, Grebenyuk O, Grosnick D, Guertin S, Gupta A, Gupta S, Guryn W, Haag B, Hajkova O, Hamed A, Han LX, Harris J, Hays-Wehle J, Heinz M, Heppelmann S, Hirsch A, Hjort E, Hoffmann G, Hofman D, Huang B, Huang H, Humanic T, Huo L, Igo G, Jacobs P, Jacobs W, Jena C, Jin F, Joseph J, Judd E, Kabana S, Kang K, Kapitan J, Kauder K, Ke H, Keane D, Kechechyan A, Kettler D, Kikola D, Kiryluk J, Kisiel A, Kizka V, Klein S, Knospe A, Koetke D, Kollegger T, Konzer J, Koralt I, Koroleva L, Korsch W, Kotchenda L, Kouchpil V, Kravtsov P, Krueger K, Krus M, Kumar L, Kurnadi P, Lamont M, Landgraf J, LaPointe S, Lauret J, Lebedev A, Lednicky R, Lee J, Leight W, LeVine M, Li C, Li L, Li N, Li W, Li X, Li X, Li Y, Li Z, Lisa M, Liu F, Liu H, Liu J, Ljubicic T, Llope W, Longacre R, Love W, Lu Y, Lukashov E, Luo X, Ma G, Ma Y, Mahapatra D, Majka R, Mall O, Manweiler R, Margetis S, Markert C, Masui H, Matis H, Matulenko YA, McDonald D, McShane T, Meschanin A, Milner R, Minaev N, Mioduszewski S, Mitrovski M, Mohammed Y, Mohanty B, Mondal M, Morozov B, Morozov D, Munhoz M, Mustafa M, Naglis M, Nandi B, Nayak T, Netrakanti P, Nogach L, Nurushev S, Odyniec G, Ogawa A, Oh K, Ohlson A, Okorokov V, Oldag E, Olson D, Pachr M, Page B, Pal S, Pandit Y, Panebratsev Y, Pawlak T, Pei H, Peitzmann T, Perkins C, Peryt W, Pile P, Planinic M, Ploskon M, Pluta J, Plyku D, Poljak N, Porter J, Poskanzer A, Potukuchi B, Powell C, Prindle D, Pruneau C, Pruthi N, Pujahari P, Putschke J, Qiu H, Raniwala R, Raniwala S, Ray R, Redwine R, Reed R, Ritter H, Roberts J, Rogachevskiy O, Romero J, Ruan L, Rusnak J, Sahoo N, Sakrejda I, Salur S, Sandweiss J, Sangaline E, Sarkar A, Schambach J, Scharenberg R, Schmah A, Schmitz N, Schuster T, Seele J, Seger J, Selyuzhenkov I, Seyboth P, Shah N, Shahaliev E, Shao M, Sharma M, Shi S, Shou Q, Sichtermann E, Simon F, Singaraju R, Skoby M, Smirnov N, Solanki D, Sorensen P, Spinka H, Srivastava B, Stanislaus T, Staszak D, Steadman S, Stevens J, Stock R, Strikhanov M, Stringfellow B, Suaide A, Suarez M, Subba N, Sumbera M, Sun X, Sun Y, Sun Z, Surrow B, Svirida D, Symons T, Szanto de Toledo A, Takahashi J, Tang A, Tang Z, Tarini L, Tarnowsky T, Thein D, Thomas J, Tian J, Timmins A, Tlusty D, Tokarev M, Trainor T, Trentalange S, Tribble R, Tribedy P, Tsai O, Ullrich T, Underwood D, Van Buren G, van Nieuwenhuizen G, Vanfossen J Jr, Varma R, Vasconcelos G, Vasiliev A, Videbaek F, Viyogi Y, Vokal S, Voloshin S, Wada M, Walker M, Wang F, Wang G, Wang H, Wang J, Wang Q, Wang X, Wang Y, Webb G, Webb J, Westfall G, Whitten C Jr, Wieman H, Wissink S, Witt R, Witzke W, Wu Y, Xiao Z, Xie W, Xu H, Xu N, Xu Q, Xu W, Xu Y, Xu Z, Xue L, Yang Y, Yang Y, Yepes P, Yip K, Yoo IK, Zawisza M, Zbroszczyk H, Zhan W, Zhang J, Zhang S, Zhang W, Zhang X, Zhang Y, Zhang Z, Zhao F, Zhao J, Zhong C, Zhou W, Zhu X, Zhu Y, Zoulkarneev R, Zoulkarneeva Y.

Erratum in

  • Nature. 2011 Jul 21;475(7356):412.

Abstract

High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang; 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 (4He), also known as the anti-α (α), consists of two antiprotons and two antineutrons (baryon number B = -4). It has not been observed previously, although the α-particle was identified a century ago by Rutherford and is present in cosmic radiation at the ten per cent level. Antimatter nuclei with B < -1 have been observed only as rare products of interactions at particle accelerators, where the rate of antinucleus production in high-energy collisions decreases by a factor of about 1,000 with each additional antinucleon. Here we report the observation of 4He, the heaviest observed antinucleus to date. In total, 18 4He counts were detected at the STAR experiment at the Relativistic Heavy Ion Collider (RHIC; ref. 6) in 10(9) recorded gold-on-gold (Au+Au) collisions at centre-of-mass energies of 200 GeV and 62 GeV per nucleon-nucleon pair. The yield is consistent with expectations from thermodynamic and coalescent nucleosynthesis models, providing an indication of the production rate of even heavier antimatter nuclei and a benchmark for possible future observations of 4He in cosmic radiation.

PMID:
21516103
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Nature Publishing Group
    Loading ...
    Write to the Help Desk