학술논문
Low-energy astrophysics with KamLAND
Document Type
article
Author
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, 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
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Subject
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Abstract
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.