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A search is presented for new phenomena in events characterised by high jetmultiplicity, no leptons (electrons or muons), and four or more jetsoriginating from the fragmentation of $b$-quarks ($b$-jets). The search uses139 fb$^{-1}$ of $\sqrt{s}$ = 13 TeV proton-proton collision data collected bythe ATLAS experiment at the Large Hadron Collider during Run 2. The dominantStandard Model background originates from multijet production and is estimatedusing a data-driven technique based on an extrapolation from events with low$b$-jet multiplicity to the high $b$-jet multiplicities used in the search. Nosignificant excess over the Standard Model expectation is observed and 95%confidence-level limits that constrain simplified models of R-parity-violatingsupersymmetry are determined. The exclusion limits reach 950 GeV in top-squarkmass in the models considered.

Search for phenomena beyond the Standard Model in events with large $b$-jet multiplicity using the ATLAS detector at the LHC