Observation of a (6)(lambdalambda)he Double Hypernucleus.

H Takahashi,J K Ahn,H Akikawa,S Aoki,K Arai,S Y Bahk,K M Baik,B Bassalleck,J H Chung,M S Chung,D H Davis,T Fukuda,K Hoshino,A Ichikawa,M Ieiri,K Imai,Y H Iwata,Y S Iwata,H Kanda,M Kaneko,T Kawai,M Kawasaki, C O Kim,J Y Kim,S J Kim,S H Kim,Y Kondo,T Kouketsu, Y L Lee,J W McNabb,M Mitsuhara,Y Nagase,C Nagoshi,K Nakazawa,H Noumi,S Ogawa,H Okabe,K Oyama,H M Park,I G Park,J Parker,Y S Ra,J T Rhee,A Rusek,H Shibuya,K S Sim,P K Saha,D Seki,M Sekimoto,J S Song,T Takahashi,F Takeutchi,H Tanaka,K Tanida, J Tojo,H Torii,S Torikai,D N Tovee,N Ushida,K Yamamoto,N Yasuda,J T Yang,C J Yoon,C S Yoon,M Yosoi,T Yoshida,L Zhu

Physical review letters（2001）

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摘要
A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ( 6)(LambdaLambda)He emitted from a Xi(-) hyperon nuclear capture at rest. The mass of ( 6)(LambdaLambda)He and the Lambda-Lambda interaction energy DeltaB(LambdaLambda) have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of DeltaB(LambdaLambda) is 1.01+/-0.20(+0.18)(-0.11) MeV. This demonstrates that the Lambda-Lambda interaction is weakly attractive.
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关键词
Superconducting Cavities,Superconducting Magnets,High Energy Density Physics,LHC Upgrade,Magnetic Resonant Coupling
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