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• W323982637 abstract "An experimental study of double-strangeness nuclei has been performed with a scintillating-fiber/emulsion hybrid method. The experiment has been carried out at the KEK 12 GeV proton synchrotron using a 1.66 GeV/c separated K− meson beam. We have completed the analysis of 32 % of total emulsion data, among which we have successfully observed three examples of the sequential weak decay of a double-hypernucleus and two events of the production of twin hypernuclei. The second double-hypernucleus event, named “Nagara event”, was interpreted uniquely as a 6 ΛΛHe double-hypernucleus (“Lambpha”, α). The binding energy of the two Λ hyperons, BΛΛ, and the Λ-Λ interaction energy, ∆BΛΛ, have been determined for the first time without the ambiguities arising from the possible production in excited states. The value of the Λ-Λ interaction energy was obtained as ∆BΛΛ = 1.01 ± 0.20 +0.18 −0.11 MeV, where the Ξ− binding energy of an atomic 3D state in C, 0.13 MeV, is used as the most probable value. It demonstrated that the Λ-Λ interaction is attractive but considerably weaker than that widely claimed. The lower limit of the mass of the H dibaryon has been obtained as 2223.7 MeV/c at a 90% confidence level. It narrowed the allowed mass region of the bound H dibaryon to only 7.7 MeV/c below the two-Λ mass. The weak decays of double-hypernuclei have been investigated experimentally for the first time with respect to the Λ-Λ weak interaction and the existence of the H nuclei. The search for the ΛΛ → Σ−p decay of double-hypernuclei has been performed by detecting the Σ− hyperon captures and decays in emulsion. Among 166 samples of the Ξ− capture events, no such event has been observed. The upper limit of the product of the probability of double-hypernuclear production from a Ξ− hyperon capture at rest in emulsion, P (Ξstop → ΛΛZ), and the branching ratio of the decay mode, Br(ΛΛ → Σ−p), has been obtained as P (Ξstop → ΛΛZ) ·Br(ΛΛ → Σ−p) < 2 % at a 90 % confidence level. With a rough estimation to the value of P (Ξstop → ΛΛZ) using the result of the previous emulsion experiment, the branching ratio was deduced to be Br(ΛΛ → Σ−p) < 12 %." @default.
• W323982637 created "2016-06-24" @default.
• W323982637 creator A5076043734 @default.
• W323982637 date "2003-03-24" @default.
• W323982637 modified "2023-09-23" @default.
• W323982637 title "Study of Double-Hypernuclei with Hybrid-Emulsion Method" @default.
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