A5036015171- Nuclear physics research studies
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- Spectroscopy and Quantum Chemical Studies
- Rare-earth and actinide compounds
- Mass Spectrometry Techniques and Applications
- Quantum, superfluid, helium dynamics
- Radiopharmaceutical Chemistry and Applications
- Quantum and electron transport phenomena
- Radioactive Decay and Measurement Techniques
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Quantum Mechanics and Non-Hermitian Physics
- Particle accelerators and beam dynamics
- Molecular Junctions and Nanostructures
- Cold Atom Physics and Bose-Einstein Condensates
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy and Laser Applications
- Advanced Materials Characterization Techniques
- Quasicrystal Structures and Properties
- Mechanical and Optical Resonators
- Advanced Battery Materials and Technologies
Charles University
1976-2024
Helmholtz Institute Mainz
2010-2018
Johannes Gutenberg University Mainz
2010-2018
Lawrence Berkeley National Laboratory
2008-2014
University of California, Berkeley
2014
GSI Helmholtz Centre for Heavy Ion Research
2010-2012
Technical University of Munich
2006-2009
Brno University of Technology
2005
University of Waterloo
1996
Czech Academy of Sciences
1996
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...
Independent verification of the production element 114 in reaction 244-MeV ;{48}Ca with ;{242}Pu is presented. Two chains time- and position-correlated decays have been assigned to ;{286}114 ;{287}114. The observed decay modes, half-lives, energies agree published results. measured cross sections at a center-of-target energy 244 MeV for ;{242}Pu(;{48}Ca,3-4n);{287,286}114 reactions were 1.4_{-1.2};{+3.2} pb each, which are lower than reported values.
The new, neutron-deficient, superheavy element isotope ²⁸⁵114 was produced in ⁴⁸Ca irradiations of ²⁴²Pu targets at a center-of-target beam energy 256 MeV (E*=50 MeV). α decay ²⁸⁵114was followed by the sequential four daughter nuclides, 281Cn, 277Ds, 273Hs, and 269Sg. 265Rf observed to spontaneous fission. measured α-decay Q values were compared with those from macroscopic-microscopic nuclear mass model give insight into shell effects. The²⁴²Pu (⁴⁸Ca,5n²)²⁸⁵114 cross section 0.6(-0.5)+0.9 pb.
Theoretical calculations predict 270Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by alpha-particle emission. In this work, based on rapid chemical isolation of Hs isotopes produced in the 26Mg+248Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed new nuclide 270Hs, which decays emission with Qalpha=9.02+/-0.03 MeV 266Sg undergoes spontaneous fission half-life 444(-148)(+444) ms. A production cross section about 3 pb...
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...
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...
The analysis of a large body heavy ion fusion reaction data with medium-heavy projectiles ($6\ensuremath{\le}Z\ensuremath{\le}18$) and actinide targets suggests disappearance the $3n$ exit channel increasing atomic number projectile. Here, we report measurement excitation function $^{248}\mathrm{Cm}(^{26}\mathrm{Mg},xn)^{274\mathrm{\text{\ensuremath{-}}}x}\mathrm{Hs}$ observation new nuclide $^{271}\mathrm{Hs}$ produced in evaporation at beam energy well below Bass barrier cross section...
Isotopes of rutherfordium ($^{258\ensuremath{-}261}\mathrm{Rf}$) were produced in irradiations $^{238}\mathrm{U}$ targets with $^{26}\mathrm{Mg}$ beams. Excitation functions measured for the $4n,5n$, and $6n$ exit channels. Production $^{261}\mathrm{Rf}$ $3n$ channel a cross section ${28}_{\ensuremath{-}26}^{+92}$ pb was observed. $\ensuremath{\alpha}$-decay $^{258}\mathrm{Rf}$ observed first time an $\ensuremath{\alpha}$-particle energy 9.05 \ifmmode\pm\else\textpm\fi{} 0.03 MeV...
Current-induced bond rupture is a fundamental process in nanoelectronic architectures such as molecular junctions and scanning tunneling microscopy measurements of molecules at surfaces. The understanding the underlying mechanisms important for design that are stable higher bias voltages prerequisite further developments field current-induced chemistry. In this work, we analyse employing recently developed method, which combines hierarchical equations motion approach twin space with matrix...
Summary Two experiments aiming at the chemical investigation of element 112 produced in heavy ion induced nuclear fusion reaction 48 Ca with 238 U were performed Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany. Both designed to determine adsorption enthalpy on a gold surface using thermochromatography setup. The temperature range covered allowed Hg about 35 °C and Rn -180 °C. Reports from Flerov Laboratory for Nuclear Reactions (FLNR), Dubna, Russia claim production 5-min...
We report two-dimensional electron energy-loss spectra of CO_{2}. The high-resolution experiment reveals a counterintuitive fine structure at energy losses where CO_{2} states form vibrational pseudocontinuum. Guided by the symmetry system, we constructed four-dimensional nonlocal model for vibronic dynamics involving two shape resonances (forming Renner-Teller Π_{u} doublet equilibrium geometry) coupled to virtual Σ_{g}^{+} state. elucidates extremely non-Born-Oppenheimer nuclear motion and...
The deformed doubly magic nucleus Hs270 has so far only been observed as the four-neutron (4n) evaporation residue of reaction Mg26+Cm248, where a maximum cross section 3 pb was measured. Theoretical studies on formation in 4n channel fusion reactions with different entrance asymmetry framework two-parameter Smoluchowski equation predict that Ca48+Ra226 and S36+U238 result higher sections due to lower Q values, contrast simple arguments based asymmetry, which opposite trends. Calculations...
Abstract We report on the in-situ synthesis of metal carbonyl complexes with short-lived isotopes transition metals. Complexes molybdenum, technetium, ruthenium and rhodium were synthesized by thermalisation products neutron-induced fission 249 Cf in a carbon monoxide-nitrogen mixture. tungsten, rhenium, osmium, iridium thermalizing produced 24 Mg-induced fusion evaporation reactions monoxide containing atmosphere. The chemical took place at ambient temperature pressure conditions. rapidly...
The isotopic distribution of nuclei produced in the 50Ti + 249Cf reaction has been studied at gas-filled recoil separator TASCA GSI Darmstadt, which separates ions according to differences magnetic rigidity. bombardment was performed an energy around Bass barrier and with fields set for collecting fusion-evaporation products. Fifty-three isotopes located "north-east" 208Pb were identified as recoiling products formed non-fusion channels reaction. These recoils implanted energies two distinct...
A new isotope of Hs was produced in the reaction $^{208}\mathrm{Pb}(^{56}\mathrm{Fe},n)^{263}\mathrm{Hs}$ at 88-Inch Cyclotron Lawrence Berkeley National Laboratory. Six genetically correlated nuclear decay chains have been observed and assigned to $^{263}\mathrm{Hs}$. The measured cross section ${21}_{\ensuremath{-}8.4}^{+13}$ pb 276.4 MeV lab frame center-of-target beam energy. $^{263}\mathrm{Hs}$ decays with a half-life $0.{74}_{\ensuremath{-}0.21}^{+0.48}$ ms by...
Two isomeric states have been identified in $^{255}\mathrm{Lr}$. The decay of the isomers populates rotational structures. Comparison with macroscopic-microscopic calculations suggests that lowest observed sequence is built upon $[624]9/{2}^{+}$ Nilsson state. However, microscopic cranked relativistic Hartree-Bogoliubov (CRHB) do not reproduce moment inertia within typical accuracy. This a clear challenge to theories describing heaviest elements.
The new reaction $^{208}\mathrm{Pb}(^{59}\mathrm{Co},n)^{266}\mathrm{Mt}$ was studied using the Berkeley Gas-filled Separator at Lawrence National Laboratory 88-Inch Cyclotron. A cross section of ${7.7}_{\ensuremath{-}3.3}^{+5.2}$ pb measured a compound nucleus excitation energy 14.9 MeV. decay properties $^{266}\mathrm{Mt}$ and its daughters correspond well with existing data. We compare this experimental result to transactinide formation model predictions, previously...
An isomeric one-quasineutron state, likely based on the $[725]11/{2}^{\ensuremath{-}}$ Nilsson level, was identified in $^{261}\mathrm{Sg}$ by its decay via internal conversion electrons. The state has an excitation energy of $\ensuremath{\approx}200$ keV and a half-life $9.{0}_{\ensuremath{-}1.5}^{+2.0}$ $\ensuremath{\mu}$s. highest $Z$ $A$ any nucleus which electromagnetic observed to date. A separate experiment performed $\ensuremath{\alpha}$ daughter $^{261}\mathrm{Sg}$, namely...
In this article, the authors present a theoretical model for vibrational excitation of CO${}_{2}$, where virtual state and shape resonance doublet interact directly with each other also indirectly through electronic continuum as molecule bends. Based on $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ fixed-nuclei $R$-matrix calculations, parameters are determined using fitting procedure...