def detailed_balance_factor(self):
        r"""Returns the detailed balance factor (sometimes called the Bose
        factor)

        Parameters
        ----------
            None

        Returns
        -------
        dbf : ndarray
            The detailed balance factor (temperature correction)

        """

        return 1. - np.exp(-self.Q[:, 3] / BOLTZMANN_IN_MEV_K / self.temp)