Erratum: Neutron and proton spectra from the decay

An error in the computer program which evaluated nucleon spectra following the decay of Λ hypernuclei has been detected. The error affected the final state interaction (FSI) of the nucleons, reducing by a factor ten the nucleon-nucleon (NN) collision probability. When correcting the error, some results and conclusions of Ref. [1] have changed substantially. In this erratum we present the corrected results, keeping the same numbering of the original figures to avoid confusion. The corrections affect figures 6 to 8 and 11 to 16, which we display below. In summary, the effect of FSI of the nucleons is much more important than in the old results. This has as consequences,