Low-energy astrophysics with KamLAND

Journal Article · 18 March 2022 · PoS - Proceedings of Science

DOI: https://doi.org/10.22323/1.395.1163 · OSTI ID:1959024

Kawada, N; Obara, S; Ishidoshiro, K; Grant, C; O’Donnell, T; Dell’Oro, S; Abe, S; Asami, S; Gando, A; Gando, Y; Gima, T; Goto, A; Hachiya, T; Hata, K; Hayashida, S; Hosokawa, K; Ichimura, K; Ieki, S; Ikeda, H; Inoue, K ; Kamei, Y; Kishimoto, Y; Kinoshita, T; Koga, M; Maemura, N; Mitsui, T; Miyake, H; Nakamura, K; Nakamura, K; Nakamura, R; Ozaki, H; Sakai, T; Sambonsugi, H; Shimizu, I; Shirai, J; Shiraishi, K; Suzuki, A; Suzuki, Y; Takeuchi, A; Tamae, K; Ueshima, K; Wada, Y; Watanabe, H; Yoshida, Y; Ichikawa, AK; Kozlov, A; Chernyak, D; Takemoto, Y; Yoshida, S; Umehara, S; Fushimi, K; Nakamura, KZ; Yoshida, M; Berger, BE; Fujikawa, BK; Learned, JG; Maricic, J; Axani, SN; Winslow, LA; Fu, Z; Ouellet, J; Efremenko, Y; Karwowski, HJ; Markoff, DM; Tornow, W; Li, A; Detwiler, JA; Enomoto, S; Decowski, MP

We present two results of a search for MeV-scale neutrino and anti-neutrino events correlated with gravitational wave events/candidates and large solar flares with KamLAND. The KamLAND detector is a large-volume neutrino detector using liquid scintillator, which is located at 1 km underground under the top of Mt. Ikenoyama in Kamioka, Japan. KamLAND has multiple reaction channels to detect neutrinos. Electron antineutrino can be detected via inverse-beta decay with 1.8 MeV neutrino energy threshold. All flavors of neutrinos can be detected via neutrino-electron scattering without neutrino energy threshold. KamLAND has continued the neutrino observation since 2002 March. We use the data set of 60 gravitational waves provided by the LIGO/Virgo collaboration during their second and third observing runs and search for coincident electron antineutrino events in KamLAND. We find no significant coincident signals within a ±500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antineutrino fluence between 10⁸–10¹³ cm^-2 for neutrino energies of 1.8–111 MeV. For a solar-flare neutrino search at KamLAND, we determine the timing window using the solar X-ray data set provided by the GOES satellite series from 2002 to 2019 and search for the excess of coincident event rate on the all-flavor neutrinos. We find no significant event rate excess in the flare time windows and get 90% C.L. upper limits on the fluence of neutrinos of all flavors (electron anti-neutrinos) between 10¹⁰–10¹³ cm^-2 (10⁸–10¹³ cm^-2) for neutrino energies in the energy range of 0.4–35 MeV.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: KamLAND Collaboration
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1959024
• Journal Information: PoS - Proceedings of Science, Vol. 395; Conference: 37th International Cosmic Ray Conference (ICRC2021) , Berlin (Germany), 12-23 Jul 2021; ISSN 1824-8039
• Publisher: SISSACopyright Statement
• Country of Publication: United States
• Language: English