For single-channel local finite-range potentials with repulsive core and attractive tail, the effective range is strictly positive when scattering length a > R.
ImplicationofanegativeeffectiverangeontheDD ¯*interaction and the nature of X(3872).Phys
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Positivity of the effective range for finite range attractive potentials with a repulsive core
For single-channel local finite-range potentials with repulsive core and attractive tail, the effective range is strictly positive when scattering length a > R.