J. Khuyagbaatar
A5054951997- Nuclear physics research studies
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Radiopharmaceutical Chemistry and Applications
- Advanced Chemical Physics Studies
- Cold Fusion and Nuclear Reactions
- Particle accelerators and beam dynamics
- Radioactive element chemistry and processing
- Rare-earth and actinide compounds
- Particle Detector Development and Performance
- Ion-surface interactions and analysis
- Nuclear Materials and Properties
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Radiation Detection and Scintillator Technologies
- Organometallic Complex Synthesis and Catalysis
- Fusion materials and technologies
- Inorganic and Organometallic Chemistry
- Radioactive contamination and transfer
- Pulsed Power Technology Applications
- Particle physics theoretical and experimental studies
Johannes Gutenberg University Mainz
2015-2025
GSI Helmholtz Centre for Heavy Ion Research
2016-2025
Helmholtz Institute Mainz
2016-2025
Central University of Kerala
2021
Australian National University
2015
Japan Atomic Energy Agency
2008-2009
Goethe University Frankfurt
2008-2009
University of Jyväskylä
2008-2009
Comenius University Bratislava
2008-2009
Joint Institute for Nuclear Research
2009
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at gas-filled recoil separator TASCA GSI Darmstadt, Germany. radioactive decay of residues and their α-decay products studied using a detection setup that allowed measuring decays single nuclei half-lives between sub-μs few days. Two chains comprising seven α spontaneous fission each were identified are assigned to isotope (294)117 its products. A hitherto unknown...
The fusion-evaporation reaction Pu244(Ca48,3−4n)114288,289 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to production of 114288,289. At a compound nucleus excitation energy E*=39.8–43.9 MeV, 4n evaporation channel cross section 9.8−3.1+3.9 pb. E*=36.1–39.5 that 3n 8.0−4.5+7.4 In one chains, previously unobserved α branch in Ds281 (probability be random origin from background: 0.1%). This populated Hs277, which decayed...
Experiments with the new recoil separator, Transactinide Separator and Chemistry Apparatus (TASCA), at GSI were performed by using beams of $^{48}\mathrm{Ca}$ to irradiate targets $^{206\ensuremath{-}208}\mathrm{Pb}$, which led production $^{252\ensuremath{-}254}\mathrm{No}$ isotopes. These studies allowed for evaluation performance TASCA when coupled a detector electronics system. By following these studies, isotopes element 114 (${}^{288\ensuremath{-}291}$114) produced in irradiations...
A high-resolution α, x-ray, and γ-ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum für Schwerionenforschung. Thirty correlated α-decay chains were detected following fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay to originate from element Z=115. For first time, precise allows derivation excitation schemes isotopes along starting elements Z>112. Comprehensive Monte Carlo simulations...
The electron shell structure of superheavy elements, i.e., elements with atomic number Z ≥ 104, is influenced by strong relativistic effects caused the high Z. Early calculations on element 112 (copernicium, Cn) and 114 (flerovium, Fl) having closed quasi-closed configurations 6d107s2 6d107s27p1/22, respectively, predicted them to be noble-gas-like due very 7s 7p1/2 valence orbitals. Recent fully studying Cn Fl in different environments suggest less reactive compared their lighter homologues...
In deep inelastic multinucleon transfer reactions of 48Ca + 248Cm we observed about 100 residual nuclei with proton numbers between Z=82 and Z=100. Among them, there are five new neutron-deficient isotopes: 216U, 219Np, 223Am, 229Am 233Bk. As separator for the products used velocity filter SHIP GSI while isotope identification was performed via α decay chains nuclei. These first results reveal that together here applied fast sensitive separation detection techniques promising synthesis...
We report the discovery of new isotope $^{252}$Rf. With its extremely short half-life $60^{+90}_{-30}$~ns, it expands range half-lives known superheavy nuclei by about two orders magnitude. This nucleus was synthesized in high-$K$ isomeric state, for which we measured a $13^{+4}_{-3}$~$\mu$s. Our results confirm smooth onset decreasing ground-state spontaneous fission neutron-deficient Rf isotopes towards isotopic border $10^{-14}$~s, is time needed to form an atomic shell. findings set...
Experimental investigations of transactinoide elements provide benchmark results for chemical theory and probe the predictive power trends in periodic table. So far, gas-phase reactions, simple inorganic compounds with its highest oxidation state have been synthesized. Single-atom production rates, short half-lives, harsh experimental conditions limited number experimentally accessible compounds. We applied a carbonylation technique previously tested on short-lived molybdenum (Mo) tungsten...
Two short-lived isotopes ^{221}U and ^{222}U were produced as evaporation residues in the fusion reaction ^{50}Ti+^{176}Yb at gas-filled recoil separator TASCA. An α decay with an energy of E_{α}=9.31(5) MeV half-life T_{1/2}=4.7(7) μs was attributed to ^{222}U. The new isotope identified α-decay chains starting E_{α}=9.71(5) T_{1/2}=0.66(14) leading known daughters. Synthesis detection these unstable heavy nuclei their descendants achieved thanks a fast data readout system. evolution N=126...
Until recently, ground-state nuclear moments of the heaviest nuclei could only be inferred from spectroscopy, where model assumptions are required. Laser spectroscopy in combination with modern atomic structure calculations is now able to probe these directly, a comprehensive and nuclear-model-independent way. Here we report on unique access differential mean-square charge radii ^{252,253,254}No, therefore changes size shape. State-of-the-art density functional describe well region heavy...
A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in $^{50}\mathrm{Ti}+^{249}\mathrm{Bk}$ $^{50}\mathrm{Ti}+^{249}\mathrm{Cf}$ fusion-evaporation reactions, respectively, at gas-filled recoil separator TASCA GSI Darmstadt, Germany. Over four months irradiation, $^{249}\mathrm{Bk}$ target partially decayed into $^{249}\mathrm{Cf}$, which allowed a simultaneous both elements. Neither detected cross-section sensitivity levels 65 200 fb midtarget...
One of the most important atomic properties governing an element's chemical behavior is energy required to remove its least-bound electron, referred as first ionization potential. For heaviest elements, this fundamental quantity strongly influenced by relativistic effects which lead unique properties. Laser spectroscopy on atom-at-a-time scale was developed and applied probe optical spectrum neutral nobelium near threshold. The potential determined here with a very high precision from...
The discovery that copernicium can decay into a new isotope of darmstadtium and the observation previously unseen excited state provide clues to location ``island stability.''
Chemical reactivity of the superheavy elements nihonium (Nh, element 113) and moscovium (Mc, 115) has been studied by gas-solid chromatography method using a new combined detection setup. The Mc isotope, 288 Mc, was produced in nuclear fusion reaction 48 Ca ions with 243 Am targets at GSI Helmholtzzentrum Darmstadt, Germany. After isolating gas-filled separator TASCA, adsorption its decay product 284 Nh on silicon oxide gold surfaces investigated. As result this work, values enthalpy surface...
The synthesis of isotopes the element hassium was studied using reaction S34+U238→Hs272*. At a kinetic energy 163.0 MeV in center-of-mass system we observed one α-decay chain starting at isotope Hs267. cross section 1.8−1.5+4.2 pb. 152.0 decay new Hs268 observed. It decays with half-life 0.38−0.17+1.8 s by 9479±16 keV α-particle emission. Spontaneous fission daughter nucleus Sg264 confirmed. measured 0.54−0.45+1.3 In-beam measurements fission-fragment mass distributions were performed to...
Mass distributions of fission fragments from the compound nuclei 180Hg and 190Hg formed in fusion reactions 36Ar + 144Sm 154Sm, respectively, were measured at initial excitation energies E⁎(Hg180)=33–66 MeV E⁎(Hg190)=48–71 MeV. In 180Hg, mass spectra well reproduced by assuming only an asymmetric-mass division, with most probable light heavy fragment masses A¯L/A¯H=79/101. The asymmetry for agrees that obtained low-energy β+/EC-delayed 180Tl, our earlier ISOLDE(CERN) experiment. Fission is...
Background: Mass-asymmetric fission has been observed in low energy of $^{180}\mathrm{Hg}$. Calculations predicted the persistence asymmetric this region even at excitation energies 30--40 MeV.Purpose: To investigate mass distributions by populating different isotopes Hg using heavy ion fusion reactions.Methods: Fission fragment mass-angle have measured for two reactions, $^{40}\mathrm{Ca}+^{142}\mathrm{Nd}$ and $^{13}\mathrm{C}+^{182}\mathrm{W}$, $^{182}\mathrm{Hg}$ $^{195}\mathrm{Hg}$,...
Forty-six decay chains, assigned to the of 288115, were produced using 243Am(48Ca,3n)288115 reaction at Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series α decays studied α-photon and α-x-ray spectroscopies. Multiple coincidences observed in element 115 chain members, particularly third- fourth-generation (presumed be 280Rg 276Mt, respectively). Upon combining these data with those from 22 288115 chains a similar experiment, updated level schemes 276Mt 272Bh...