Explanipedia

Search for Diffuse Supernova Neutrino Background with 956.2 days of Super-Kamiokande Gadolinium Dataset Open

K. Abe, Y Asaoka, Y. Asaoka, Y. Hayato, K Hiraide , et al. · 2025

We report the search result for the Diffuse Supernova Neutrino Background (DSNB) in neutrino energies beyond 9.3~MeV in the gadolinium-loaded Super-Kamiokande (SK) detector with $22,500\times956.2$$~\rm m^3\cdot day$ exposure. %$22.5{\rm k…

First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data Open

K. Abe, S Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2025

The Super-Kamiokande and T2K collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and corr…

Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector Open

H. Kitagawa, T Tada, K. Abe, C. Bronner, Y. Hayato , et al. · 2024

We present the results of the charge ratio (R) and polarization (P0μ) measurements using decay electron events collected between September 2008 and June 2022 with the Super-Kamiokande detector. Because of its underground location and long …

Development of a Data Overflow Protection System for Super-Kamiokande to Maximize Data from Nearby Supernovae Open

M. Mori, K. Abe, Y. Hayato, K. Hiraide, K. Hosokawa , et al. · 2024

Neutrinos from very nearby supernovae, such as Betelgeuse, are expected to generate more than ten million events over 10 s in Super-Kamokande (SK). At such large event rates, the buffers of the SK analog-to-digital conversion board (QBEE) …

New methods and simulations for cosmogenic induced spallation removal in Super-Kamiokande-IV Open

S. Locke, A. Coffani, K. Abe, C. Bronner, Y. Hayato , et al. · 2024

Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for O(10 MeV) neutrino interactions in water Cherenkov detectors. In particular, it is crucial to reduce backgrounds to measure the solar neutrino spectru…

Performance of SK-Gd’s Upgraded Real-time Supernova Monitoring System Open

Yuri Kashiwagi, K. Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2024

Among multimessenger observations of the next Galactic core-collapse supernova, Super-Kamiokande (SK) plays a critical role in detecting the emitted supernova neutrinos, determining the direction to the supernova (SN), and notifying the as…

Second gadolinium loading to Super-Kamiokande Open

K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa , et al. · 2024

The first loading of gadolinium (Gd) into Super-Kamiokande in 2020 was successful, and the neutron capture efficiency on Gd reached 50%. To further increase the Gd neutron capture efficiency to 75%, 26.1 tons of Gd2(SO4)3.8H2O was addition…

Solar neutrino measurements using the full data period of Super-Kamiokande-IV Open

K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa , et al. · 2024

An analysis of solar neutrino data from the fourth phase of Super-Kamiokande (SK-IV) from October 2008 to May 2018 is performed and the results are presented. The observation time of the dataset of SK-IV corresponds to 2970 days and the to…

Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I–V Open

T. Wester, K. Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2024

We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from the complete pure-water SK I–V (April 1996–July 2020) dataset, including events from an expanded fiducial volum…

Second gadolinium loading to Super-Kamiokande Open

K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa , et al. · 2024

The first loading of gadolinium (Gd) into Super-Kamiokande in 2020 was\nsuccessful, and the neutron capture efficiency on Gd reached 50\\%. To further\nincrease the Gd neutron capture efficiency to 75\\%, 26.1 tons of $\\rm Gd_2(\\rm\nSO_4…

Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment Open

S. Sakai, K. Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2024

We report the first measurement of the atmospheric neutrino-oxygen neutral-current quasielastic (NCQE) cross section in the gadolinium-loaded Super-Kamiokande (SK) water Cherenkov detector. In June 2020, SK began a new experimental phase, …

Solar neutrino measurements using the full data period of Super-Kamiokande-IV Open

Kamiokande Collaboration, K. Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2023

An analysis of solar neutrino data from the fourth phase of Super-Kamiokande~(SK-IV) from October 2008 to May 2018 is performed and the results are presented. The observation time of the data set of SK-IV corresponds to $2970$~days and the…

Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V Open

Kamiokande Collaboration, T. Wester, K. Abe, C. Bronner, Y. Hayato , et al. · 2023

We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from the complete pure-water SK I-V (April 1996-July 2020) data set, including events from an expanded fiducial volu…

Search for Periodic Time Variations of the Solar $^8$B Neutrino Flux between 1996 and 2018 in Super-Kamiokande Open

K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa , et al. · 2023

We report a search for time variations of the solar $^8$B neutrino flux using 5804 live days of Super-Kamiokande data collected between May 31, 1996, and May 30, 2018. Super-Kamiokande measured the precise time of each solar neutrino inter…

Erratum: Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande [Phys. Rev. Lett. <b>130</b>, 031802 (2023)] Open

K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda , et al. · 2023

This corrects the article DOI: 10.1103/PhysRevLett.130.031802.

Search for Astrophysical Electron Antineutrinos in Super-Kamiokande with 0.01% Gadolinium-loaded Water Open

Masayuki Harada, K. Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2023

We report the first search result for the flux of astrophysical electron antineutrinos for energies in the gadolinium-loaded Super-Kamiokande (SK) detector. In 2020 June, gadolinium was introduced to the ultrapure water of the SK det…

Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande Open

K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda , et al. · 2023

We report a search for cosmic-ray boosted dark matter with protons using the 0.37 megaton×years data collected at Super-Kamiokande experiment during the 1996-2018 period (SKI-IV phase). We searched for an excess of proton recoils above the…

Search for proton decay via in 0.37 megaton-years exposure of Super-Kamiokande Open

R. Matsumoto, K. Abe, Y. Hayato, K. Hiraide, K. Ieki , et al. · 2022

We searched for proton decay via p→μ+K0 in 0.37 Mton·years of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately for KS0 and KL0 channels. No significan…

Searching for Supernova Bursts in Super-Kamiokande IV Open

M. Mori, K. Abe, Y. Hayato, K. Hiraide, K. Ieki , et al. · 2022

Super-Kamiokande has been searching for neutrino bursts characteristic of core-collapse supernovae continuously, in real time, since the start of operations in 1996. The present work focuses on detecting more distant supernovae whose event…

Pre-supernova Alert System for Super-Kamiokande Open

L. N. Machado, K. Abe, Y. Hayato, K. Hiraide, K. Ieki , et al. · 2022

In 2020, the Super-Kamiokande (SK) experiment moved to a new stage (SK-Gd) in which gadolinium (Gd) sulfate octahydrate was added to the water in the detector, enhancing the efficiency to detect thermal neutrons and consequently improving …

Search for supernova bursts in Super-Kamiokande IV Open

Kamiokande Collaboration, M. Mori, K. Abe, Y. Hayato, K. Hiraide , et al. · 2022

Super-Kamiokande has been searching for neutrino bursts characteristic of core-collapse supernovae continuously, in real time, since the start of operations in 1996. The present work focuses on detecting more distant supernovae whose event…

Testing Non-Standard Interactions Between Solar Neutrinos and Quarks with Super-Kamiokande Open

P. Weatherly, C. Bronner, Y. Hayato, K. Hiraide, M. Ikeda , et al. · 2022

Non-Standard Interactions (NSI) between neutrinos and matter affect the neutrino flavor oscillations. Due to the high matter density in the core of the Sun, solar neutrinos are suited to probe these interactions. Using the $277$ kton-yr ex…

First gadolinium loading to Super-Kamiokande Open

K. Abe, C. Bronner, Y. Hayato, K. Hiraide, M. Ikeda , et al. · 2022

First gadolinium loading to Super-Kamiokande Open

K. Abe, C. Bronner, Y. Hayato, K. Hiraide, M. Ikeda , et al. · 2021

Diffuse supernova neutrino background search at Super-Kamiokande Open

K. Abe, C. Bronner, Y. Hayato, K. Hiraide, M. Ikeda , et al. · 2021

We have conducted a new search for the diffuse supernova neutrino background (DSNB) flux at Super-Kamiokande (SK), with a \n22.5 \n× \n2970 \n− \nkton \n⋅ \nday \n exposure from its fourth operational phase IV. With the new analysis we im…

New Methods and Simulations for Cosmogenic Induced Spallation Removal in Super-Kamiokande-IV Open

S. Locke, A. Coffani, K. Abe, C. Bronner, Y. Hayato , et al. · 2021

Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for $\mathcal{O}(10)~$MeV neutrino interactions in water Cherenkov detectors. In particular, it is crucial to reduce backgrounds to measure the solar neutr…

Low energy radioactivity BG model in Super-Kamiokande detector from SK-IV data Open

G. Pronost, K. Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2021

The radioactivity background are among the most dangerous background for low energy neutrino analysis in Super-Kamiokande (SK), like the solar neutrino analysis. Among them, the main contribution is coming from $^{222}$Rn, which is spread …

Diffuse Supernova Neutrino Background search at Super-Kamiokande with neutron tagging Open

A. Giampaolo, Sonia El Hedri, K. Abe, C. Bronner, Y. Hayato , et al. · 2021

Detecting the Diffuse Supernova Neutrino Background at Super-Kamiokande requires designing state-of-the-art background removal technique to reject radioactivity induced by cosmic muon spallation, and identify atmospheric neutrino interacti…

Follow-up of GWTC-2 gravitational wave events with neutrinos from the Super-Kamiokande detector Open

M. Lamoureux, K. Abe, C. Bronner, Y. Hayato, K. Hiraide , et al. · 2021

Super-Kamiokande (SK) is a 50-kt water Cherenkov detector, instrumented with $\sim 13$k photo-multipliers and running since 1996. It is sensitive to neutrinos with energies ranging from 4.5 MeV to several TeV. A new framework has been deve…

Search for Tens of MeV Neutrinos associated with Gamma-Ray Bursts in Super-Kamiokande Open

A. Orii, K. Abe, C. Bronner, Y. Hayato, M. Ikeda , et al. · 2021

A search for neutrinos produced in coincidence with Gamma-Ray Bursts(GRB) was conducted with the Super-Kamiokande (SK) detector. Between December 2008 and March 2017, the Gamma-ray Coordinates Network recorded 2208 GRBs that occurred durin…

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