Publications (39)
A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector
T. I. Banks, S. J. Freedman, J. Wallig +54
We describe a compact, ultra-clean device used to deploy radioactive sources along the vertical axis of the KamLAND liquid-scintillator neutrino detector for purposes of calibratio…
Abundances of uranium and thorium elements in Earth estimated by geoneutrino spectroscopy
S. Abe, S. Asami, M. Eizuka +64
The decay of the primordial isotopes , , , and have contributed to the terrestrial heat budget throughout t…
Limits on astrophysical antineutrinos with the KamLAND experiment
S. Abe, S. Asami, A. Gando +66
We report on a search for electron antineutrinos () from astrophysical sources in the neutrino energy range 8.3 to 30.8 MeV with the KamLAND detector. In an exposure of 6…
Spin Ordering in LaOFeAs and Its Suppression in Superconductor LaO0.89F0.11FeAs Probed by Mössbauer Spectroscopy
S. Kitao, Y. Kobayashi, S. Higashitaniguchi +6
The 57Fe Mössbauer spectroscopy was applied to an iron-based layered superconductor LaO0.89F0.11FeAs with a transition temperature of 26 K and its parent material LaOFeAs. Through…
Local Flux of Low-Energy Antiprotons from Evaporating Primordial Black Holes
K. Maki, T. Mitsui, S. Orito
We investigate low-energy cosmic-ray antiprotons ('s) arising from the fragmentation of quarks and gluons emitted from evaporating primordial black holes (PBHs). To calcul…
Search for Charged Excited States of Dark Matter with KamLAND-Zen
Zen collaboration, S. Abe, M. Eizuka +64
Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter () accompanied by a negatively charged excited state ($Ï^{-}…
Neutrinoless Double Beta Decay
C. Adams, K. Alfonso, C. Andreoiu +229
This White Paper, prepared for the Fundamental Symmetries, Neutrons, and Neutrinos Town Meeting related to the 2023 Nuclear Physics Long Range Plan, makes the case for double beta…
Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events
S. Abe, S. Asami, A. Gando +65
We present the results of a search for MeV-scale electron antineutrino events in KamLAND in coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo c…
7Be Solar Neutrino Measurement with KamLAND
A. Gando, Y. Gando, H. Hanakago +68
We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7Be solar neutrinos based on a 165.4 kton-day exposure of KamLAND. The observed rate is 582 +/-…
Precise Measurements of Atmospheric Muon Fluxes with the BESS Spectrometer
M. Motoki, T. Sanuki, S. Orito +36
The vertical absolute fluxes of atmospheric muons and muon charge ratio have been measured precisely at different geomagnetic locations by using the BESS spectrometer. The observat…
KamLAND's search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube
S. Abe, S. Asami, M. Eizuka +66
We report the results of a search for MeV-scale astrophysical neutrinos in KamLAND presented as an excess in the number of coincident neutrino interactions associated with the publ…
Search for Solar Flare Neutrinos with the KamLAND detector
S. Abe, S. Asami, A. Gando +65
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 colle…
Element-Specific Phonon Density of States of Iron in LaFeAsO_{1-x}F_{x} and La_{1-x}Ca_{x}FePO
S. Higashitaniguchi, M. Seto, S. Kitao +8
We have measured element-specific Fe-phonon densities of states (Fe-PDOS) of LaFeAsO_{1-x}F_{x} (x = 0, 0.11) and La_{1-x}Ca_{x}FePO (x = 0.13) by using nuclear resonant inelastic…
Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen
Zen Collaboration, S. Abe, S. Asami +70
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta () decay half-life in Xe using a xenon-loaded liquid scintillator. We…
KamLAND Sensitivity to Neutrinos from Pre-Supernova Stars
K. Asakura, A. Gando, Y. Gando +44
In the late stages of nuclear burning for massive stars ($M>8~M_{\sun}$), the production of neutrino-antineutrino pairs through various processes becomes the dominant stellar cooli…
White paper: CeLAND - Investigation of the reactor antineutrino anomaly with an intense 144Ce-144Pr antineutrino source in KamLAND
A. Gando, Y. Gando, S. Hayashida +57
We propose to test for short baseline neutrino oscillations, implied by the recent reevaluation of the reactor antineutrino flux and by anomalous results from the gallium solar neu…
A search for correlated low-energy electron antineutrinos in KamLAND with gamma-ray bursts
S. Abe, S. Asami, A. Gando +64
We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts from the Gamma-ray Coordinates Network…
Search for supernova neutrinos and constraint on the galactic star formation rate with the KamLAND data
S. Abe, S. Asami, M. Eizuka +63
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 em…
CeLAND: search for a 4th light neutrino state with a 3 PBq 144Ce-144Pr electron antineutrino generator in KamLAND
A. Gando, Y. Gando, S. Hayashida +63
The reactor neutrino and gallium anomalies can be tested with a 3-4 PBq (75-100 kCi scale) 144Ce-144Pr antineutrino beta-source deployed at the center or next to a large low-backgr…
Study of electron anti-neutrinos associated with gamma-ray bursts using KamLAND
K. Asakura, A. Gando, Y. Gando +45
We search for electron anti-neutrinos () from long and short-duration gamma-ray bursts~(GRBs) using data taken by the KamLAND detector from August 2002 to June 2013.…
Precision Measurement of Cosmic-Ray Antiproton Spectrum
S. Orito, T. Maeno, H. Matsunaga +31
The energy spectrum of cosmic-ray antiprotons has been measured in the range 0.18 to 3.56 GeV, based on 458 antiprotons collected by BESS in recent solar-minimum period. We have de…
Isochronous mass spectrometry at the RIKEN Rare-RI Ring facility
D. Nagae, S. Omika, Y. Abe +28
A dedicated isochronous storage ring, named the Rare-RI Ring, was constructed at the RI Beam Factory of RIKEN, aiming at precision mass measurements of nuclei located in uncharted…
Laboratory Studies on the Removal of Radon-Born Lead from KamLAND's Organic Liquid Scintillator
G. Keefer, C. Grant, A. Piepke +64
The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques develope…
Large-Area Scintillator Hodoscope with 50 ps Timing Resolution Onboard BESS
Y. Shikaze, S. Orito, T. Mitsui +7
We describe the design and performance of a large-area scintillator hodoscope onboard the BESS rigidity spectrometer; an instrument with an acceptance of 0.3 m^{2}sr. The hodoscope…
First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND
KamLAND Collaboration, S. Abe, S. Asami +61
We report a measurement of the strange axial coupling constant using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neut…
Measurement of the 8B Solar Neutrino Flux with the KamLAND Liquid Scintillator Detector
KamLAND Collaboration, S. Abe, K. Furuno +77
We report a measurement of the neutrino-electron elastic scattering rate from 8B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron rec…
Thermodynamic Signatures of Diagonal Nematicity in RbFeAs Superconductor
Y. Mizukami, O. Tanaka, K. Ishida +10
Electronic nematic states with broken rotational symmetry often emerge in correlated materials. In most iron-based superconductors, the nematic anisotropy is oriented in the Fe-Fe…
A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector
S. Abe, S. Asami, A. Gando +68
There are many theories where a dark matter particle is part of a multiplet with an electrically charged state. If WIMP dark matter () is accompanied by a charged excited s…
Expected Enhancement of the Primary Antiproton Flux at the Solar Minimum
T. Mitsui, K. Maki, S. Orito
We calculate the solar-modulated energy spectra of cosmic-ray antiprotons ('s) from two candidate primary sources, i.e., evaporating primordial black holes and the annihil…
Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment
Zen Collaboration, A. Gando, Y. Gando +37
We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (s…
Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring
D. Nagae, Y. Abe, S. Okada +28
An electrostatic time-of-flight detector named E-MCP has been developed for quick diagnostics of circulating beam and timing measurement in mass spectrometry at the Rare-RI Ring in…
Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND
Zen Collaboration, S. Abe, S. Asami +63
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…
Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset
S. Abe, T. Araki, K. Chiba +69
We present a search for neutrinoless double-beta () decay of Xe using the full \mbox{KamLAND-Zen 800} dataset with 745\,kg of enriched xenon, corresponding to an e…
Precise Measurement of Cosmic-Ray Proton and Helium Spectra with the BESS Spectrometer
T. Sanuki, M. Motoki, H. Matsumoto +31
We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120 GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of the BESS spectrometer in 1998…
Limits on the Low-Energy Electron Antineutrino Flux from the Brightest GRB of All Time
T. Araki, S. Chauhan, K. Chiba +69
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 Scintillat…
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
Zen Collaboration, K. Asakura, A. Gando +42
A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0+1, 2+1 and 2+2 transitions…
Search for electron antineutrinos associated with gravitational wave events GW150914 and GW151226 using KamLAND
KamLAND Collaboration, A. Gando, Y. Gando +45
We present a search for low energy antineutrino events coincident with the gravitational wave events GW150914 and GW151226, and the candidate event LVT151012 using KamLAND, a kilot…
Measurements of Cosmic-ray Low-energy Antiproton and Proton Spectra in a Transient Period of the Solar Field Reversal
Y. Asaoka, Y. Shikaze, K. Abe +39
The energy spectra of cosmic-ray low-energy antiprotons and protons have been measured by BESS in 1999 and 2000, during a period covering the solar magnetic field reversal. Based o…
The nylon balloon for xenon loaded liquid scintillator in KamLAND-Zen 800 neutrinoless double-beta decay search experiment
Zen collaboration, Y. Gando, A. Gando +70
The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of Xe by using Xe-loaded liquid scintillator. The liquid scintillator is enclosed…