A5031905945- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Dark Matter and Cosmic Phenomena
University of California System
2024
University of California, Irvine
2021-2024
Abstract The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO–Virgo Collaboration (LVC). Both low-energy (7–100 MeV) and high-energy (0.1–10 5 GeV) samples were analyzed order cover a very wide neutrino spectrum. Follow-ups of 36 (out 39) reported GWTC-2 catalog examined; no significant excess above background was observed, 10 (24) observed compared 4.8 (25.0) expected events (low-energy) samples. A statistical...
Cosmic-ray muons that enter the Super-Kamiokande detector cause hadronic showers due to spallation in water, producing neutrons and radioactive isotopes. These are a major background source for studies of MeV-scale neutrinos searches rare events. In 2020, gadolinium was introduced into ultra-pure water improve detection efficiency neutrons. this study, cosmogenic neutron yield measured using data acquired during period after loading. The found be...
Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi mathvariant="script">O</a:mi><a:mo stretchy="false">(</a:mo><a:mn>10</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>MeV</a:mi><a:mo stretchy="false">)</a:mo></a:mrow></a:math> neutrino interactions in water Cherenkov detectors. In particular, it crucial to reduce measure the solar spectrum and find from distant...
We present the results of charge ratio ($R$) and polarization ($P^{\mu}_{0}$) measurements using decay electron events collected from 2008 September to 2022 June by Super-Kamiokande detector. Because its underground location long operation, we performed high precision accumulating cosmic-ray muons. measured muon be $R=1.32 \pm 0.02$ $(\mathrm{stat.}{+}\mathrm{syst.})$ at $E_{\mu}\cos \theta_{\mathrm{Zenith}}=0.7^{+0.3}_{-0.2}$ $\mathrm{TeV}$, where $E_{\mu}$ is energy...
Neutrinos associated with solar flares (solar-flare neutrinos) provide information on particle acceleration mechanisms during the impulsive phase of flares. We searched using Super-Kamiokande detector for neutrinos from that occurred cycles $23$ and $24$, including largest flare (X28.0) November 4th, 2003. In order to minimize background rate we neutrino interactions within narrow time windows coincident $\gamma$-rays soft X-rays recorded by satellites. addition, performed first attempt...