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Precise Measurement of the Λ-Binding-Energy Difference between _{Λ}^{3}H and _{Λ}^{4}H via Decay-Pion Spectroscopy at
Ryoko Kino1, Sho Nagao2,3, Patrick Achenbach4
1RIKEN Nishina Center for Accelerator-Based Science, Saitama 351-0198, Japan.
None:
We performed high-precision decay-pion spectroscopy of light Λ hypernuclei at the Mainz Microtron (MAMI) using the A1 spectrometer facility. By measuring the monochromatic π^{-} momentum from the two-body weak decay _{Λ}^{3}H→^{3}He+π^{-} and referencing it to the _{Λ}^{4}H→^{4}He+π^{-} decay, we determined the Λ binding energy of _{Λ}^{3}H with unprecedented accuracy. The obtained value, B_{Λ}(_{Λ}^{3}H)=0.523±0.013_{stat}±0.075_{syst}. MeV, is consistent with the STAR result, but indicates a significantly deeper binding than inferred from earlier measurements. This result implies a stronger Λ-deuteron interaction and provides stringent constraints on hyperon-nucleon interactions.
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