M. K. Singh
A5040572726- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Metal complexes synthesis and properties
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Spacecraft and Cryogenic Technologies
- Plasma Diagnostics and Applications
- Energy Harvesting in Wireless Networks
- Organometallic Compounds Synthesis and Characterization
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- CCD and CMOS Imaging Sensors
- Synthesis and Characterization of Heterocyclic Compounds
- Inorganic and Organometallic Chemistry
- Lanthanide and Transition Metal Complexes
- Galaxies: Formation, Evolution, Phenomena
- Effects of Vibration on Health
- Nonlinear Optical Materials Research
- Dielectric properties of ceramics
- Biofield Effects and Biophysics
Banaras Hindu University
2015-2025
Academia Sinica
2015-2025
GLA University
2021-2025
Institute of Physics, Academia Sinica
2018-2024
Institute of Physics
2017-2024
Emirates Foundation
2024
University of Allahabad
2024
Management Sciences (United States)
2022
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 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...
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...
Abstract CDEX-50 is a next-generation project of the China Dark Matter Experiment (CDEX) that aims to search for dark matter using 50-kg germanium detector array. This paper comprises thorough summary experiment, including an investigation potential background sources and development model. Based on baseline model, projected sensitivity weakly interacting massive particle (WIMP) also presented. The expected level within energy region interest, set 2–2.5 keVee, ∼0.01 counts keVee -1 kg day ....
The study of metal complexes with physiologically active ligands has both scientific and practical implications. In this work, we investigated the formation binary ternary involving ions such as Cu (II), Ni Co (II) Zn specifically two relevant ligands: glutamine (A) major ligand thymine (B) secondary ligand. To evaluate complexation behaviour these species in aqueous environments, a potentiometric method was used at 37±1°C ionic strength, I = 0.1 M NaNO3. complexes' stability constants were...
Abstract The p-type point-contact germanium ( p PCGe) detectors have been widely adopted in searches for low energy physics events such as neutrinos and dark matter. This is due to their enhanced capabilities of background rejection, sensitivity at energies the sub-keV range particularly fine resolution. Nonetheless, PCGe subject irregular behaviour caused by surface effects near passivated surface. These can, general, be distinguished from that occur crystal bulk its slower pulse rise time....
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...
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"...
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...
We investigate exotic neutrino interactions using the 205.4 kg$\cdot$day dataset from CDEX-10 experiment at China Jinping Underground Laboratory. New constraints on mass and couplings of new gauge bosons are presented. Two nonstandard considered: a $U(1)_{B-L}$ gauge-boson-induced interaction between an active electron/nucleus, dark-photon-induced sterile electron/nucleus via kinetic mixing with photon. This work probes unexplored parameter space involving coupling dark laboratory limits...
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...
We present novel constraints on boosted light dark matter particles (denoted as ``$\ensuremath{\chi}$'') from evaporating primordial black holes (PBHs) using $205.4\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{day}$ data the China Jinping Underground Laboratory's CDEX-10 p-type point contact germanium detector with a 160 eVee analysis threshold. $\ensuremath{\chi}$ PBHs masses ranging $1\ifmmode\times\else\texttimes\fi{}{10}^{15}\text{ }\mathrm{g}$ to...
A search for exotic dark matter (DM) in the sub-GeV mass range has been conducted using 205 kg•day data taken from a p-type point contact germanium detector of CDEX-10 experiment at China Jinping underground laboratory.New low-mass searching channels, neutral current fermionic DM absorption (χ + → ν A) and DM-nucleus 3→2 scattering χ φ A), have analyzed with an energy threshold 160 eVee.No significant signal was found, thus new limits on DM-nucleon interaction cross section are set both...
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...