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Whether binary neutron star mergers are the only astrophysical site of rapidneutron-capture process ($r$-process) nucleosynthesis remains unknown.Collapsars associated with long gamma-ray bursts (GRBs) and hypernovae arepromising candidates. Simulations have shown that outflows from collapsaraccretion disks can produce enough $r$-process materials to explain theabundances in the universe. However, there is no observational evidence toconfirm this result at present. SN 2020bvc is a broad-lined type Ic (Ic-BL)supernova (SN) possibly associated with a low-luminosity GRB. Based onsemi-analytic SN emission models with and without $r$-process materials, weperform a fitting to the multi-band light curves and photospheric velocities ofSN 2020bvc. We find that in a $r$-process-enriched model the mixing of$r$-process materials slows down the photospheric recession and thereforematches the velocity evolution better. The fitting results show that$r$-process materials with mass of $\approx0.36~M_\odot$ and opacity of$\approx4~\rm cm^2~g^{-1}$ is needed to mix with about half of the SN ejecta.Our fitting results are weakly dependent on the nebular emission. Futurestatistical analysis of a sample of type Ic-BL SNe helps us understand thecontribution of collapsars to the $r$-process abundance.

Photospheric velocity evolution of SN 2020bvc: signature of $r$-process nucleosynthesis from a collapsar