H. Ejiri
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View article: Delta isobar resonance effects studied by summed isospin spin strengths and nuclear matrix elements for double and single beta decays
Delta isobar resonance effects studied by summed isospin spin strengths and nuclear matrix elements for double and single beta decays Open
Nuclear matrix elements (NMEs) for double and single beta decays are crucial for studying neutrino properties beyond and within the standard model. The NMEs consist mainly of the spin isospin components. The delta isobar resonance, which i…
View article: The MAJORANA DEMONSTRATOR experiment's construction, commissioning, and performance
The MAJORANA DEMONSTRATOR experiment's construction, commissioning, and performance Open
Background: The MAJORANA DEMONSTRATOR , a modular array of isotopically enriched high-purity germanium (HPGe) detectors, was constructed to demonstrate backgrounds low enough to justify building a tonne-scale experiment to search for the n…
View article: The Monument experiment: ordinary muon capture studies for $$0\nu \beta \beta $$ decay
The Monument experiment: ordinary muon capture studies for $$0\nu \beta \beta $$ decay Open
View article: Final Results of the MAJORANA DEMONSTRATOR's Search for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se
Final Results of the MAJORANA DEMONSTRATOR's Search for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se Open
$^{76}$Ge can $ββ$ decay into three possible excited states of $^{76}$Se, with the emission of two or, if the neutrino is Majorana, zero neutrinos. None of these six transitions have yet been observed. The MAJORANA DEMONSTRATOR was designe…
View article: Constraints on the Decay of Ta180m
Constraints on the Decay of Ta180m Open
180mTa is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known β and electron capture decays due to the large K-spin differences and small energy differences be…
View article: Neutrino Masses and Right-Handed Weak Currents Studied by Neutrino-Less ββ-Decay Detectors
Neutrino Masses and Right-Handed Weak Currents Studied by Neutrino-Less ββ-Decay Detectors Open
Detecting neutrino-less double beta (0νββ) decay with high-sensitivity 0νββ detectors is of current interest for studying the Majorana neutrino’s nature, the neutrino mass (ν-mass), right-handed weak currents (RHCs), and others beyond the …
View article: The MONUMENT Experiment: Ordinary Muon Capture studies for 0$νββ$ decay
The MONUMENT Experiment: Ordinary Muon Capture studies for 0$νββ$ decay Open
The MONUMENT experiment measures ordinary muon capture (OMC) on isotopes relevant for neutrinoless double-beta (0$νββ$) decay and nuclear astrophysics. OMC is a particularly attractive tool for improving the theoretical description of 0$νβ…
View article: Present status of PICOLON project
Present status of PICOLON project Open
The existence of cosmic dark matter and neutrino properties are long-standing problems in cosmology and particle physics. These problems have been investigated by using radiation detectors. We will discuss the application of inorganic crys…
View article: Radiopurity of NaI(Tl) crystals for PICOLON dark matter experiment
Radiopurity of NaI(Tl) crystals for PICOLON dark matter experiment Open
The dark matter observation claim by the DAMA/LIBRA collaboration has been a long-standing puzzle within the particle physics community. Efforts of other research groups to verify the claim have been insufficient by significant radioactivi…
View article: Erratum: Search for Spontaneous Radiation from Wave Function Collapse in the Majorana Demonstrator [Phys. Rev. Lett. <b>129</b>, 080401 (2022)]
Erratum: Search for Spontaneous Radiation from Wave Function Collapse in the Majorana Demonstrator [Phys. Rev. Lett. <b>129</b>, 080401 (2022)] Open
This corrects the article DOI: 10.1103/PhysRevLett.129.080401.
View article: Charge trapping correction and energy performance of the Majorana Demonstrator
Charge trapping correction and energy performance of the Majorana Demonstrator Open
P-type point contact (PPC) high-purity germanium detectors are an important technology in astroparticle and nuclear physics due to their superb energy resolution, low noise, and pulse shape discrimination capabilities. Analysis of data fro…
View article: Electromagnetic transitions from isobaric analogue states to study nuclear matrix elements for double beta decays and astro-neutrino inverse beta decays
Electromagnetic transitions from isobaric analogue states to study nuclear matrix elements for double beta decays and astro-neutrino inverse beta decays Open
Experimental studies for nuclear matrix elements (NMEs) for neutrinoless double beta decays (DBDs) and astro-neutrino inverse beta decays (IBDs) are crucial for neutrino studies beyond the standard model and the astro neutrino reactions si…
View article: Original e− Capture Cross Sections for Hot Stellar Interior Energies
Original e− Capture Cross Sections for Hot Stellar Interior Energies Open
The nuclear electron capture reaction possesses a prominent position among other weak interaction processes occurring in explosive nucleosynthesis, especially at the late stages of evolution of massive stars. In this work, we perform exclu…
View article: Single- and Double-Charge Exchange Reactions and Nuclear Matrix Element for Double-Beta Decay
Single- and Double-Charge Exchange Reactions and Nuclear Matrix Element for Double-Beta Decay Open
Neutrino properties such as the Majorana nature and the masses, which go beyond the standard model, are derived from the experimental double-beta decay (DBD) rate by using the DBD nuclear matrix element (NME). Theoretical evaluations for t…
View article: Search for Spontaneous Radiation from Wave Function Collapse in the Majorana Demonstrator
Search for Spontaneous Radiation from Wave Function Collapse in the Majorana Demonstrator Open
The Majorana Demonstrator neutrinoless double-beta decay experiment comprises a 44 kg (30 kg enriched in ^{76}Ge) array of p-type, point-contact germanium detectors. With its unprecedented energy resolution and ultralow backgrounds, Majora…
View article: Editorial: Neutrino Nuclear Responses for Astro-Particle Physics by Nuclear Reactions and Nuclear Decays
Editorial: Neutrino Nuclear Responses for Astro-Particle Physics by Nuclear Reactions and Nuclear Decays Open
EDITORIAL article Front. Astron. Space Sci., 31 May 2022Sec. High-Energy and Astroparticle Physics https://doi.org/10.3389/fspas.2022.836881
View article: Calculated Event Rates for Axion Detection via Atomic and Nuclear Processes
Calculated Event Rates for Axion Detection via Atomic and Nuclear Processes Open
The possibility of detection of 5.5 MeV and 14.4 keV solar axions by observing axion-induced nuclear and atomic transitions is investigated. The presence of nuclear transitions between spin orbit partners can be manifested by the subsequen…
View article: Nuclear matrix elements for neutrinoless <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math> decays and spin-dipole giant resonances
Nuclear matrix elements for neutrinoless decays and spin-dipole giant resonances Open
Nuclear matrix elements (NMEs) for neutrinoless double beta decays (DBDs) are\nrequired for studying neutrino physics beyond the standard model by DBD. The\nexperimental spin-dipole (SD) giant resonance energy and the SD strength are\nshow…
View article: PICOLON dark matter search project
PICOLON dark matter search project Open
PICOLON (Pure Inorganic Crystal Observatory for LOw-energy Neutr(al)ino) aims to search for cosmic dark matter by high purity NaI(Tl) scintillator. We developed extremely pure NaI(Tl) crystal by hybrid purification method. The recent resul…
View article: Characteristics of signals originating near the lithium-diffused N+ contact of high purity germanium p-type point contact detectors
Characteristics of signals originating near the lithium-diffused N+ contact of high purity germanium p-type point contact detectors Open
A study of signals originating near the lithium-diffused n+ contact of p-type point contact (PPC) high purity germanium detectors (HPGe) is presented. The transition region between the active germanium and the fully dead layer of the n+ co…
View article: Dark matter search with high purity NaI(Tl) scintillator
Dark matter search with high purity NaI(Tl) scintillator Open
A dark matter search project needs and extremely low background radiation detector since the expected event rate of dark matter is less than a few events in one year in one tonne of the detector mass. The authors developed a highly radiopu…
View article: Ordinary Muon Capture for Double Beta Decay and Anti-Neutrino Nuclear Responses
Ordinary Muon Capture for Double Beta Decay and Anti-Neutrino Nuclear Responses Open
This is a brief review on ordinary muon capture (OMC) experiments at Research Center for Nuclear Physics (RCNP) Osaka University relevant for the study of double beta decays (DBDs) and astro anti-neutrinos (neutrino) nuclear responses. OMC…
View article: Calculated event rates for Axion Detection via Atomic and Nuclear Processes
Calculated event rates for Axion Detection via Atomic and Nuclear Processes Open
The possibility of detection of 5.5 MeV and 14.4 keV solar axions by observing axion-induced nuclear and atomic transitions is investigated. The presence of nuclear transitions between spin-orbit partners can be manifested by the subsequen…
View article: Experimental Approaches to Neutrino Nuclear Responses for ββ Decays and Astro-Neutrinos
Experimental Approaches to Neutrino Nuclear Responses for ββ Decays and Astro-Neutrinos Open
Fundamental properties of neutrinos are investigated by studying double beta decays ( -decays), while atro-neutrino nucleo-syntheses and astro-neutrino productions are investigated by studying inverse beta decays (inverse β -decays) induc…
View article: Development of highly radiopure NaI(Tl) scintillator for PICOLON dark matter search project
Development of highly radiopure NaI(Tl) scintillator for PICOLON dark matter search project Open
Highly radiopure NaI(Tl) was developed to search for particle candidates of dark matter. Optimized methods were combined to reduce various radioactive impurities. $^{40}$K was effectively reduced by the recrystallization method. The progen…
View article: Nuclear and Detector Sensitivities for Neutrinoless Double Beta-Decay Experiments
Nuclear and Detector Sensitivities for Neutrinoless Double Beta-Decay Experiments Open
Neutrinoless double beta-decay (DBD) is of current interest in high-sensitivity frontiers of particle physics. The decay is very sensitive to Majorana neutrino masses, neutrino CP phases, right-handed weak interactions, and others, which a…
View article: ADC Nonlinearity Correction for the Majorana Demonstrator
ADC Nonlinearity Correction for the Majorana Demonstrator Open
Imperfections in analog-to-digital conversion cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for the MAJORANA DEMONSTRATOR 76Ge neutrinoless double beta…
View article: Nuclear and detector sensitivities for neutrinoless double beta-decay experiments
Nuclear and detector sensitivities for neutrinoless double beta-decay experiments Open
Neutrinoless double beta-decay(DBD) is of current interest in high-sensitivity frontiers of particle physics. The decay is very sensitive to Majorana neutrinos masses, neutrino CP phases, right-handed weak interactions and others, which ar…
View article: Neutrino-Mass Sensitivity and Nuclear Matrix Element for Neutrinoless Double Beta Decay
Neutrino-Mass Sensitivity and Nuclear Matrix Element for Neutrinoless Double Beta Decay Open
Neutrinoless double beta decay (DBD) is a useful probe to study neutrino properties such as the Majorana nature, the absolute neutrino mass, the CP phase and the others, which are beyond the standard model. The nuclear matrix element (NME)…
View article: Nuclear isotope production by ordinary muon capture reaction
Nuclear isotope production by ordinary muon capture reaction Open