A5022696400- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Relativity and Gravitational Theory
- Galaxies: Formation, Evolution, Phenomena
- Superconducting and THz Device Technology
- Neutrino Physics Research
- Advanced Differential Geometry Research
- CCD and CMOS Imaging Sensors
- Advanced Thermodynamics and Statistical Mechanics
- Gaussian Processes and Bayesian Inference
- Geophysics and Gravity Measurements
- Quantum, superfluid, helium dynamics
- Advanced Surface Polishing Techniques
- ECG Monitoring and Analysis
- Laser Material Processing Techniques
- Diamond and Carbon-based Materials Research
- Calibration and Measurement Techniques
- Astrophysics and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
Serampore College
2025
Institute of High Energy Physics
2022-2024
TU Wien
2022-2024
National Institute of Science Education and Research
2018-2023
Homi Bhabha National Institute
2022-2023
Austrian Academy of Sciences
2022-2023
Dibrugarh University
2015-2018
We present the first limits on inelastic electron-scattering dark matter and photon absorption using a prototype SuperCDMS detector having charge resolution of 0.1 electron-hole pairs (CDMS HVeV, 0.93 g CDMS high-voltage device). These electron-recoil significantly improve experimental constraints particles with masses as low 1 MeV/c^{2}. demonstrate sensitivity to photons competitive other leading approaches but substantially less exposure (0.49 d). results scientific potential...
This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, photon axion-like particle absorption, using a second-generation SuperCDMS high-voltage eV-resolution detector. The 0.93 gram Si detector achieved 3 eV phonon energy resolution; for bias 100 V, this corresponds to charge resolution 3% single electron-hole pair. spectrum is reported from blind with 1.2 gram-days exposure acquired in above-ground laboratory. With carrier...
We present limits on spin-independent dark matter-nucleon interactions using a 10.6 g Si athermal phonon detector with baseline energy resolution of ${\ensuremath{\sigma}}_{E}=3.86\ifmmode\pm\else\textpm\fi{}0.04(\mathrm{stat}{)}_{\ensuremath{-}0.00}^{+0.19}(\mathrm{syst})\text{ }\text{ }\mathrm{eV}$. This exclusion analysis sets the most stringent scattering cross-section achieved by cryogenic for matter particle masses from 93 to $140\text{ }\mathrm{MeV}/{c}^{2}$, raw exposure 9.9 d...
Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact this excess on dark matter or neutrino sensitivity these experiments, collective effort has been started share knowledge about individual observations. For this, EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare search collaborations contributed initiative via talks...
We report the result of a blinded search for Weakly Interacting Massive Particles (WIMPs) using majority SuperCDMS Soudan dataset. With an exposure 1690 kg days, single candidate event is observed, consistent with expected backgrounds. This analysis (combined previous Ge results) sets upper limit on spin-independent WIMP--nucleon cross section $1.4 \times 10^{-44}$ ($1.0 10^{-44}$) cm$^2$ at 46 GeV/$c^2$. These results set strongest limits WIMP--germanium-nucleus interactions masses $>$12
The Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) searches for interactions between dark matter particles and germanium nuclei in cryogenic detectors. has achieved a energy with improved sensitivity to low-mass (<10 GeV/c$^2$) particles. We present an analysis of the final CDMSlite data set, taken different detector than was used two previous sets. This includes "salting" method protect against bias, noise discrimination, background modeling, use profile...
We present limits on the spin-independent interaction cross section of dark matter particles with silicon nuclei, derived from data taken a cryogenic calorimeter 0.35 g target mass operated in CRESST-III experiment. A baseline nuclear recoil energy resolution (1.36±0.05) eVnr, currently lowest reported for macroscopic particle detectors, and corresponding threshold (10.0±0.2) eVnr have been achieved, improving sensitivity to light masses below 160 MeV/c2 by factor up 20 compared previous...
We present an analysis of electron recoils in cryogenic germanium detectors operated during the SuperCDMS Soudan experiment. The data are used to set new constraints on axioelectric coupling axionlike particles and kinetic mixing parameter dark photons, assuming respective species constitutes all galactic matter. This study covers mass range from $40\text{ }\text{ }\mathrm{eV}/{c}^{2}$ $500\text{ }\mathrm{keV}/{c}^{2}$ for both candidates, excluding previously untested space masses below...
In the past decades, numerous experiments have emerged to unveil nature of dark matter, one most discussed open questions in modern particle physics. Among them, CRESST experiment, located at Laboratori Nazionali del Gran Sasso, operates scintillating crystals as cryogenic phonon detectors. this work, we present first results from operation two detector modules which both 10.46 g LiAlO$_2$ targets CRESST-III. The lithium contents crystal are $^6$Li, with an odd number protons and neutrons,...
The CRESST experiment observes an unexplained excess of events at low energies. In the current CRESST-III data-taking campaign we are operating detector modules with different designs to narrow down possible explanations. this work, show first observations ongoing measurement, focusing on comparison time, energy and temperature dependence in several detectors. These exclude dark matter, radioactive backgrounds intrinsic sources related crystal bulk as a major contribution.
We present a new analysis of previously published SuperCDMS data using profile likelihood framework to search for sub-GeV dark matter (DM) particles through two inelastic scattering channels: bremsstrahlung radiation and the Migdal effect. By considering these possible channels, experimental sensitivity can be extended DM masses that are undetectable DM-nucleon elastic channel, given energy threshold current experiments. exclude down $220~\textrm{MeV}/c^2$ at $2.7 \times...
Fake reviews on digital platforms are proliferating to a great extent, which is challenge the integrity of consumer ecosystems. This has put development reliable detection mechanisms as critical research priority in influencing purchasing behavior and business reputation. In this paper, rule-based feature-engineered machine learning systems, deep neural networks, transformer-based architectures, emerging intent-aware frameworks comprehended concerning fake review detection. These approaches...
We measured the nuclear-recoil ionization yield in silicon with a cryogenic phonon-sensitive gram-scale detector. Neutrons from monoenergetic beam scatter off of nuclei at angles corresponding to energy depositions 4 keV down 100 eV, lowest probed so far. The results show no sign an production threshold above eV. These call for further investigation theory and comprehensive determination detector response function energies below scale.
The main goal of the CRESST-III experiment is direct detection dark matter particles via their scattering off target nuclei in cryogenic detectors. In this work we present results a silicon-on-sapphire (SOS) detector with mass 0.6 g and an energy threshold <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mn>6.7</a:mn><a:mo>±</a:mo><a:mn>0.2</a:mn><a:mo stretchy="false">)</a:mo><a:mtext> </a:mtext><a:mtext>...
Recent experiments searching for $\mathrm{sub}\text{\ensuremath{-}}\mathrm{GeV}/{c}^{2}$ dark matter have observed event excesses close to their respective energy thresholds. Although specific the individual technologies, measured excess rates been consistently reported at or below energies of a few-hundred eV, with charges few electron-hole pairs. In present work, we operated 1-g silicon SuperCDMS-HVeV detector three voltages across crystal (0, 60 and 100 V). The 0 V data show an events in...
Abstract The CRESST experiment employs cryogenic calorimeters for the sensitive measurement of nuclear recoils induced by dark matter particles. recorded signals need to undergo a careful cleaning process avoid wrongly reconstructed recoil energies caused pile-up and read-out artefacts. We frame this as time series classification task propose automate it with neural networks. With data set over one million labeled records from 68 detectors, between 2013 2019 CRESST, we test capability four...
Two photo-neutron sources, $^{88}$Y$^{9}$Be and $^{124}$Sb$^{9}$Be, have been used to investigate the ionization yield of nuclear recoils in CDMSlite germanium detectors by SuperCDMS collaboration. This work evaluates for recoil energies between 1 keV 7 at a temperature $\sim$ 50 mK. We use Geant4 simulation model neutron spectrum assuming charge that is generalization standard Lindhard consists two energy dependent parameters. perform likelihood analysis using simulated spectrum, modeled...