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• W3207296757 abstract "The small binding energy of hypertrition leads to predictions of non-existence of bound hypernuclei for the isotriplet three-body system such as $nnLambda$. However, invariant mass spectroscopy at GSI reported events that may be interpreted as the bound $nnLambda$ state. The $nnLambda$ state was searched by missing-mass spectroscopy via the $(e,e'K^+)$ reaction at the Jefferson Lab's experimental Hall A. The present experiment has higher sensitivity to the $nnLambda$-state investigation in terms of the better precision by a factor of about three than the previous invariant mass spectroscopy. The analysis shown in this article focuses on the derivation of the reaction-cross section for the $^3{rm{H}}(gamma^{*},K^+)textrm{X}$ reaction. Events that were detected in an acceptance, where a Monte Carlo simulation could reproduce the data well ($|delta p/p| < 4%$), were analyzed to minimize the systematic uncertainty. No significant structures were observed with the acceptance cuts, and the upper limit of the reaction-cross section of $nnLambda$ state was obtained to be $21$ and $31~rm{nb/sr}$ at the $90%$-confidence level when theoretical predictions of $(-B_{Lambda}, Gamma) = (0.25,0.8)$ and $(0.55, 4.7)$ MeV, respectively, were assumed. The cross-section result provides valuable information to examine the existence of $nnLambda$." @default.
• W3207296757 created "2021-10-25" @default.
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• W3207296757 date "2021-10-18" @default.
• W3207296757 modified "2023-09-27" @default.
• W3207296757 title "The cross-section measurement for the $^3{rm H}(e,e'K^+)nnLambda$ reaction" @default.
• W3207296757 cites W1917270855 @default.
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• W3207296757 hasPublicationYear "2021" @default.
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