In this study,we calculated the inclusive charged-current neutrino-nucleus scattering from ^(40)Ar in the quasielastic region.To explore the effect of uncertainties stemming from the nuclear structure,we used the KIDS...In this study,we calculated the inclusive charged-current neutrino-nucleus scattering from ^(40)Ar in the quasielastic region.To explore the effect of uncertainties stemming from the nuclear structure,we used the KIDS(Korea-IBS-Daegu-SKKU)nuclear energy density functional and Skyrme force models,namely SLy4,SkI3,and MSk7.These models were selected to have distinct behavior in terms of the density dependence of the symmetry energy and the effective mass of the nucleon.In the charged-current neutrino scattering,the single-and double-differential cross sections were calculated for various kinematics.Total cross sections are reported as a function of the incident neutrino energy.The theoretical cross sections were compared with experimental data,and the roles of the effective mass and symmetry energy were investigated in terms of charged-current neutrino-nucleus scattering.展开更多
The effects of ion screening in stellar core collapses are investigated based on a new progenitor star model. Simulation results show that ion screening slightly affects the leptons and decreases explosion energy, whi...The effects of ion screening in stellar core collapses are investigated based on a new progenitor star model. Simulation results show that ion screening slightly affects the leptons and decreases explosion energy, which is a negative factor for energy transfer supernova explosions. We also investigate the effect on type Ⅱ-supernova explosions of neutrino-nucleus elastic scattering based on the new progenitor star model. It is shown that, compared with the previously calculated results, neutrinos-nucleus elastic scattering in stellar core collapses is more severe, leading to an obvious reduction of the neutrino leakage energy loss and an increase of supernova explosion energy.展开更多
Background We propose to measure the coherent elastic neutrino-nucleus scattering(CEvNS)using a dual-phase liquid argon time projection chamber(TPC)with 200 kg fiducial mass.The detector is expected to be adjacent to ...Background We propose to measure the coherent elastic neutrino-nucleus scattering(CEvNS)using a dual-phase liquid argon time projection chamber(TPC)with 200 kg fiducial mass.The detector is expected to be adjacent to the JUNOTAO experiment and to be about 35 m from a reactor core with 4.6 GW thermal power at Taishan.The antineutrino flux is approximately 6×10^(12)cm^(−1)s^(−1) at this location,leading to more than 11,000 coherent scattering events per day in the fiducial mass.Motivation The nuclear recoil energies concentrate in the sub-keV region,corresponding to less than ten ionization electrons in the liquid argon.The key question is how to veto and shield the background in the hall where the vertical overburden is about 5 m.w.e.And what is the signal count rate and the background rate.In addition,what physical parameters can be measured what is the sensitivity.Methods We used the Geant4 to simulate the backgrounds from cosmic ray muons and ambient radioactivity decays.And a veto and shielding design is presented.Then a χ^(2) function is constructed and the sensitivity calculate package built to calculate the sensitivity of physical parameters.Results The detection of several ionization electrons can be achieved in the dual-phase TPC due to the large amplification in the gas region.With a feasible detection threshold of four ionization electrons,the signal rate is 955 per day.The detector is designed to be shielded well from cosmogenic backgrounds and ambient radioactivities to reach a 16%background-tosignal ratio in the energy region of interest.With the large CEvNS sample,the expected sensitivity of measuring the weak mixing angle sin^(2)θ_(w),and of limiting the neutrino magnetic moment are discussed.In addition,a synergy between the reactor antineutrino CEvNS experiment and the dark matter experiment is foreseen.展开更多
基金Supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(2018R1A5A1025563,2023R1A2C1003177,IBS-R031-D1)。
文摘In this study,we calculated the inclusive charged-current neutrino-nucleus scattering from ^(40)Ar in the quasielastic region.To explore the effect of uncertainties stemming from the nuclear structure,we used the KIDS(Korea-IBS-Daegu-SKKU)nuclear energy density functional and Skyrme force models,namely SLy4,SkI3,and MSk7.These models were selected to have distinct behavior in terms of the density dependence of the symmetry energy and the effective mass of the nucleon.In the charged-current neutrino scattering,the single-and double-differential cross sections were calculated for various kinematics.Total cross sections are reported as a function of the incident neutrino energy.The theoretical cross sections were compared with experimental data,and the roles of the effective mass and symmetry energy were investigated in terms of charged-current neutrino-nucleus scattering.
文摘The effects of ion screening in stellar core collapses are investigated based on a new progenitor star model. Simulation results show that ion screening slightly affects the leptons and decreases explosion energy, which is a negative factor for energy transfer supernova explosions. We also investigate the effect on type Ⅱ-supernova explosions of neutrino-nucleus elastic scattering based on the new progenitor star model. It is shown that, compared with the previously calculated results, neutrinos-nucleus elastic scattering in stellar core collapses is more severe, leading to an obvious reduction of the neutrino leakage energy loss and an increase of supernova explosion energy.
基金National Key R&D Program of China(2016YFA0400304)National Natural Science Foundation of China(11975244).
文摘Background We propose to measure the coherent elastic neutrino-nucleus scattering(CEvNS)using a dual-phase liquid argon time projection chamber(TPC)with 200 kg fiducial mass.The detector is expected to be adjacent to the JUNOTAO experiment and to be about 35 m from a reactor core with 4.6 GW thermal power at Taishan.The antineutrino flux is approximately 6×10^(12)cm^(−1)s^(−1) at this location,leading to more than 11,000 coherent scattering events per day in the fiducial mass.Motivation The nuclear recoil energies concentrate in the sub-keV region,corresponding to less than ten ionization electrons in the liquid argon.The key question is how to veto and shield the background in the hall where the vertical overburden is about 5 m.w.e.And what is the signal count rate and the background rate.In addition,what physical parameters can be measured what is the sensitivity.Methods We used the Geant4 to simulate the backgrounds from cosmic ray muons and ambient radioactivity decays.And a veto and shielding design is presented.Then a χ^(2) function is constructed and the sensitivity calculate package built to calculate the sensitivity of physical parameters.Results The detection of several ionization electrons can be achieved in the dual-phase TPC due to the large amplification in the gas region.With a feasible detection threshold of four ionization electrons,the signal rate is 955 per day.The detector is designed to be shielded well from cosmogenic backgrounds and ambient radioactivities to reach a 16%background-tosignal ratio in the energy region of interest.With the large CEvNS sample,the expected sensitivity of measuring the weak mixing angle sin^(2)θ_(w),and of limiting the neutrino magnetic moment are discussed.In addition,a synergy between the reactor antineutrino CEvNS experiment and the dark matter experiment is foreseen.
