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Angular scattering in charge exchange and elastic collisions betweeninterstellar ions and neutral (ISN) atoms has been assumed to be negligible inprevious studies. Here, we investigated the momentum transfer associated withthe angular scattering of H atoms using Monte Carlo calculations to simulatetheir transport through the outer heliosheath. We considered two cases wherecharge exchange and elastic collisions between ISN H atoms and protons occurwith and without momentum transfer in the outer heliosheath. We then simulatedthe transport of ISN H atoms inside the heliosphere to simulate count ratesobserved in the lowest energy bin of IBEX-Lo. We studied the effect ofradiation pressure on the ISN H measurements for the cases with and withoutmomentum transfer and compared them with our previous findings. We found aneffective radiation parameter ($\mu_{\scriptsize\textrm{eff}}$, whichrepresents for force associated with radiation pressure relative to gravity)for the years 2009-2018 based on the longitudinal shift of the ISN H signal.The two cases with and without momentum transfer reproduce the longitudinalshift in accordance with variations in solar activity, in agreement with ourprevious results, and they result in similar values for the$\mu_{\scriptsize\textrm{eff}}$, which is $\sim21-22 \%$ larger than the valuefound based on Ly$\alpha$ observations.

The Effect of Angular Scattering Imposed by Charge Exchange and Elastic Collisions on Interstellar Neutral Hydrogen Atoms