Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.212502
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A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of He-6(Lambda Lambda) emitted from a Xi (-) hyperon nuclear capture at rest. ne mass of He-6(Lambda Lambda) and the Lambda-Lambda interaction energy DeltaB(Lambda Lambda) have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of DeltaB(Lambda Lambda) is 1-01 0.20(-0.11)(+0.18) mev. This demonstrates that the Lambda-Lambda interaction is weakly attractive.
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