Journal ArticleAstrophysical Journal · October 1, 2024
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 potentially detectable ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · August 1, 2024
Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter (χ0) accompanied by a negatively charged excited state (χ−) with a small mass difference (e.g. < 20 MeV) can form a bound-state with a nucleus su ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · June 1, 2024
There is a global trend to increase the light yield of CsI scintillators used in neutrino and dark matter detection by operating undoped crystals at cryogenic temperatures. However, high light yield alone is not sufficient to guarantee a low-energy thresho ...
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Journal ArticlePhysical Review D · May 1, 2024
We consider the potential for a 10 kg undoped cryogenic CsI detector operating at the Spallation Neutron Source to measure coherent elastic neutrino-nucleus scattering and its sensitivity to discover new physics beyond the standard model (BSM). Through a c ...
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Journal ArticlePhysical review letters · December 2023
Using an 185-kg NaI[Tl] array, COHERENT has measured the inclusive electron-neutrino charged-current cross section on ^{127}I with pion decay-at-rest neutrinos produced by the Spallation Neutron Source at Oak Ridge National Laboratory. Iodine is one the he ...
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Journal ArticlePhysical Review D · October 1, 2023
Using neutrinos produced at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL), the COHERENT collaboration has studied the Pb(νe,Xn) process with a lead neutrino-induced-neutron (NIN) detector. Data from this detector are fit joint ...
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Journal ArticlePhysical Review C · May 1, 2023
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-Zen experiment sea ...
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Journal ArticlePhysical Review D · April 1, 2023
We report a measurement of the strange axial coupling constant gAs 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 gAs significantly chan ...
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Journal ArticlePhysical review letters · February 2023
The COHERENT Collaboration searched for scalar dark matter particles produced at the Spallation Neutron Source with masses between 1 and 220 MeV/c^{2} using a CsI[Na] scintillation detector sensitive to nuclear recoils above 9 keV_{nr}. No evidence for d ...
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Journal ArticlePhysical review letters · February 2023
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 double the amount ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · December 10, 2022
We report the most precise determination of the S01 neutron-neutron effective range parameter (rnn) from neutron-neutron quasifree scattering in neutron-deuteron breakup. The experiment setup utilized a collimated beam of 15.5 MeV neutrons and an array of ...
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Journal ArticleAstroparticle Physics · October 1, 2022
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 publicly available high-energy neutrino datasets from the IceCube Neutrino Obser ...
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Journal ArticleJournal of Instrumentation · October 1, 2022
We present results of several measurements of CsI[Na] scintillation response to 3-60 keV energy nuclear recoils performed by the COHERENT collaboration using tagged neutron elastic scattering experiments and an endpoint technique. Earlier results, used to ...
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Journal ArticlePhysical Review D · September 1, 2022
We use data from the COHERENT CsI[Na] scintillation detector to constrain sub-GeV leptophobic dark matter models. This detector was built to observe low-energy nuclear recoils from coherent elastic neutrino-nucleus scattering. These capabilities enable sea ...
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Journal ArticleGeophysical Research Letters · August 28, 2022
The decay of the primordial isotopes 238U, 235U, 232Th, and 40K has contributed to the terrestrial heat budget throughout the Earth's history. Hence, the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth models. ...
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Journal ArticlePhysical Review D · August 1, 2022
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a pulsed source of neutrons and, as a by-product of this operation, an intense source of pulsed neutrinos via stopped-pion decay. The COHERENT collaboration uses this source to investi ...
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Journal ArticlePhysical review letters · August 2022
We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in a high flux of neutrinos produced at the Spallation Neutron Source at Oak Ridge National Laboratory. New data collected before de ...
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Journal ArticleAstrophysical Journal · July 1, 2022
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. Supernovae will ma ...
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Journal ArticlePhysical review letters · April 2022
Differential cross sections for Compton scattering from the proton have been measured at scattering angles of 55°, 90°, and 125° in the laboratory frame using quasimonoenergetic linearly (circularly) polarized photon beams with a weighted mean energy value ...
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ConferenceProceedings of Science · March 18, 2022
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, ...
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Journal ArticleAstrophysical Journal · March 1, 2022
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 coincidence time ...
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Journal ArticleJournal of Instrumentation · March 1, 2022
We present the analysis and results of the first dataset collected with the MARS neutron detector deployed at the Oak Ridge National Laboratory Spallation Neutron Source (SNS) for the purpose of monitoring and characterizing the beam-related neutron (BRN) ...
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Journal ArticleAstrophysical Journal · January 20, 2022
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 candidate events via the inverse ...
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Journal ArticleAstrophysical Journal · January 10, 2022
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 explore previously ...
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Journal ArticleJournal of Instrumentation · August 1, 2021
We report on the technical design and expected performance of a 592 kg heavy-water-Cherenkov detector to measure the absolute neutrino flux from the pion-decay-at-rest neutrino source at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory ...
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Journal ArticleJournal of Instrumentation · August 1, 2021
The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of 136Xe by using 136Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner ...
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Journal ArticleAstrophysical Journal · March 10, 2021
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 find no significa ...
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Journal Article · October 21, 2020
We report on the preparation of and calibration measurements with a
$^{83\mathrm{m}}$Kr source for the CENNS-10 liquid argon detector.
$^{83\mathrm{m}}$Kr atoms generated in the decay of a $^{83}$Rb source were
introduced into the detector via injection in ...
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Journal Article · March 25, 2020
We report the first detection of coherent elastic neutrino-nucleus scattering
(CEvNS) on argon using the CENNS-10 liquid argon detector at the Oak Ridge
National Laboratory Spallation Neutron Source. Two independent analyses prefer
CEvNS over the backgroun ...
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Journal ArticlePhysical Review C · March 1, 2020
New measurements of the neutron-neutron quasifree scattering cross section in neutron-deuteron breakup at an incident neutron energy of 10.0 MeV are reported. The experiment setup was optimized to evaluate the technique for determining the integrated beam- ...
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Journal ArticlePhysical review letters · May 2019
We present a precision analysis of the ^{136}Xe two-neutrino ββ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino ββ rate allows us to measure the ratio of th ...
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Journal ArticlePhysical review. C · January 2019
Neutron spin rotation is expected from quark-quark weak interactions in the standard model, which induce weak interactions among nucleons that violate parity. We present the results from an experiment searching for the effect of parity violation via the sp ...
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ConferenceJournal of Physics: Conference Series · September 20, 2017
The COHERENT experiment is designed for a first measurement and N2 dependence study of coherent elastic neutrino-nucleus scattering (CEvNS) at the Oak Ridge Spallation Neutron Source (SNS). CEvNS is a standard model process that is important in understandi ...
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Journal ArticleAstrophysical Journal Letters · October 1, 2016
We present a search, using KamLAND, a kiloton-scale anti-neutrino detector, for low-energy anti-neutrino events that were coincident with the gravitational-wave (GW) events GW150914 and GW151226, and the candidate event LVT151012. We find no inverse beta-d ...
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Journal ArticlePhysical review letters · August 2016
We present an improved search for neutrinoless double-beta (0νββ) decay of ^{136}Xe in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the ^{110m}Ag contaminant identified in ...
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ConferenceEPJ Web of Conferences · March 25, 2016
We provide an update on the development of an experiment at TUNL for determining the 1S0 neutron-neutron (nn) scattering length (ann) from differential cross-section measurements of three-body photodisintegration of the triton. The experiment will be condu ...
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ConferenceEPJ Web of Conferences · March 25, 2016
The neutron-deuteron (nd) breakup reaction provides a rich environment for testing theoretical models of the neutron-neutron (nn) interaction. Current theoretical predictions based on rigorous ab-initio calculations agree well with most experimental data f ...
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Journal ArticleAstrophysical Journal · February 10, 2016
In the late stages of nuclear burning for massive stars (M > 8 Mȯ), the production of neutrino-antineutrino pairs through various processes becomes the dominant stellar cooling mechanism. As the star evolves, the energy of these neutrinos increases and in ...
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Journal ArticleNuclear Physics A · February 1, 2016
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 01+, 21+ and 22+ transitions of 0νββ decay were evaluated in an exposure of 89.5 kg⋅yr of 136Xe, while t ...
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Journal ArticlePhysical Review C - Nuclear Physics · November 30, 2015
We report a measurement of the neutrino-electron elastic scattering rate of 862 keV Be7 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 Be7 solar neutrino flux of (3.26±0.52)×1 ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · September 23, 2015
We present a search for the proton decay mode p→ν¯K+ based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from p→ν¯K+ with unique kinematics, which allow us to achieve a dete ...
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Journal ArticlePhysical Review C - Nuclear Physics · September 10, 2015
Measurements of the Be9(γ,n0) reaction were performed using nearly 100% linearly polarized, high-intensity, and nearly monoenergetic γ-ray beams having energies between 5.5 and 15.5 MeV at the High Intensity γ-ray Source located at Duke University and Tria ...
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ConferenceAIP Conference Proceedings · July 15, 2015
KamLAND-Zen reports on a preliminary search for neutrinoless double-beta decay with 136Xe based on 114.8 live-days after the purification of the xenon loaded liquid scintillator. In this data, the problematic 110mAg background peak identified in previous s ...
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Journal ArticleAstrophysical Journal · June 10, 2015
We search for electron anti-neutrinos (ne) from long-and short-duration gamma-ray bursts (GRBs) using data taken by the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND) from 2002 August to 2013 June. No statistically significant excess over the ...
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Journal ArticleThe Review of scientific instruments · May 2015
We present the design, description, calibration procedure, and an analysis of systematic effects for an apparatus designed to measure the rotation of the plane of polarization of a transversely polarized slow neutron beam as it passes through unpolarized m ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · January 1, 2015
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 developed to measure and efficiently extract radon decay products from liquid scinti ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · January 1, 2015
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 calibration. The device worked by paying out and reeling in precise lengths of a hangi ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · August 2, 2013
The recent long-term shutdown of Japanese nuclear reactors has resulted in a significantly reduced reactor ν̄e flux at KamLAND. This running condition provides a unique opportunity to confirm and constrain backgrounds for the reactor ν̄e oscillation analysis ...
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Journal ArticlePhysical review letters · February 2013
We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of (136)Xe. We obtain a lower limit for the neutrinoless double-beta decay half-life of T(1/2)(0ν)>1.9×10(25) yr at 90% C.L. ...
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Journal ArticlePhysical Review C - Nuclear Physics · August 6, 2012
We present limits on Majoron-emitting neutrinoless double-β decay modes based on an exposure of 112.3 days with 125 kg of 136Xe. In particular, a lower limit on the ordinary (spectral index n=1) Majoron-emitting decay half-life of 136Xe is obtained as T1/2 ...
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Journal ArticlePhysical Review C - Nuclear Physics · May 16, 2012
Cross-section measurements have been made at 16 and 19 MeV in two exit-channel configurations of neutron-deuteron breakup: the space star and coplanar star. In this kinematically complete measurement, the outgoing proton and one of the neutrons were detect ...
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Journal ArticlePhysical Review C - Nuclear Physics · April 19, 2012
We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of 136Xe. The measured two-neutrino double-beta decay half-life of 136Xe is T1/22ν=2.38±0.02(stat) ±0.14(syst)×1021 yr, consistent with a rec ...
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Journal ArticleAstrophysical Journal · February 1, 2012
We present the results of a search for extraterrestrial electron antineutrinos (?e's) in the energy range 8.3MeV < E?e < 31.8MeV using the KamLAND detector. In an exposure of 4.53 kton-year, we identify 25 candidate events. All of the candidate events can ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 11, 2012
A photofission experiment was performed on targets of 235U, 238U, 239Pu, and 232Th using nearly 100% linearly polarized, high-intensity (∼107 γ/s), and nearly monoenergetic γ-ray beams having energies between 5.6 and 7.3 MeV at the High Intensity γ-ray Sou ...
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ConferenceNuovo Cimento della Societa Italiana di Fisica C · January 1, 2012
The weak interaction between nucleons leads to parity violation in various reaction observables. Neutron spin rotation, the rotation of the plane of polarization of a transversely polarized neutron beam passing through unpolarized matter, is an especially ...
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Journal ArticlePhysical Review C - Nuclear Physics · September 13, 2011
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 recoil rate, above a 5.5-MeV analysis threshold is 1.49 ± 0.14(stat) ± 0.17(sys ...
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Journal ArticleNature Geoscience · September 1, 2011
The Earth has cooled since its formation, yet the decay of radiogenic isotopes, and in particular uranium, thorium and potassium, in the planet's interior provides a continuing heat source. The current total heat flux from the Earth to space is 44.2± 1.0TW ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · March 4, 2011
We present new constraints on the neutrino oscillation parameters Δm212, θ12, and θ13 from a three-flavor analysis of solar and KamLAND data. The KamLAND data set includes data acquired following a radiopurity upgrade and amounts to a total exposure of 3.4 ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · March 1, 2011
Measurements of parity-violating neutron spin rotation can provide insight into the poorly understood nucleonnucleon weak interaction. Because the expected rotation angle per unit length is small (10-7 rad/m), several properties of the polarized cold neutr ...
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Journal ArticlePhysical Review C - Nuclear Physics · February 7, 2011
We report an upper bound on parity-violating neutron spin rotation in He4. This experiment is the most sensitive search for neutron-weak optical activity yet performed and represents a significant advance in precision in comparison to past measurements in ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · December 21, 2009
A liquid helium target system was designed and built to perform a precision measurement of the parity-violating neutron spin rotation in helium due to the nucleon-nucleon weak interaction. The measurement employed a beam of low energy neutrons that passed ...
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Journal ArticleJournal of Instrumentation · November 16, 2009
We have successfully built and operated a source deployment system for the KamLAND detector. This system was used to position radioactive sources throughout the delicate 1-kton liquid scintillator volume, while meeting stringent material cleanliness, mater ...
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Journal ArticlePhysical review letters · June 2008
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam21(2) and stringent constraints on theta12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44 x 10(32) ...
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ConferenceAIP Conference Proceedings · December 1, 2006
Weak interactions between u and d quarks induce weak interactions between nucleons. These weak-interaction effects can be isolated from strong interactions using parity-violation (PV). The nucleon-nucleon (NN) weak interaction amplitudes are constrained by ...
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Journal ArticlePhysical Review C - Nuclear Physics · March 23, 2006
We report relative measurements of the n→-d→ longitudinal spin-dependent total cross-section difference (ΔσL)d, at En(lab) = 5.0, 6.88, and 9.0 MeV. The deuteron target was polarized via dynamic nuclear polarization at 250 mK in a 2.5-T external magnetic f ...
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Journal ArticlePhysical review letters · March 2006
The Kamioka Liquid scintillator Anti-Neutrino Detector is used in a search for single neutron or two-neutron intranuclear disappearance that would produce holes in the -shell energy level of (12)C nuclei. Such holes could be created as a result of nucleon ...
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Journal ArticlePhysical review letters · March 2005
We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 nu (e) candidate events with energies above 3.4 MeV compared to 365.2+/-23.7 events expected in the absence of neutri ...
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ConferenceJournal of Research of the National Institute of Standards and Technology · January 1, 2005
In the meson exchange model of weak nucleon-nucleon (NN) interactions, the exchange of virtual mesons between the nucleons is parameterized by a set of weak meson exchange amplitudes. The strengths of these amplitudes from theoretical calculations are not ...
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Journal ArticleJournal of Research of the National Institute of Standards and Technology · January 1, 2005
We are developing a high-efficiency neutron detector with 1 cm position resolution and coarse energy resolution for use at high-flux neutron source facilities currently proposed or under construction. The detector concept integrates a segmented 3He ionizat ...
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ConferenceJournal of Research of the National Institute of Standards and Technology · January 1, 2005
Our understanding of hadronic parity violation is far from clear despite nearly 50 years of theoretical and experimental progress. Measurements of low-energy parity-violating observables in nuclear systems are the only accessible means to study the flavor- ...
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ConferenceJournal of Physics G: Nuclear and Particle Physics · August 1, 2003
KamLAND, a nuclear reactor v̄ detector, is uniquely situated and designed to be maximally sensitive to the large mixing angle parameters of the MSW theory of v oscillations. The KamLAND detector began to acquire data on 22 January 2002. This paper presents ...
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ConferenceJournal of Physics G: Nuclear and Particle Physics · August 1, 2003
By exploring the oscillation mixing angle versus mass difference allowed regions, terrestrial-based experiments have advanced our understanding of the v oscillation solutions proposed by the measurements of neutrinos produced in the sun and in the atmosphe ...
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Journal ArticleModern Physics Letters A · February 28, 2003
New results for the neutron-deuteron analyzing power Ay (θ) at En = 1.2 and 1.9 MeV and their comparison to proton-deuteron data reveal a sizeable and unexpected difference which increases with decreasing center-of-mass energy. This finding calls for the t ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · January 16, 2003
New results for the neutron-deuteron analyzing power Ay(θ) at En = 1.2 and 1.9 MeV and their comparison to proton-deuteron data reveal a sizeable and unexpected difference which increases with decreasing center-of-mass energy. This finding calls for the th ...
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Journal ArticleNuclear Physics B - Proceedings Supplements · January 1, 2002
The KamLAND experiment is a very long baseline reactor ̄ne oscillation experiment. This experiment has sensitivity to the oscillation parameters Δℳ2 > 10-5 eV2 and sin2θ > 0.2, using reactor ̄ne which come typically from 170km away. This sensitive region com ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · January 11, 2001
We developed a longitudinally and transversely segmented 3He ionization chamber that can simultaneously measure the energy spectrum and total flux of a cold neutron beam (Tn = 30 K, λn = 5.6 angstroms) in each of four transverse segments. The detector dire ...
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Journal ArticlePhysical Review C · January 1, 1995
We measured the He4(α,γ) cross section at θγ= 90°across the 16.6 and 16.9 MeV resonances in Be8 and obtained angular distributions on the peaks of both resonances. The decays of the 16 MeV doublet to the 3.0 MeV 2+ final state have an (isovector E2)/(isove ...
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Journal ArticlePhysical Review C · January 1, 1991
Wiescher, Görres, and Thielemann suggested that a "missing" J3 level in Ne18 should occur at Ex4.33 MeV, only 410 keV above the F17p threshold. They noted that this level would provide an s-wave resonance in the F17(p) reaction, greatly increasing its ther ...
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