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A double-$Lambda$ hypernucleus, ${}_{LambdaLambda}mathrm{Be}$, 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 $ {}_{LambdaLambda}^{;10}mathrm{Be}$, ${}_{LambdaLambda}^{;11}mathrm{Be}$, or ${}_{LambdaLambda}^{;12}mathrm{Be}^{*}$ via $Xi^{-}$ capture in ${}^{16}mathrm{O}$. By assuming the capture in the atomic 3D state, the binding energy of two $Lambda$ hyperons$,$($B_{LambdaLambda}$) 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, ${}_{LambdaLambda}^{;11}mathrm{Be}$ is the most likely explanation for the observed event.
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of a neutron-rich hypernucleus, He 7 Lambd
Nuclear collisions recreate conditions in the universe microseconds after the Big Bang. Only a very small fraction of the emitted fragments are light nuclei, but these states are of fundamental interest. We report the observation of antihypertritons
The neutron lifetime is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure the lifetime with the goal precision of 0.1% at the
Search for the neutron-rich hypernucleus 9LHe is reported by the FINUDA experiment at DAFNE, INFN-LNF, studying (pi+, pi-) pairs in coincidence from the K-stop + 9Be --> 9LHe + pi+ production reaction followed by 9LHe --> 9Li + pi- weak decay. An upp
Study of in-medium mass modification has attracted interest in terms of the restoration of the spontaneously broken chiral symmetry, which is responsible for the generation of hadron mass. Many experiments were performed to measure in-medium property