Author/Authors :
A. Ichikawa، نويسنده , , J.K. Ahn، نويسنده , , H. Akikawa، نويسنده , , S. Aoki، نويسنده , , K. Arai، نويسنده , , S.Y. Bahk، نويسنده , , K.M. Baik، نويسنده , , B. Bassalleck، نويسنده , , J.H. Chung، نويسنده , , M.S. Chung، نويسنده , , K. Hoshino، نويسنده , , M. Ieiri، نويسنده , , K. Imai، نويسنده , , Y.H. Iwata، نويسنده , , Y.S. Iwata، نويسنده , , H. Kanda، نويسنده , , M. Kaneko، نويسنده , , T. Kawai ، نويسنده , , C.O. Kim، نويسنده , , JY Kim، نويسنده , , et al.، نويسنده ,
Abstract :
A hybrid emulsion experiment was carried out to study double-strangeness nuclei produced via Ξ− hyperon capture at rest with the expectation of ten times larger statistics than previous experiments. We have analyzed 5% of the total emulsion and found one “twin-hypernuclei” event involving the emission of two single-Λ hypernuclei and a nuclear fragment from a Ξ− hyperon stopping point. The event is interpreted as the decay of a Ξ−+14N atomic system to 5ΛHe+5ΛHe+4He+neutron. The species of the Ξ−-atom and the fragmentation products are uniquely identified for the first time for twin-hypernuclei events. Combined with the results from a past hybrid-emulsion experiment, one double-Λ hypernucleus and three twin-hypernuclei events have been found from Ξ− captures on light emulsion nuclei. The ratio of the detected rate of double-Λ hypernuclei to that of twin-hypernuclei is compared with theoretical estimates.
