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We report measurements of the branching fractions of singlyCabibbo-suppressed decays $\Lambda_c^+ \to p \eta$ and $\Lambda_c^+ \to p\pi^0$ using the full Belle data sample corresponding to an integratedluminosity of 980.6 $\rm fb^{-1}$. The data were collected by the Belledetector at the KEKB $e^{+}$$e^{-}$ asymmetric-energy collider. A clear$\Lambda_c^+$ signal is seen in the invariant mass distribution of $p \eta$.The signal yield of the $\Lambda_c^+ \to p \eta$ process is $7734 \pm 263$;from this, we measure the ratio of branching fractions ${\cal B}(\Lambda_c^+\to p \eta)/{\cal B}(\Lambda_c^+ \to p K^- \pi^+) = (2.258 \pm 0. 077(\rm stat.) \pm 0.136(\rm syst. ))\times 10^{-2}$, from which we infer the branchingfraction ${\cal B}(\Lambda_c^+ \to p \eta) = (1.42 \pm 0.05(\rm stat.) \pm0.11(\rm syst.)) \times 10^{-3}$. In addition, no significant signal for$\Lambda_c^+ \to p \pi^0$ is found so an upper limit on the branching fractionof ${\cal B}(\Lambda_c^+ \to p \pi^0)<8.0 \times 10^{-5}$ at 90\% credibilitylevel is set, more than three times better than the best current upper limit.

Measurements of the branching fractions of $\Lambda_c^+ \to p \eta$ and $\Lambda_c^+ \to p \pi^0$ decays at Belle