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View article: Launch and operation of the PIKACHU experiment to search for double beta decay in 160Gd
Launch and operation of the PIKACHU experiment to search for double beta decay in 160Gd Open
$^{160}$Gd is a candidate for double beta decay with relatively high natural abundance (21.9%). However, its low Q-value (1.73 MeV) makes the observation of even the two-neutrino double beta decay (2$\nu$2$\beta$) extremely challenging. Th…
View article: Erratum: “A Search for Electron Antineutrinos Associated with Gravitational-wave Events GW150914 and GW151226 Using KamLAND” (2016, ApJL, 829, L34)
Erratum: “A Search for Electron Antineutrinos Associated with Gravitational-wave Events GW150914 and GW151226 Using KamLAND” (2016, ApJL, 829, L34) Open
Erratum to: “A Search for Electron Antineutrinos Associated with Gravitational-wave Events GW150914 and GW151226 Using KamLAND”
View article: Limits on the Low-energy Electron Antineutrino Flux from the Brightest Gamma-Ray Burst of All Time
Limits on the Low-energy Electron Antineutrino Flux from the Brightest Gamma-Ray Burst of All Time Open
The electron antineutrino flux limits are presented for the brightest gamma-ray burst (GRB) of all time, GRB221009A, over a range of 1.8–200 MeV using the Kamioka Liquid Scintillator Antineutrino Detector. Using multiple time windows rangi…
View article: Simulation Tool Development and Sensitivity Analysis of 160Gd Double Beta Decay Search by the PIKACHU Project
Simulation Tool Development and Sensitivity Analysis of 160Gd Double Beta Decay Search by the PIKACHU Project Open
Neutrinoless double beta decay (0v2b) has been investigated as a physical process that can provide evidence for the Majorana nature of neutrinos. The theoretical predictions of the 0v2b rate are subject to significant uncertainty, primaril…
View article: Search for charged excited states of dark matter with KamLAND-Zen
Search for charged excited states of dark matter with KamLAND-Zen Open
View article: Limits on the Low-Energy Electron Antineutrino Flux from the Brightest GRB of All Time
Limits on the Low-Energy Electron Antineutrino Flux from the Brightest GRB of All Time Open
The electron antinuetrino flux limits are presented for the brightest gamma-ray burst (GRB) of all time, GRB221009A, over a range of 1.8-200 MeV using the Kamioka Liquid Scintillator Anti Neutrino Detector (KamLAND). Using a variety of tim…
View article: Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande
Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande Open
Preceding a core-collapse supernova (CCSN), various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potent…
View article: Search for charged excited states of dark matter with KamLAND-Zen
Search for charged excited states of dark matter with KamLAND-Zen Open
View article: Combined Pre-Supernova Alert System with Kamland and Super-Kamiokande
Combined Pre-Supernova Alert System with Kamland and Super-Kamiokande Open
Preceding a core-collapse supernova, various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially d…
View article: First Study of the PIKACHU Project: Development and Evaluation of High-Purity Gd3Ga3Al2O12:Ce Crystals for 160Gd Double Beta Decay Search
First Study of the PIKACHU Project: Development and Evaluation of High-Purity Gd3Ga3Al2O12:Ce Crystals for 160Gd Double Beta Decay Search Open
Uncovering neutrinoless double beta decay (0ν2β) is crucial for confirming neutrinos’ Majorana characteristics. The decay rate of 0νββ is theoretically uncertain, influenced by nuclear matrix elements that vary across nuclides. To reduce t…
View article: First Study of the PIKACHU Project: Development and Evaluation of High-Purity Gd$_3$Ga$_3$Al$_2$O$_{12}$:Ce Crystals for $^{160}$Gd Double Beta Decay Search
First Study of the PIKACHU Project: Development and Evaluation of High-Purity Gd$_3$Ga$_3$Al$_2$O$_{12}$:Ce Crystals for $^{160}$Gd Double Beta Decay Search Open
Uncovering neutrinoless double beta decay (0$ν$2$β$) is crucial for confirming neutrinos' Majorana characteristics. The decay rate of 0$νββ$ is theoretically uncertain, influenced by nuclear matrix elements that vary across nuclides. To re…
View article: Application of gamma Transition-Edge-Sensor (TES) to $^{112}$Sn two-neutrino double electron capture search
Application of gamma Transition-Edge-Sensor (TES) to $^{112}$Sn two-neutrino double electron capture search Open
Double electron capture (DEC) is a rare nuclear decay process in which two orbital electrons are simultaneously captured in the same nucleus.\nThe measurement of its two-neutrino emitting mode (2$\\nu$DEC) provides a new reference for the …
View article: Search for Charged Excited States of Dark Matter with KamLAND-Zen
Search for Charged Excited States of Dark Matter with KamLAND-Zen Open
Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter ($χ^{0}$) accompanied by a negatively charged excited state ($χ^{-}$) with a small mass difference (e.g. $<$ 20 MeV) can form a …
View article: Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND
Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND Open
Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-β decay, and dark matter search experiments. The KamLAND-Z…
View article: First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND
First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND Open
We report a measurement of the strange axial coupling constant $g_A^s$ using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of $…
View article: Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen
Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen Open
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in ^{136}Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost …
View article: KamLAND-Zen 800
KamLAND-Zen 800 Open
KamLAND-Zen searches for neutrinoless double beta decay with $^{136}$Xe loaded liquid scintillator.\nAfter the successful completion of KamLAND-Zen 400, KamLAND-Zen 800 started data taking in 2019 with almost double the amount of xenon and…
View article: Abundances of Uranium and Thorium Elements in Earth Estimated by Geoneutrino Spectroscopy
Abundances of Uranium and Thorium Elements in Earth Estimated by Geoneutrino Spectroscopy Open
The decay of the primordial isotopes 238 U, 235 U, 232 Th, and 40 K has contributed to the terrestrial heat budget throughout the Earth's history. Hence, the individual abundance of those isotopes are key parameters in reconstructing conte…
View article: KamLAND’s search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube
KamLAND’s search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube Open
View article: Search for Supernova Neutrinos and Constraint on the Galactic Star Formation Rate with the KamLAND Data
Search for Supernova Neutrinos and Constraint on the Galactic Star Formation Rate with the KamLAND Data Open
We present the results of a search for core-collapse supernova neutrinos, using long-term KamLAND data from 2002 March 9 to 2020 April 25. We focus on the electron antineutrinos emitted from supernovae in the energy range of 1.8–111 MeV. S…
View article: A Search for Correlated Low-energy Electron Antineutrinos in KamLAND with Gamma-Ray Bursts
A Search for Correlated Low-energy Electron Antineutrinos in KamLAND with Gamma-Ray Bursts Open
We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts (GRBs) from the Gamma-ray Coordinates Network and Fermi Gamma-ray Burst Monitor. Using a variable …
View article: Search for Solar Flare Neutrinos with the KamLAND Detector
Search for Solar Flare Neutrinos with the KamLAND Detector Open
We report the result of a search for neutrinos in coincidence with solar flares from the GOES flare database. The search was performed on a 10.8 kton-year exposure of KamLAND collected from 2002 to 2019. This large exposure allows us to ex…
View article: Limits on Astrophysical Antineutrinos with the KamLAND Experiment
Limits on Astrophysical Antineutrinos with the KamLAND Experiment Open
We report on a search for electron antineutrinos ( ) from astrophysical sources in the neutrino energy range 8.3–30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candi…
View article: Search for Solar Flare Neutrinos with the KamLAND Detector
Search for Solar Flare Neutrinos with the KamLAND Detector Open
We report the result of a search for neutrinos in coincidence with solar flares from the GOES flare database. The search was performed on a 10.8 kton-year exposure of KamLAND collected from 2002 to 2019. This large exposure allows us to ex…
View article: Low-energy astrophysics with KamLAND
Low-energy astrophysics with KamLAND Open
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 liq…
View article: Be 7 solar neutrino measurement with KamLAND
Be 7 solar neutrino measurement with KamLAND Open
In this article, we report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7Be solar neutrinos based on a 165.4 kt d exposure of KamLAND. The observed rate is 582 ± 94 (kt d) -1, which corresponds to an 862-keV 7B…
View article: Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events
Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events Open
We present the results of a search for MeV-scale electron antineutrino events in KamLAND coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo collaboration during their second and third observing runs. We …
View article: A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector
A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector Open
There are many theories where a dark matter particle is part of a multiplet with an electrically charged state. If WIMP dark matter ($χ^{0}$) is accompanied by a charged excited state ($χ^{-}$) separated by a small mass difference, it can …
View article: Inner balloon production for KamLAND-Zen 800
Inner balloon production for KamLAND-Zen 800 Open
KamLAND-Zen searches for neutrinoless double-beta decay with 136 Xe loaded liquid scintillator (LS). The LS container, a 25- μ m-thick clean nylon inner balloon is a key of the experiment since one of the main backgrounds in the ROI is 214…