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Exclusive Measurement of the Nonmesonic Weak Decay of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:mi>Λ</mml:mi><mml:mn>5</mml:mn></mml:mmultiscripts></mml:math>Hypernucleus
We performed a coincidence measurement of two nucleons emitted from the nonmesonic weak decay of $_{\ensuremath{\Lambda}}^{5}\mathrm{He}$ formed via the $^{6}\mathrm{Li}({\ensuremath{\pi}}^{+},{K}^{+})$ reaction. The energies of the two nucleons and the pair number distributions in the opening angle between them were measured. In both $np$ and $nn$ pairs, we observed a clean …