http://arxiv.org/abs/2204.12065
We present the results of a search for core-collapse supernova neutrinos, using long-term KamLAND data from 2002 March 9th to 2020 April 25th. We focus on the electron anti-neutrinos emitted from supernovae in the energy range of 1.8–111 MeV. Supernovae will make a neutrino event cluster with the length of $\sim$10 s in the KamLAND data. We find no neutrino clusters and give the upper limit on the supernova rate as to be 0.15 yr$^{-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 Salpter-type initial mass function, the upper limit on the galactic star formation rate is <17.5–22.7 (8.1–10.5) $M_{\odot} \mathrm{yr}^{-1}$ with a 90% (68.3%) confidence level.
S. Abe, S. Asami, M. Eizuka, et. al.
Wed, 27 Apr 22
18/68
Comments: 10 pages, 4 figures