We show that reactive molecules with a unit probability of reaction naturally
    provide a simulator of some intriguing black hole physics. The unit reaction at
    the short distance acts as an event horizon and delivers a one-way traffic for
    matter waves passing through the potential barrier when two molecules interact
    by high partial-wave scatterings or dipole-dipole interactions. In particular,
    the scattering rate as a function of the incident energy exhibits a
    thermal-like distribution near the maximum of the interaction energy in the
    same manner as a scalar field scatters with the potential barrier outside the
    event horizon of a black hole. Such a thermal-like scattering can be extracted
    from the temperature-dependent two-body loss rate measured in experiments on
    KRb and other molecules.

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