B. R. Ko
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View article: Constraints on WIMP-like dark matter scattering on electrons with COSINE-100
Constraints on WIMP-like dark matter scattering on electrons with COSINE-100 Open
We present results of the search for WIMP-like dark matter interaction with electrons in the NaI(Tl) crystals of the COSINE-100 experiment. The two benchmark scenarios of a heavy and a light vector boson as mediator of the interaction were…
View article: Axion dark matter searches from the standard halo over the tidal stream to the big flow
Axion dark matter searches from the standard halo over the tidal stream to the big flow Open
A bstract The sensitivity of axion dark matter searches depends on the signal window that results from the velocity dispersion of axion dark matter. Since the ratio of signal windows is about 6500 between the standard halo and the big flow…
View article: Asymmetrical cavity design that bypasses mode mixings in axion haloscope experiments
Asymmetrical cavity design that bypasses mode mixings in axion haloscope experiments Open
Microwave cavities used in axion haloscope experiments typically employ a tuning rod as a means to widen the range of resonance frequencies at which it is sensitive to axion-to-photon conversion. A realistic tuning mechanism requires a gap…
View article: Axion dark matter searches from the standard halo over the tidal stream to the big flow
Axion dark matter searches from the standard halo over the tidal stream to the big flow Open
The sensitivity of axion dark matter searches depends on the signal window that results from the velocity dispersion of axion dark matter. Since the ratio of signal windows is about 6500 between the standard halo and the big flow axion dar…
View article: Evolution of two-neutrons configuration from 11Li to 13Li
Evolution of two-neutrons configuration from 11Li to 13Li Open
In this work we investigate the two-neutron decay of 13Li and of the excited states of 11Li populated via one-proton removal from 14Be and 12Be, respectively. A phenomenological model is used to describe the decay of 11Li and 13Li. While t…
View article: Extensive Search for Axion Dark Matter over 1 GHz with CAPP’S Main Axion Experiment
Extensive Search for Axion Dark Matter over 1 GHz with CAPP’S Main Axion Experiment Open
We report an extensive high-sensitivity search for axion dark matter above 1 GHz at the Center for Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting the coupling between axions and photons, explored the fr…
View article: Enhanced tunable cavity development for axion dark matter searches using a piezoelectric motor in combination with gears
Enhanced tunable cavity development for axion dark matter searches using a piezoelectric motor in combination with gears Open
Most search experiments sensitive to quantum chromodynamics (QCD) axion dark matter benefit from microwave cavities, as electromagnetic resonators, that enhance the detectable axion signal power and thus the experimental sensitivity drasti…
View article: Enhanced tunable cavity development for axion dark matter searches using a piezoelectric motor in combination with gears
Enhanced tunable cavity development for axion dark matter searches using a piezoelectric motor in combination with gears Open
Most search experiments sensitive to quantum chromodynamics (QCD) axion dark matter benefit from microwave cavities, as electromagnetic resonators, that enhance the detectable axion signal power and thus the experimental sensitivity drasti…
View article: Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment
Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment Open
We report an extensive high-sensitivity search for axion dark matter above 1\,GHz at the Center for Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting the coupling between axions and photons, explored the f…
View article: Search for the Sagittarius tidal stream of axion dark matter around 4.55 µeV
Search for the Sagittarius tidal stream of axion dark matter around 4.55 µeV Open
We report the first search for the Sagittarius tidal stream of axion dark matter around 4.55 $\\mu$eV using CAPP-12TB haloscope data acquired in March of 2022. Our result excluded the Sagittarius tidal stream of Dine-Fischler-Srednicki-Zhi…
View article: Mass, spectroscopy and two-neutron decay of $^{16}$Be
Mass, spectroscopy and two-neutron decay of $^{16}$Be Open
The structure and decay of the most neutron-rich beryllium isotope, $^{16}$Be, has been investigated following proton knockout from a high-energy $^{17}$B beam. Two relatively narrow resonances were observed for the first time, with energi…
View article: Search for the Sagittarius tidal stream of axion dark matter around 4.55 $μ$eV
Search for the Sagittarius tidal stream of axion dark matter around 4.55 $μ$eV Open
We report the first search for the Sagittarius tidal stream of axion dark matter around 4.55 $μ$eV using CAPP-12TB haloscope data acquired in March of 2022. Our result excluded the Sagittarius tidal stream of Dine-Fischler-Srednicki-Zhitni…
View article: Analytical estimation of the signal to noise ratio efficiency in axion dark matter searches using a Savitzky-Golay filter
Analytical estimation of the signal to noise ratio efficiency in axion dark matter searches using a Savitzky-Golay filter Open
The signal to noise ratio efficiency $ε_{\rm SNR}$ in axion dark matter searches has been estimated using large-statistic simulation data reflecting the background information and the expected axion signal power obtained from a real experi…
View article: Online support for research activities by high school and junior high school students
Online support for research activities by high school and junior high school students Open
Accel Kitchen LLC has launched Japan largest cosmic-ray outreach network providing handy cosmic-ray detectors to more than 100 high school and junior high school students and supporting their research activities remotely with online commun…
View article: Searching for universality of dineutron correlation at the surface of Borromean nuclei
Searching for universality of dineutron correlation at the surface of Borromean nuclei Open
The dineutron correlation is systematically studied in three different Borromean nuclei near the neutron dripline, 11Li, 14Be and 17B, via the (p, pn) knockout reaction measured at the RIBF facility in RIKEN. For the three nuclei, the corr…
View article: A Safer, Smaller, Cleaner Subcritical Thorium Fission—Muonic Fusion Hybrid Reactor
A Safer, Smaller, Cleaner Subcritical Thorium Fission—Muonic Fusion Hybrid Reactor Open
Until the pure fusion ages come true, present nuclear power is a crucial option if humanity takes aim for a zero net carbon society by the 2050s. A thorium subcritical reactor activated and controlled by muon-catalyzed fusion (MuCF) is an …
View article: Evaluations of uncertainties in simulations of propagation of ultrahigh-energy cosmic-ray nuclei derived from microscopic nuclear models
Evaluations of uncertainties in simulations of propagation of ultrahigh-energy cosmic-ray nuclei derived from microscopic nuclear models Open
Photodisintegration is a main energy loss process for ultrahigh-energy cosmic-ray (UHECR) nuclei in intergalactic space. Therefore, it is crucial to understand systematic uncertainty in photodisintegration when simulating the propagation o…
View article: Searching for universality of dineutron correlation at the surface of Borromean nuclei
Searching for universality of dineutron correlation at the surface of Borromean nuclei Open
The dineutron correlation is systematically studied in three different\nBorromean nuclei near the neutron dripline, 11Li, 14Be and 17B, via the (p, pn)\nknockout reaction measured at the RIBF facility in RIKEN. For the three nuclei,\nthe c…
View article: Search for the Sagittarius Tidal Stream of Axion Dark Matter around 4.55 $μ$eV
Search for the Sagittarius Tidal Stream of Axion Dark Matter around 4.55 $μ$eV Open
We report the first search for the Sagittarius tidal stream of axion dark matter around 4.55 $μ$eV using CAPP-12TB haloscope data acquired in March of 2022. Our result excluded the Sagittarius tidal stream of Dine-Fischler-Srednicki-Zhitni…
View article: Axion Dark Matter Search around 4.55 $μ$eV with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity
Axion Dark Matter Search around 4.55 $μ$eV with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity Open
We report an axion dark matter search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, assuming axions contribute 100\% of the local dark matter density. The search excluded the axion--photon coupling $g_{aγ…
View article: Fast DAQ system with image rejection for axion dark matter searches
Fast DAQ system with image rejection for axion dark matter searches Open
A fast data acquisition (DAQ) system for axion dark matter searches utilizing a microwave resonant cavity, also known as axion haloscope searches, has been developed with a two-channel digitizer that can sample 16-bit amplitudes at rates u…
View article: Erratum to: Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
Erratum to: Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector Open
One correction is noted for the paper. The branching fraction (Formula presented.) was not included in the conversion of the observed cross-section limit, (Formula presented.) to the coupling constants κugt and κcgt and the branching fract…
View article: Performance of a triple-GEM demonstrator in pp collisions at the CMS detector
Performance of a triple-GEM demonstrator in pp collisions at the CMS detector Open
After the Phase-2 high-luminosity upgrade to the Large Hadron Collider (LHC), the collision rate and therefore the background rate will significantly increase, particularly in the high η region. To improve both the tracking and triggering …
View article: Development of an FPGA-based realtime DAQ system for axion haloscope experiments
Development of an FPGA-based realtime DAQ system for axion haloscope experiments Open
A real-time Data Acquisition (DAQ) system for the CULTASK axion haloscope experiment was constructed and tested. The CULTASK is an experiment to search for cosmic axions using resonant cavities, to detect photons from axion conversion thro…