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Tuning Wave-Particle Duality of Quantum Light by Generalized Photon Subtraction
Authors:
Kan Takase,
Mamoru Endo,
Fumiya Hanamura,
Kazuki Hirota,
Masahiro Yabuno,
Hirotaka Terai,
Shigehito Miki,
Takahiro Kashiwazaki,
Asuka Inoue,
Takeshi Umeki,
Petr Marek,
Radim Filip,
Warit Asavanant,
Akira Furusawa
Abstract:
Wave--particle duality is a hallmark of quantum mechanics. For bosonic systems, there exists a continuum of intermediate states bridging wave-like Schrödinger cat states and particle-like Fock states. Such states have recently been recognized as valuable resources for enhancing fault-tolerant quantum computation (FTQC) with propagating light. Here we experimentally demonstrate tunable generation o…
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Wave--particle duality is a hallmark of quantum mechanics. For bosonic systems, there exists a continuum of intermediate states bridging wave-like Schrödinger cat states and particle-like Fock states. Such states have recently been recognized as valuable resources for enhancing fault-tolerant quantum computation (FTQC) with propagating light. Here we experimentally demonstrate tunable generation of these intermediate states by employing generalized photon subtraction (GPS). By detecting up to three photons from squeezed-light sources with a photon-number-resolving detector, we continuously control the balance between wave- and particle-like features. This approach allows us to construct a spectral family of quantum states with high generation rates, optimized according to the required fault-tolerance threshold. Our results establish GPS as a versatile toolbox for tailoring non-Gaussian resources, opening a pathway to efficient Gottesman--Kitaev--Preskill (GKP) qubit generation and addressing a central bottleneck in optical quantum computing.
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Submitted 25 February, 2026;
originally announced February 2026.
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Ultrashort-pulse-pumped, single-mode type-0 squeezers in lithium niobate nanophotonics
Authors:
Martin Houde,
Liam Beaudoin,
Robert Kwolek,
Kazuki Hirota,
Rajveer Nehra,
Nicolás Quesada
Abstract:
We present design principles for ultrashort-pulse, type-0 phase-matched optical parametric amplifiers to generate and measure spectrally pure degenerate squeezed light. We consider a fundamental signal (second-harmonic) mode at 2090 (1045) nm and show that our proposed design achieves a Schmidt number of $K \approx 1.02$ with squeezing levels greater than 15 dB on a single temporal mode spanning o…
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We present design principles for ultrashort-pulse, type-0 phase-matched optical parametric amplifiers to generate and measure spectrally pure degenerate squeezed light. We consider a fundamental signal (second-harmonic) mode at 2090 (1045) nm and show that our proposed design achieves a Schmidt number of $K \approx 1.02$ with squeezing levels greater than 15 dB on a single temporal mode spanning over $5$ THz in bandwidth with cm-scale devices on thin-film lithium niobate (TFLN) on insulator platform. Our work opens up promising avenues for large-scale circuits for ultrafast quantum information processing and quantum sensing applications on the rapidly advancing TFLN platform with already demonstrated linear components and photodetection capabilities.
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Submitted 2 December, 2025; v1 submitted 23 December, 2024;
originally announced December 2024.
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Study on the reusability of fluorescent nuclear track detectors using optical bleaching
Authors:
Abdul Muneem,
Junya Yoshida,
Hiroyuki Ekawa,
Masahiro Hino,
Katsuya Hirota,
Go Ichikawa,
Ayumi Kasagi,
Masaaki Kitaguchi,
Satoshi Kodaira,
Kenji Mishima,
Jameel-Un Nabi,
Manami Nakagawa,
Michio Sakashita,
Norihito Saito,
Takehiko R. Saito,
Satoshi Wada,
Nakahiro Yasuda
Abstract:
Fluorescent nuclear track detectors (FNTDs) based on Al${_2}$O${_3}$:C,Mg crystals are luminescent detectors that can be used for dosimetry and detection of charged particles and neutrons. These detectors can be utilised for imaging applications where a reasonably high track density, approximately of the order of 1 $\times$ $10^4$ tracks in an area of 100 $\times$ 100 $μ$m$^2$, is required. To inv…
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Fluorescent nuclear track detectors (FNTDs) based on Al${_2}$O${_3}$:C,Mg crystals are luminescent detectors that can be used for dosimetry and detection of charged particles and neutrons. These detectors can be utilised for imaging applications where a reasonably high track density, approximately of the order of 1 $\times$ $10^4$ tracks in an area of 100 $\times$ 100 $μ$m$^2$, is required. To investigate the reusability of FNTDs for imaging applications, we present an approach to perform optical bleaching under the required track density conditions. The reusability was assessed through seven irradiation-bleaching cycles. For the irradiation, the studied FNTD was exposed to alpha-particles from an $^{241}$Am radioactive source. The optical bleaching was performed by means of ultraviolet laser light with a wavelength of 355 nm. Three dedicated regions on a single FNTD with different accumulated track densities and bleaching conditions were investigated. After every irradiation-bleaching cycle, signal-to-noise ratio was calculated to evaluate FNTD performance. It is concluded that FNTDs can be reused at least seven times for applications where accumulation of a high track density is required.
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Submitted 3 November, 2022;
originally announced November 2022.
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Investigation of the neutron imaging applications using fine-grained nuclear emulsion
Authors:
Abdul Muneem,
Junya Yoshida,
Hiroyuki Ekawa,
Masahiro Hino,
Katsuya Hirota,
Go Ichikawa,
Ayumi Kasagi,
Masaaki Kitaguchi,
Naoto Muto,
Kenji Mishima,
Jameel-Un Nabi,
Manami Nakagawa,
Naotaka Naganawa,
Takehiko R. Saito
Abstract:
Neutron imaging is a non-destructive inspection technique with a wide range of applications. One of the important aspects concerning neutron imaging is achieving micrometer-scale spatial resolution. Developing a neutron detector with a high resolution is a challenging task. Neutron detectors, based on fine-grained nuclear emulsion, may be suitable for high resolution neutron imaging applications.…
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Neutron imaging is a non-destructive inspection technique with a wide range of applications. One of the important aspects concerning neutron imaging is achieving micrometer-scale spatial resolution. Developing a neutron detector with a high resolution is a challenging task. Neutron detectors, based on fine-grained nuclear emulsion, may be suitable for high resolution neutron imaging applications. High track density is a necessary requirement to improve the quality of neutron imaging. However, the available track analysis methods are difficult to apply under high track density conditions. Simulated images were used to determine the required track density for neutron imaging. It was concluded that a track density of the order of $10^4$ tracks per 100 $\times$ 100 $μ$m$^2$ is sufficient to utilize neutron detectors for imaging applications. The contrast resolution was also investigated for the image data sets with various track densities and neutron transmission rates. Moreover, experiments were performed for neutron imaging of the gadolinium-based gratings with known geometries. The structure of gratings was successfully resolved. The calculated 1$σ$ 10-90 \% edge response, using the gray scale optical images of the grating slit with a periodic structure of 9 $μ$m, was 0.945 $\pm$ 0.004 $μ$m.
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Submitted 6 December, 2022; v1 submitted 30 October, 2022;
originally announced October 2022.
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A Novel Nuclear Emulsion Detector for Measurement of Quantum States of Ultracold Neutrons in the Earth's Gravitational Field
Authors:
Naoto Muto,
Hartmut Abele,
Tomoko Ariga,
Joachim Bosina,
Masahiro Hino,
Katsuya Hirota,
Go Ichikawa,
Tobias Jenke,
Hiroaki Kawahara,
Shinsuke Kawasaki,
Masaaki Kitaguchi,
Jakob Micko,
Kenji Mishima,
Naotaka Naganawa,
Mitsuhiro Nakamura,
Stéphanie Roccia,
Osamu Sato,
René I. P. Sedmik,
Yoshichika Seki,
Hirohiko M. Shimizu,
Satomi Tada,
Atsuhiro Umemoto
Abstract:
Hypothetical short-range interactions could be detected by measuring the wavefunctions of ultracold neutrons (UCNs) on a mirror bounded by the Earth's gravitational field. The Searches require detectors with higher spatial resolution. We are developing a UCN detector for the with a high spatial resolution, which consists of a Si substrate, a thin converter layer including $^{10}$B$_{4}$C, and a la…
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Hypothetical short-range interactions could be detected by measuring the wavefunctions of ultracold neutrons (UCNs) on a mirror bounded by the Earth's gravitational field. The Searches require detectors with higher spatial resolution. We are developing a UCN detector for the with a high spatial resolution, which consists of a Si substrate, a thin converter layer including $^{10}$B$_{4}$C, and a layer of fine-grained nuclear emulsion. Its resolution was estimated to be less than 100 nm by fitting tracks of either $^{7}$Li nuclei or $α$-particles, which were created when neutrons interacted with the $^{10}$B$_{4}$C layer. For actual measurements of the spatial distributions, the following two improvements were made: The first was to establish a method to align microscopic images with high accuracy within a wide region of 65 mm $\times$ 0.2 mm. We created reference marks of 1 $μ$m and 5 $μ$m diameter with an interval of 50 $μ$m and 500 $μ$m, respectively, on the Si substrate by electron beam lithography and realized a position accuracy of less than 30 nm. The second was to build a holder that could maintain the atmospheric pressure around the nuclear emulsion to utilize it under vacuum during exposure to UCNs. The intrinsic resolution of the improved detector was estimated by evaluating the blur of a transmission image of a gadolinium grating taken by cold neutrons as better than 0.56 $\pm$ 0.08 $μ$m, which included the grating accuracy. A test exposure to UCNs was conducted to obtain the spatial distribution of UCNs in the Earth's gravitational field. Although the test was successful, a blurring of 6.9 $μ$m was found in the measurements, compared with a theoretical curve. We identified the blurring caused by the refraction of UCNs due to the roughness of the upstream surface of the substrate. Polishing of the surface makes the resolution less than 100 nm.
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Submitted 26 May, 2022; v1 submitted 12 January, 2022;
originally announced January 2022.
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Development and application of a $^3$He Neutron Spin Filter at J-PARC
Authors:
T. Okudaira,
T. Oku,
T. Ino,
H. Hayashida,
H. Kira,
K. Sakai,
K. Hiroi,
S. Takahashi,
K. Aizawa,
H. Endo,
S. Endo,
M. Hino,
K. Hirota,
T. Honda,
K. Ikeda,
K. Kakurai,
W. Kambara,
M. Kitaguchi,
T. Oda,
H. Ohshita,
T. Otomo,
H. M. Shimizu,
T. Shinohara,
J. Suzuki,
T. Yamamoto
Abstract:
We are developing a neutron polarizer with polarized $^3$He gas, referred to as a $^3$He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A $^3$He gas-filling station was constructed at J-PARC, and several $^3$He cells with long…
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We are developing a neutron polarizer with polarized $^3$He gas, referred to as a $^3$He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A $^3$He gas-filling station was constructed at J-PARC, and several $^3$He cells with long spin relaxation times have been fabricated using the gas-filling station. A laboratory has been prepared in the MLF beam hall for polarizing $^3$He cells, and compact pumping systems with laser powers of 30~W and 110~W, which can be installed onto a neutron beamline, have been developed. A $^3$He polarization of 85% was achieved at a neutron beamline by using the pumping system with the 110~W laser. Recently, the first user experiment utilizing the $^3$He spin filter was conducted, and there have been several more since then. The development and utilization of $^3$He spin filters at MLF of J-PARC are reported.
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Submitted 29 May, 2020;
originally announced May 2020.
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Transverse asymmetry of $γ$ rays from neutron-induced compound states of ${}^{140}{\rm La}$
Authors:
T. Yamamoto,
T. Okudaira,
S. Endo,
H. Fujioka,
K. Hirota,
T. Ino,
K. Ishizaki,
A. Kimura,
M. Kitaguchi,
J. Koga,
S. Makise,
Y. Niinomi,
T. Oku,
K. Sakai,
T. Shima,
H. M. Shimizu,
S. Takada,
Y. Tani,
H. Yoshikawa,
T. Yoshioka
Abstract:
A correlation term ${{ σ}_{n} }\cdot ({ k_{n}\times k_γ}) $ in the ${}^{139}{\rm La}(\vec{n},γ)$ reaction has been studied utilizing epithermal polarized neutrons and germanium detectors. The transverse asymmetry for single $γ$-ray transition was measured to be $0.60\pm0.19$ in the $p$-wave resonance.
A correlation term ${{ σ}_{n} }\cdot ({ k_{n}\times k_γ}) $ in the ${}^{139}{\rm La}(\vec{n},γ)$ reaction has been studied utilizing epithermal polarized neutrons and germanium detectors. The transverse asymmetry for single $γ$-ray transition was measured to be $0.60\pm0.19$ in the $p$-wave resonance.
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Submitted 20 February, 2020;
originally announced February 2020.
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Improved determination of thermal cross section of 14N(n,p)14C for the neutron lifetime measurement
Authors:
R. Kitahara,
K. Hirota,
S. Ieki,
T. Ino,
Y. Iwashita,
M. Kitaguchi,
J. Koga,
K. Mishima,
A. Morishita,
N. Nagakura,
H. Oide,
H. Otono,
Y. Seki,
D. Sekiba,
T. Shima,
H. M. Shimizu,
N. Sumi,
H. Sumino,
K. Taketani,
T. Tomita,
T. Yamada,
S. Yamashita,
M. Yokohashi,
T. Yoshioka
Abstract:
In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated by the neutron decay rate and the incident neutron flux. The flux is obtained due to counting the protons emitted from the neutron absorption reaction of ${}^{3}{\rm He}$ gas, which is diluted in a mixture of working gas in a detector. Hence, it is crucial to determine the amount of…
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In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated by the neutron decay rate and the incident neutron flux. The flux is obtained due to counting the protons emitted from the neutron absorption reaction of ${}^{3}{\rm He}$ gas, which is diluted in a mixture of working gas in a detector. Hence, it is crucial to determine the amount of ${}^{3}{\rm He}$ in the mixture. In order to improve the accuracy of the number density of the ${}^{3}{\rm He}$ nuclei, we suggested to use the ${}^{14}{\rm N}({\rm n},{\rm p}){}^{14}{\rm C}$ reaction as a reference because this reaction involves similar kinetic energy as the ${}^{3}{\rm He}({\rm n},{\rm p}){}^{3}{\rm H}$ reaction and a smaller reaction cross section to introduce reasonable large partial pressure. The uncertainty of the recommended value of the cross section, however, is not satisfied with our requirement.
In this paper, we report the most accurate experimental value of the cross section of the ${}^{14}{\rm N}({\rm n},{\rm p}){}^{14}{\rm C}$ reaction at a neutron velocity of 2200 m/s, measured relative to the ${}^{3}{\rm He}({\rm n},{\rm p}){}^{3}{\rm H}$ reaction. The result was 1.868 $\pm$ 0.003 (stat.) $\pm$ 0.006 (sys.) b. Additionally, the cross section of the ${}^{17}{\rm O}({\rm n},{\rm α}){}^{14}{\rm C}$ reaction at the neutron velocity is also redetermined as 249 $\pm$ 6 mb.
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Submitted 2 August, 2019; v1 submitted 26 April, 2019;
originally announced April 2019.
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A Cold/Ultracold Neutron Detector using Fine-grained Nuclear Emulsion with Spatial Resolution less than 100 nm
Authors:
N. Naganawa,
T. Ariga,
S. Awano,
M. Hino,
K. Hirota,
H. Kawahara,
M. Kitaguchi,
K. Mishima,
H. M. Shimizu,
S. Tada,
S. Tasaki,
A. Umemoto
Abstract:
A new type of cold/ultracold neutron detector that can realize a spatial resolution of less than 100 nm was developed using nuclear emulsion. The detector consists of a fine-grained nuclear emulsion coating and a 50-nm thick $^{10}$B$_4$C layer for the neutron conversion. The detector was exposed to cold and ultracold neutrons (UCNs) at the J-PARC. Detection efficiencies were measured as (0.16…
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A new type of cold/ultracold neutron detector that can realize a spatial resolution of less than 100 nm was developed using nuclear emulsion. The detector consists of a fine-grained nuclear emulsion coating and a 50-nm thick $^{10}$B$_4$C layer for the neutron conversion. The detector was exposed to cold and ultracold neutrons (UCNs) at the J-PARC. Detection efficiencies were measured as (0.16$\pm$0.02)% and (12$\pm$2)% for cold and ultracold neutrons consistently with the $^{10}$B content in the converter. Positions of individual neutrons can be determined by observing secondary particle tracks recorded in the nuclear emulsion. The spatial resolution of incident neutrons were found to be in the range of 11-99 nm in the angle region of tan$θ\leq 1.9$, where $θ$ is the angle between a recorded track and the normal direction of the converter layer. The achieved spatial resolution corresponds to the improvement of one or two orders of magnitude compared with conventional techniques and it is comparable with the wavelength of UCNs.
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Submitted 1 March, 2018;
originally announced March 2018.
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Fundamental physics activities with pulsed neutron at J-PARC(BL05)
Authors:
Kenji Mishima,
Shogo Awano,
Yasuhiro Fuwa,
Fumiya Goto,
Christopher C. Haddock,
Masahiro Hino,
Masanori Hirose,
Katsuya Hirota,
Sei Ieki,
Sohei Imajo,
Takashi Ino,
Yoshihisa Iwashita,
Ryo Katayama,
Hiroaki Kawahara,
Masaaki Kitaguchi,
Ryunosuke Kitahara,
Jun Koga,
Aya Morishita,
Tomofumi Nagae,
Naoki Nagakura,
Naotaka Naganawa,
Noriko Oi,
Hideyuki Oide,
Hidetoshi Otono,
Yoshichika Seki
, et al. (15 additional authors not shown)
Abstract:
"Neutron Optics and Physics (NOP/ BL05)" at MLF in J-PARC is a beamline for studies of fundamental physics. The beamline is divided into three branches so that different experiments can be performed in parallel. These beam branches are being used to develop a variety of new projects. We are developing an experimental project to measure the neutron lifetime with total uncertainty of 1 s (0.1%). The…
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"Neutron Optics and Physics (NOP/ BL05)" at MLF in J-PARC is a beamline for studies of fundamental physics. The beamline is divided into three branches so that different experiments can be performed in parallel. These beam branches are being used to develop a variety of new projects. We are developing an experimental project to measure the neutron lifetime with total uncertainty of 1 s (0.1%). The neutron lifetime is an important parameter in elementary particle and astrophysics. Thus far, the neutron lifetime has been measured by several groups; however, different values are obtained from different measurement methods. This experiment is using a method with different sources of systematic uncertainty than measurements conducted to date. We are also developing a source of pulsed ultra-cold neutrons (UCNs) produced from a Doppler shifter are available at the unpolarized beam branch. We are developing a time focusing device for UCNs, a so called "rebuncher", which can increase UCN density from a pulsed UCN source. At the low divergence beam branch, an experiment to search an unknown intermediate force with nanometer range is performed by measuring the angular dependence of neutron scattering by noble gases. Finally the beamline is also used for the research and development of optical elements and detectors. For example, a position sensitive neutron detector that uses emulsion to achieve sub-micrometer resolution is currently under development. We have succeeded in detecting cold and ultra-cold neutrons using the emulsion detector.
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Submitted 25 January, 2018; v1 submitted 18 December, 2017;
originally announced December 2017.
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A Search for deviations from the inverse square law of gravity at nm range using a pulsed neutron beam
Authors:
Christopher C. Haddock,
Noriko Oi,
Katsuya Hirota,
Takashi Ino,
Masaaki Kitaguchi,
Satoru Matsumoto,
Kenji Mishima,
Tatsushi Shima,
Hirohiko M. Shimizu,
W. Michael Snow,
Tamaki Yoshioka
Abstract:
We describe an experimental search for deviations from the inverse square law of gravity at the nanometer length scale using neutron scattering from noble gases on a pulsed slow neutron beamline. By measuring the neutron momentum transfer ($q$) dependence of the differential cross section for xenon and helium and comparing to their well-known analytical forms, we place an upper bound on the streng…
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We describe an experimental search for deviations from the inverse square law of gravity at the nanometer length scale using neutron scattering from noble gases on a pulsed slow neutron beamline. By measuring the neutron momentum transfer ($q$) dependence of the differential cross section for xenon and helium and comparing to their well-known analytical forms, we place an upper bound on the strength of a new interaction as a function of interaction length $λ$ which improves upon previous results in the region $λ< 0.1\,$nm, and remains competitive in the larger $λ$ region. A pseudoexperimental simulation developed for this experiment and its role in the data analysis described. We conclude with plans for improving sensitivity in the larger $λ$ region.
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Submitted 21 February, 2018; v1 submitted 8 December, 2017;
originally announced December 2017.
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Characterization of Germanium Detectors for the Measurement of the Angular Distribution of Prompt gamma-rays at the ANNRI in the MLF of the J-PARC
Authors:
Shusuke Takada,
Takuya Okudaira,
Fumiya Goto,
Katsuya Hirota,
Atsushi Kimura,
Masaaki Kitaguchi,
Jun Koga,
Taro Nakao,
Kenji Sakai,
Hirohiko M. Shimizu,
Tomoki Yamamoto,
Tamaki Yoshioka
Abstract:
In this study, the germanium detector assembly, installed at the Accurate Neutron-Nuclear Reaction measurement Instruments (ANNRI) in the Material and Life Science Facility (MLF) operated by the Japan Proton Accelerator Research Complex (J-PARC), has been characterized for extension to the measurement of the angular distribution of individual gamma-ray transitions from neutron-induced compound sta…
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In this study, the germanium detector assembly, installed at the Accurate Neutron-Nuclear Reaction measurement Instruments (ANNRI) in the Material and Life Science Facility (MLF) operated by the Japan Proton Accelerator Research Complex (J-PARC), has been characterized for extension to the measurement of the angular distribution of individual gamma-ray transitions from neutron-induced compound states. We have developed a Monte Carlo simulation code using the GEANT4 toolkit, which can reproduce the pulse-height spectra of gamma-rays from radioactive sources and (n,gamma) reactions. The simulation is applicable to the measurement of gamma-rays in the energy region of 0.5-11.0 MeV.
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Submitted 7 December, 2017;
originally announced December 2017.
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Precise neutron lifetime experiment using pulsed neutron beams at J-PARC
Authors:
Naoki Nagakura,
Katsuya Hirota,
Sei Ieki,
Takashi Ino,
Yoshihisa Iwashita,
Masaaki Kitaguchi,
Ryunosuke Kitahara,
Kenji Mishima,
Aya Morishita,
Hideyuki Oide,
Hidetoshi Otono,
Risa Sakakibara,
Yoshichika Seki,
Tatsushi Shima,
Hirohiko M. Shimizu,
Tomoaki Sugino,
Naoyuki Sumi,
Hiroshima Sumino,
Kaoru Taketani,
Genki Tanaka,
Tatsuhiko Tomita,
Takahito Yamada,
Satoru Yamashita,
Mami Yokohashi,
Tamaki Yoshioka
Abstract:
The neutron lifetime is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure the lifetime with the goal precision of 0.1% at the polarized beam branch BL05 of MLF, J-PARC. The commissioning data was acquired in 2014 and 2015, and the first set of data to evaluate the lifetime in…
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The neutron lifetime is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure the lifetime with the goal precision of 0.1% at the polarized beam branch BL05 of MLF, J-PARC. The commissioning data was acquired in 2014 and 2015, and the first set of data to evaluate the lifetime in 2016, which is expected to yield a statistical uncertainty of O(1)%. This paper presents the current analysis results and the future plans to achieve our goal precision.
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Submitted 10 February, 2017;
originally announced February 2017.
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A neutron detector with spatial resolution of submicron using fine-grained nuclear emulsion
Authors:
N. Naganawa,
S. Awano,
M. Hino,
M. Hirose,
K. Hirota,
H. Kawahara,
M. Kitaguchi,
K. Mishima,
T. Nagae,
H. M. Shimizu,
S. Tasaki,
A. Umemoto
Abstract:
We have been developing a neutron detector with spatial resolution of submicron by loading 6Li into fine-grained nuclear emulsion. By exposure to thermal neutrons, tracks from neutron capture events were observed. From their grain density, spatial resolution was estimated. Detection efficiency was also measured by an experiment with cold neutrons.
We have been developing a neutron detector with spatial resolution of submicron by loading 6Li into fine-grained nuclear emulsion. By exposure to thermal neutrons, tracks from neutron capture events were observed. From their grain density, spatial resolution was estimated. Detection efficiency was also measured by an experiment with cold neutrons.
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Submitted 14 December, 2016;
originally announced December 2016.