%AAbe, S.%AAsami, S.%AEizuka, M.%AFutagi, S.%AGando, A.%AGando, Y.%AGima, T.%AGoto, A.%AHachiya, T.%AHata, K.%AHosokawa, K.%AIchimura, K.%AIeki, S.%AIkeda, H.%AInoue, K.%AIshidoshiro, K.%AKamei, Y.%AKawada, N.%AKishimoto, Y.%AKoga, M.%AKurasawa, M.%AMaemura, N.%AMitsui, T.%AMiyake, H.%ANakahata, T.%ANakamura, K.%ANakamura, K.%ANakamura, R.%AOzaki, H.%ASakai, T.%ASambonsugi, H.%AShimizu, I.%AShirai, J.%AShiraishi, K.%ASuzuki, A.%ASuzuki, Y.%ATakeuchi, A.%ATamae, K.%AWatanabe, H.%AYoshida, Y.%AObara, S.%AIchikawa, A.%AYoshida, S.%AUmehara, S.%AFushimi, K.%AKotera, K.%AUrano, Y.%ABerger, B.%AFujikawa, B.%ALearned, J.%AMaricic, J.%AAxani, S.%AWinslow, L.%AFu, Z.%ASmolsky, J.%AEfremenko, Y.%AKarwowski, H.%AMarkoff, D.%ATornow, W.%ALi, A.%ADetwiler, J.%AEnomoto, S.%ADecowski, M.%AGrant, C.%ASong, H.%AO’Donnell, T.%ADell’Oro, S.%BJournal Name: The Astrophysical Journal; Journal Volume: 934; Journal Issue: 1 %D2022%I %JJournal Name: The Astrophysical Journal; Journal Volume: 934; Journal Issue: 1 %K %MOSTI ID: 10346643 %PMedium: X %TSearch for Supernova Neutrinos and Constraint on the Galactic Star Formation Rate with the KamLAND Data %XAbstract We present the results of a search for core-collapse supernova neutrinos, using long-term KamLAND data from 2002 March 9 to 2020 April 25. We focus on the electron antineutrinos emitted from supernovae in the energy range of 1.8–111 MeV. Supernovae will make a neutrino event cluster with the duration of ∼10 s in the KamLAND data. We find no neutrino clusters and give the upper limit on the supernova rate to be 0.15 yr −1 with a 90% confidence level. The detectable range, which corresponds to a >95% detection probability, is 40–59 kpc and 65–81 kpc for core-collapse supernovae and failed core-collapse supernovae, respectively. This paper proposes to convert the supernova rate obtained by the neutrino observation to the Galactic star formation rate. Assuming a modified Salpeter-type initial mass function, the upper limit on the Galactic star formation rate is <(17.5–22.7) M ⊙ yr −1 with a 90% confidence level. %0Journal Article