Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

Abstract

A double-$\Lambda$ hypernucleus, ${}_{\Lambda \Lambda }\mathrm{Be}$, was observed by the J-PARC E07 collaboration in nuclear emulsions tagged by the $(K^{-},K^{+})$ reaction. This event was interpreted as a production and decay of ${}_{\Lambda \Lambda }^{10}\mathrm{Be}$, ${}_{\Lambda \Lambda }^{11}\mathrm{Be}$, or ${}_{\Lambda \Lambda }^{12}{\mathrm{Be}}^{\ast }$ via ${\Xi }^{-}$ capture in ${}^{16}\mathrm{O}$. By assuming the capture in the atomic 3D state, the binding energy of two $\Lambda$ hyperons($B_{\Lambda \Lambda }$) of these double-$\Lambda$ hypernuclei are obtained to be $15.05\pm 0.11\mathrm{MeV}$, $19.07\pm 0.11\mathrm{MeV}$, and $13.68\pm 0.11\mathrm{MeV}$, respectively. Based on the kinematic fitting, ${}_{\Lambda \Lambda }^{11}\mathrm{Be}$ is the most likely explanation for the observed event.

11 pages, 3 figures

References in corpus (2)

• On tadpoles and vacuum redefinitions in String Theory
• High Resolution Spectroscopic Study of ${}_{\Lambda }^{10}$Be

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