A5047962494- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- High-Energy Particle Collisions Research
- Cancer Treatment and Pharmacology
- Nuclear Physics and Applications
- Galaxies: Formation, Evolution, Phenomena
- Quantum, superfluid, helium dynamics
- Marine and fisheries research
- Inorganic Fluorides and Related Compounds
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Radioactivity and Radon Measurements
- CCD and CMOS Imaging Sensors
- Laser-Matter Interactions and Applications
- Superconducting and THz Device Technology
- Age of Information Optimization
Hemwati Nandan Bahuguna Garhwal University
2023-2025
Academia Sinica
2014-2025
Virginia Tech
2020-2024
Institute of Physics, Academia Sinica
2016-2024
Banaras Hindu University
1973-2022
University of South Carolina
2021
Institute of Physics
2017-2021
University of Wisconsin–Madison
1994
We report new results from the search for neutrinoless double-beta decay in $^{130}$Te with CUORE detector. This benefits a four-fold increase exposure, lower trigger thresholds and analysis improvements relative to our previous results. observe background of $(1.38\pm0.07)\cdot10^{-2}$ counts$/($keV$\cdot$kg$\cdot$yr$)$ $0\nu\beta\beta$ region interest and, total exposure 372.5 kg$\cdot$yr, we attain median exclusion sensitivity $1.7\cdot10^{25}$ yr. find no evidence set $90\%$ CI Bayesian...
Abstract The possibility that neutrinos may be their own antiparticles, unique among the known fundamental particles, arises from symmetric theory of fermions proposed by Ettore Majorana in 1937 1 . Given profound consequences such neutrinos, which is a potential explanation for matter–antimatter asymmetry universe via leptogenesis 2 , nature commands intense experimental scrutiny globally; one primary probes neutrinoless double beta (0 νββ ) decay. Here we show results search 0 decay 130...
Neutrino-nucleus elastic scattering (νA_{el}) with partial quantum-mechanical coherency has been observed in several nuclei neutrinos from decay-at-rest pions. This interaction reactor where is >95% not yet experimentally observed. We present new results on the studies of νA_{el} cross section an electrocooled p-type point-contact germanium detector at Kuo-Sheng Reactor Neutrino Laboratory. A total 242(357) kg-days ON(OFF) data a threshold 200 eV ionization energy are analyzed. The Lindhard...
We report results on the searches of weakly interacting massive particles (WIMPs) with sub-GeV masses (m_{χ}) via WIMP-nucleus spin-independent scattering Migdal effect incorporated. Analysis time-integrated (TI) and annual modulation (AM) effects CDEX-1B data are performed, 737.1 kg day exposure 160 eVee threshold for TI analysis, 1107.5 250 AM analysis. The sensitive windows in m_{χ} expanded by an order magnitude to lower DM New limits σ_{χN}^{SI} at 90% confidence level derived as...
We report the first results of a light weakly interacting massive particles (WIMPs) search from CDEX-10 experiment with 10 kg germanium detector array immersed in liquid nitrogen at China Jinping Underground Laboratory physics data size 102.8 day. At an analysis threshold 160 eVee, improved limits 8×10^{-42} and 3×10^{-36} cm^{2} 90% confidence level on spin-independent spin-dependent WIMP-nucleon cross sections, respectively, WIMP mass (m_{χ}) 5 GeV/c^{2} are achieved. The lower reach m_{χ}...
We measured two-neutrino double beta decay of $^{130}\mathrm{Te}$ using an exposure 300.7 kg yr accumulated with the CUORE detector. Using a Bayesian analysis to fit simulated spectra experimental data, it was possible disentangle all major background sources and precisely measure contribution. The half-life is in agreement past measurements strongly reduced uncertainty:...
We present new constraints on light dark matter boosted by cosmic rays (CRDM) using the 205.4 kg day data of CDEX-10 experiment conducted at China Jinping Underground Laboratory. The Monte Carlo simulation package CJPL\_ESS was employed to evaluate Earth shielding effect. Several key factors have been introduced and discussed in our CRDM analysis, including contributions from heavier CR nuclei than proton helium, inhomogeneity distribution, impact form factor attenuation calculation. Our...
Dark matter direct detection experiments mostly operate at deep underground laboratories. It is necessary to consider shielding effect of the Earth, especially for dark particles interacting with a large cross section. We analyzed and simulated Earth China Jinping Underground Laboratory (CJPL) simulation package, CJPL Shielding Simulation code (CJPL_ESS), which applicable other locations. The further constraints on $\ensuremath{\chi}\text{\ensuremath{-}}\mathrm{N}$ section exclusion regions...
We present improved germanium-based constraints on sub-GeV dark matter via matter-electron (χ-e) scattering using the 205.4 kg·day dataset from CDEX-10 experiment. Using a novel calculation technique, we attain predicted χ-e spectra observable in high-purity germanium detectors. In heavy mediator scenario, our results achieve 3 orders of magnitude improvement for m_{χ} larger than 80 MeV/c^{2} compared to previous results. also most stringent cross-section limit date among experiments...
The CDEX-1 experiment conducted a search of low-mass (< 10 GeV/c2) Weakly Interacting Massive Particles (WIMPs) dark matter at the China Jinping Underground Laboratory using p-type point-contact germanium detector with fiducial mass 915 g physics analysis threshold 475 eVee. We report hardware set-up, characterization, data acquisition and procedures this experiment. No excess unidentified events are observed after subtraction known background. Using 335.6 kg-days data, exclusion constraints...
Neutrino-nucleus elastic scattering provides a unique laboratory to study the quantum mechanical coherency effects in electroweak interactions, towards which several experimental programs are being actively pursued. We report results of our quantitative studies on transitions decoherency. A parameter ($\alpha$) is identified describe degree coherency, and its variations with incoming neutrino energy, detector threshold target nucleus studied. The ranges $\alpha$ can be probed realistic...
We present results on light weakly interacting massive particle (WIMP) searches with annual modulation (AM) analysis data from a 1-kg mass p-type point-contact germanium detector of the CDEX-1B experiment at China Jinping Underground Laboratory. Datasets total live time 3.2 yr within 4.2-yr span are analyzed threshold 250 eVee. Limits WIMP-nucleus (χ-N) spin-independent cross sections as function WIMP (m_{χ}) 90% confidence level (C.L.) derived using dark matter halo model. Within context...
We report constraints on the dark photon effective kinetic mixing parameter (${\kappa}$) with data taken from two ${p}$-type point-contact germanium detectors of CDEX-10 experiment at China Jinping Underground Laboratory. The 90\% confidence level upper limits ${\kappa}$ solar 205.4 kg-day exposure are derived, probing new space masses (${m_V}$) 10 to 300 eV/${c^2}$ in direct detection experiments. Considering as cosmological matter, ${m_V}$ 0.1 4.0 keV/${c^2}$ set 449.6 data, a minimum...
Relativistic millicharged particles ($\chi_q$) have been proposed in various extensions to the Standard Model of particle physics. We consider scenarios where they are produced at nuclear reactor core and via interactions cosmic-rays with earth's atmosphere. Millicharged could also be candidates for dark matter, become relativistic through acceleration by supernova explosion shock waves. The atomic ionization cross section $\chi_q$ matter derived equivalent photon approximation. Smoking-gun...
After decades of experimental efforts, the DAMA/LIBRA(DL) annual modulation (AM) analysis on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>χ</a:mi><a:mi mathvariant="normal">N</a:mi></a:math> (WIMP dark matter interactions nucleus) channel remains only one which can be interpreted as positive signatures. This has been refuted by numerous time-integrated (TI) and AM analysis. It shown that <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"...
We report the results of searches for solar axions and galactic dark matter or axionlike particles with CDEX-1 experiment at China Jinping Underground Laboratory, using 335.6 kg days data from a $p$-type point-contact germanium detector. The are compatible background model, no excess signals observed. Limits on model-independent coupling ${g}_{Ae}<2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ Compton, bremsstrahlung, atomic-recombination, deexcitation channels...
We report results of a search for light weakly interacting massive particle (WIMP) dark matter from the CDEX-1 experiment at China Jinping Underground Laboratory (CJPL). Constraints on WIMP-nucleon spin-independent (SI) and spin-dependent (SD) couplings are derived with physics threshold 160 eVee, an exposure 737.1 kg-days. The SI SD limits extend lower reach WIMPs to 2 GeV improve over our earlier bounds WIMP mass less than 6 GeV.
We present the improved constraints on couplings of solar axions and more generic bosonic dark matter particles using 737.1 kg-days data from CDEX-1B experiment. The experiment, located at China Jinping Underground Laboratory, primarily aims direct detection weakly interacting massive a p-type point-contact germanium detector. adopt profile likelihood ratio method for analysis in presence backgrounds. An energy threshold 160 eV was achieved, much better than 475 CDEX-1A with an exposure...
The low energy coherent neutrino-nucleus elastic scattering is being studied in a number of experimental programs around the world. As part TEXONO's neutrino research program at Kuo-Sheng nuclear power plant, state-of-art high purity point-contact Germanium detectors with $\mathcal{O}{(100}$~eV) threshold are utilized to study such interactions complete coherency regime. This work will provide an overview current activities and recent results TEXONO experiment. We also discuss quantitative...
A natural broad energy germanium (BEGe) detector is operated in the China Jinping Underground Laboratory (CJPL) for a feasibility study of building next generation experiment neutrinoless double-beta (0{$\nu\beta\beta$}) decay $^{76}$Ge. The setup prototype facility, characteristics BEGe detector, background reduction methods, and data analysis are described this paper. index 6.4$\times$10$^{-3}$ counts/(keV$\cdot$kg$\cdot$day) achieved 1.86 times lower than our previous result CDEX-1...