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The layered bismuth oxy-sulfide materials, which are structurally related tothe Fe-pnictides/chalcogenides and cuprates superconductors, have broughtsubstantial attention for understanding the physics of reduced dimensionalsuperconductors. We have examined the pairing symmetry of recently discoveredBiCh$_2$-based superconductor, La$_\mathrm{1-x}$Ce$_\mathrm{x}$OBiSSe with $x$= 0.3, through transverse field (TF) muon spin rotation measurement, inaddition we present the results of magnetization, resistivity and zero field(ZF) muon spin relaxation measurements. Bulk superconductivity has beenobserved below 2.7 K for $x$ = 0.3, verified by resistivity and magnetizationdata. The temperature dependence of the magnetic penetration depth has beendetermined from TF-$\mu$SR data can be described by an isotropic two-gap $s+s$wave model compared to a single gap $s$- or anisotropic $s$-wave models, theresemblance with Fe-pnictides/chalcogenides and MgB$_2$. Furthermore, from theTF-$\mu$SR data, we have determined the London's penetration depth$\lambda_\mathrm{L}(0)$ = 452(3) nm, superconducting carrier's density$n_\mathrm{s}$ = 2.18(1) $\times$10$^{26}$ carriers/m$^{3}$ and effective massenhancement $m^{*}$ = 1.66(1) $m_\mathrm{e}$, respectively. No signature ofspontaneous internal field is found down to 100 mK in ZF-$\mu$SR measurementsuggest that time-reversal symmetry is preserved in this system.

Multigap superconductivity in the new BiCh$_{2}$-based layered superconductor La$_\mathrm{0.7}$Ce$_\mathrm{0.3}$OBiSSe