A5004838685- Planetary Science and Exploration
- Astro and Planetary Science
- Nuclear Physics and Applications
- Gamma-ray bursts and supernovae
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Astronomical Observations and Instrumentation
- Radiation Therapy and Dosimetry
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
- Scientific Research and Discoveries
- Spaceflight effects on biology
- Methane Hydrates and Related Phenomena
- Radioactivity and Radon Measurements
- Electromagnetic Simulation and Numerical Methods
- Isotope Analysis in Ecology
- Numerical methods in inverse problems
- Radiation Detection and Scintillator Technologies
- Electromagnetic Scattering and Analysis
- Optical and Acousto-Optic Technologies
- Microwave Imaging and Scattering Analysis
- Atomic and Subatomic Physics Research
Space Research Institute
2016-2025
Joint Institute for Nuclear Research
2016-2017
Russian Academy of Sciences
2011-2015
V. N. Karazin Kharkiv National University
2010-2013
Hydrogen has been inferred to occur in enhanced concentrations within permanently shadowed regions and, hence, the coldest areas of lunar poles. The Lunar Crater Observation and Sensing Satellite (LCROSS) mission was designed detect hydrogen-bearing volatiles directly. Neutron flux measurements Moon's south polar region from Exploration Detector (LEND) on Reconnaissance Orbiter (LRO) spacecraft were used select optimal impact site for LCROSS. LEND data show several where epithermal neutron...
Results are presented for the LEND instrument onboard LRO detection of local spots suppression and excess epithermal neutron emission at lunar poles. Twelve Neutron Suppression Regions (NSRs) Excess (NERs) detected. It is shown using data from LOLA Diviner instruments that six NSRs have empirical property “ less irradiation lower temperature – fewer neutrons. ” These may be identified with water‐ice rich permafrost on Moon. detected include in both permanently shadowed illuminated areas,...
We present a generalized analytic formalism for the inverse Compton X-ray emission from hydrogen-poor supernovae and apply this framework to SN 2011fe using Swift X-Ray Telescope (XRT), UVOT, Chandra observations. characterize optical properties of in bands find them be broadly consistent with "normal" Ia, however, no source is detected by either XRT or Chandra. constrain progenitor system mass-loss rate (3σ c.l.) wind velocity vw = 100 km s−1. Our result rules out symbiotic binary...
We use measurements from the Lunar Exploration Neutron Detector (LEND) collimated sensors during more than one year of mapping phase NASA's Reconnaissance Orbiter (LRO) mission to make estimates epithermal neutron flux within known large Permanently Shadowed Regions (PSRs). These are compared with local background measured outside PSRs in sunlit regions. Individual and collective analyses PSR properties have been performed. Only three PSRs, Shoemaker Cabeus south Rozhdestvensky U north,...
Gamma-ray bursts (GRBs) are characterized by ultra-relativistic outflows, while supernovae generally non-relativistic ejecta. GRB afterglows decelerate rapidly, usually within days, because their low-mass ejecta rapidly sweep up a comparatively larger mass of circumstellar material. However, with heavy can be in nearly free expansion for centuries. Supernovae were thought to have outflows except few relativistic ones accompanied GRBs. This clear division was blurred SN 2009bb, the first...
The recent availability of large volume cerium bromide crystals raises the possibility substantially improving gamma-ray spectrometer limiting flux sensitivities over current systems based on lanthanum tri-halides, e.g., and chloride, especially for remote sensing, low-level counting applications or any type measurement characterized by poor signal to noise ratios. Russian Space Research Institute has developed manufactured a highly sensitive sensing observations planet Mercury from Polar...
Studies of hydrogen deposition in the shallow Martian subsurface have been conducted by two neutron and one gamma-ray detectors past provided global maps (Boynton et al., 2002; Feldman Mitrofanov 2002). It is known from these that most abundant polar permafrost areas compared to equatorial band where frozen water not stable on surface. However, spatial resolution hundreds kilometres typical for does allow detection local hydrogen-rich features can be associated with geological structures....
The dosimeter Liulin-MO for measuring the radiation environment onboard ExoMars Trace Gas Orbiter (TGO) is a module of Fine Resolution Epithermal Neutron Detector (FREND). Here we present results from measurements charged particle fluxes, dose rates and estimation equivalent at TGO Mars science orbit, provided by May 2018 to June 2022. period covers declining minimum phases solar activity in 24th cycle rising phase 25th cycle. Compared are values galactic cosmic rays (GCR) obtained during...
GRB 051103 is considered to be a candidate soft gamma repeater (SGR) extragalactic giant magnetar flare by virtue of its proximity on the sky M81/M82, as well time history, localization and energy spectrum. We have derived refined interplanetary network for this burst which reduces size error box over factor 2. examine history evidence periodic component, would one signature an SGR flare, conclude that component neither detected nor detectable under reasonable assumptions. analyse...
We report on the bright burst detected by four Interplanetary network (IPN) spacecraft 2015 April 12. The IPN localization of source is consistent with position recently discovered soft gamma-repeater SGR 1935+2154. From Konus-Wind (KW) observation, we derive temporal and spectral parameters emission, energetics. rather long duration (∼1.7 s) large measured energy fluence (∼2.5 × 10−5 erg cm−2) put it in class rare 'intermediate' (SGR) flares, this first one observed from A search for...
Abstract The Dynamic Albedo of Neutron (DAN) instrument on board the Mars Science Laboratory Curiosity rover acquired a series measurements as part an observational campaign Kimberley area in Gale crater. These observations were planned to assess variability bulk hydrogen and neutron‐absorbing elements, characterized chlorine‐equivalent concentration, geologic members formation surface materials exposed throughout area. During traverse area, drove primarily over “Smooth Hummocky” unit, unit...
The dosimeter Liulin-MO for measuring the radiation environment on board ExoMars Trace Gas Orbiter (TGO) is a module in Fine Resolution Epithermal Neutron Detector (FREND). A number of solar energetic particle (SEP) events were observed Mars orbit from July 2021 to 2024 during increasing phase and close maximum 25th cycle activity. results SEPs measurements obtained 2021-2023 by have been previously reported. Here we present observation parameters SEP January- October 2024. most powerful...
GRB 110918A is the brightest long detected by Konus-WIND during its 19 years of continuous observations and most luminous ever observed since beginning cosmological era in 1997. We report on final IPN localization this event detailed multiwavelength study with a number space-based instruments. The prompt emission characterized typical duration, moderare $E_{peak}$ time-integrated spectrum, strong hard-to-soft evolution. high energy fluence yields, at z=0.984, huge isotropic-equivalent...
The scientific objectives of neutron mapping the Moon are presented as 3 investigation tasks NASA's Lunar Reconnaissance Orbiter mission. Two focus on hydrogen content over entire and testing presence water-ice deposits at bottom permanently shadowed craters lunar poles. third task corresponds to determination contribution total radiation dose an altitude 50 km above Moon. We show that Exploration Neutron Detector (LEND) will be capable carrying out all investigations. design concept LEND is...
Abstract The Dynamic Albedo of Neutrons (DAN) instrument on board Mars Science Laboratory has been operating successfully since the landing and making measurements regularly along Curiosity's traverse at surface. DAN measures thermal ( E < 0.4 eV) epithermal neutrons (0.4 eV ~1 keV) while in two different modes: active passive. mode uses a pulsed neutron generator (PNG) to study geological characteristics subsurface. In passive mode, background environment. This paper presents results...
Between the launch of \textit{GGS Wind} spacecraft in 1994 November and end 2010, Konus-\textit{Wind} experiment detected 296 short-duration gamma-ray bursts (including 23 which can be classified as short with extended emission). During this period, IPN consisted up to eleven spacecraft, using triangulation, localizations 271 were obtained. We present most comprehensive localization data on these events. The burst detection rate, $\sim$18 per year, exceeds that many individual experiments.
We present Interplanetary Network (IPN) data for the gamma-ray bursts in first Fermi Gamma-Ray Burst Monitor (GBM) catalog. Of 491 that catalog, covering 2008 July 12 to 2010 11, 427 were observed by at least one other instrument 9-spacecraft IPN. 427, localizations of 149 could be improved arrival time analysis (or triangulation). For any given burst GBM and distant spacecraft, triangulation gives an annulus possible directions whose half-width varies between about 0.4' 32 degrees,...
Effective algorithm for processing impulse signals which are scattered by plane-layered media is discussed. The case, when effective thickness of layers less than spatial size an under consideration. Such problem evaluating properties (thickness) rather complicated the implementation. Brief theoretical analysis possibilities various approaches carried out. Computational and corresponding software evaluation not only a time delay, but also geometrical characteristics investigated structures...