On the Binding Energies of $\Lambda$-Hyperons in Hyperhydrogen.
Patrick Achenbach, Josef Pochodzalla, Schulz, Florian · DESY (CERN, DESY, Fermilab, IHEP, and SLAC) · 2014
The study of the binding energies of the Λ-hyperon in the lightest hypernuclei can reveal details of the strong nucleon-hyperon interaction.The binding energy of the Λ-hyperon, B Λ , is defined as the Λ-hyperon separation energy from the non-strange core: B Λ = (M core + M Λ -M Y )c 2 where M Y , M core and M Λ are the masses of the hypernucleus, its core and the Λ-hyperon respectively.For many decades visual detectors like nuclear emulsions, with spatial resolutions better than one micrometer to track production and decay, and helium bubble chambers were employed.The masses of hypernuclei A < 14 were determined by analyzing the kinetic energies of decay products from the weak pionic decays.No bound states of Λp or Λn were found.The lightest systems are the s-shell (A ≤ 5) hyperhydrogen and hyperhelium isotopes.The statistical error for the binding energies in light hypernuclei with the emulsion method ranges from 0.02 MeV for 5 Λ He to more than 0.7 MeV for 8 Λ He [1-3].In one of these compilations a possible systematic error of 0.15 MeV [3] is quoted.In a later work by D.H. Davis systematic errors of the order of 0.04 MeV are given [4].