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With the imminent construction of the Deep Underground Neutrino Experiment(DUNE) and Hyper-Kamiokande, nucleon decay searches as a means to constrainbeyond Standard Model (BSM) extensions are once again at the forefront offundamental physics. Abundant neutrons within these large experimental volumes,along with future high-intensity neutron beams such as the European SpallationSource, offer a powerful, high-precision portal onto this physics throughsearches for $\mathcal{B}$ and $\mathcal{B}-\mathcal{L}$ violating processessuch as neutron--antineutron transformations ($n\rightarrow\bar{n}$), a keyprediction of compelling theories of baryogenesis. With this in mind, thispaper discusses a novel and self-consistent intranuclear simulation of thisprocess within ${}^{40}_{18} Ar$, which plays the role of both detector andtarget within DUNE's gigantic liquid argon time projection chambers. Anaccurate and independent simulation of the resulting intranuclear annihilationrespecting important physical correlations and cascade dynamics for this largenucleus is necessary to understand the viability of such rare searches whencontrasted against background sources such as atmospheric neutrinos. Recenttheoretical improvements to our model, including the first calculation of${}^{40}_{18} Ar$'s $\bar{n}$-intranuclear suppression factor, and Monte Carlosimulation comparisons to another publicly available $n\rightarrow\bar{n}$generator within GENIE, are also discussed.

Progress and Simulations for Intranuclear Neutron--Antineutron Transformations in ${}^{40}_{18} Ar$