Observation of a (6)(LambdaLambda)He double hypernucleus

Authors :: 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
Source :: Physical review letters. 87(21)
Publication Year :: 2001
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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