Abstract
Recent measurements suggest that the ground state of 10Li is a resonance which may well be wide enough to overlap the (n + 9Li) threshold. In this context we recall some of the curious properties of resonances located near threshold and entered from a non-decay channel, including their asymmetry and the fact that the peak observed in the cross section occurs at neither the R-matrix nor the S-matrix energy, but rather between the two. Because of these and other complications, it does not seem likely that either the ifℓ-value of the resonance or the energy of the corresponding state can accurately be determined from the shape of the resonance peak alone.
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