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Observation of a (6)(LambdaLambda)He double hypernucleus.
Takahashi, H; Ahn, J K; Akikawa, H; Aoki, S; Arai, K; Bahk, S Y; Baik, K M; Bassalleck, B; Chung, J H; Chung, M S; Davis, D H; Fukuda, T; Hoshino, K; Ichikawa, A; Ieiri, M; Imai, K; Iwata, Y H; Iwata, Y S; Kanda, H; Kaneko, M; Kawai, T; Kawasaki, M; Kim, C O; Kim, J Y; Kim, S J; Kim, S H; Kondo, Y; Kouketsu, T; Lee, Y L; McNabb, J W; Mitsuhara, M; Nagase, Y; Nagoshi, C; Nakazawa, K; Noumi, H; Ogawa, S; Okabe, H; Oyama, K; Park, H M; Park, I G; Parker, J; Ra, Y S; Rhee, J T; Rusek, A; Shibuya, H; Sim, K S; Saha, P K; Seki, D; Sekimoto, M; Song, J S.
Phys Rev Lett ; 87(21): 212502, 2001 Nov 19.
Article in English | MEDLINE | ID: mdl-11736336

ABSTRACT

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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