A5081827797- Nuclear physics research studies
- Nuclear Physics and Applications
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Nuclear reactor physics and engineering
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Advanced Data Storage Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Scientific Computing and Data Management
- Distributed and Parallel Computing Systems
- Neutrino Physics Research
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiopharmaceutical Chemistry and Applications
GSI Helmholtz Centre for Heavy Ion Research
2016-2025
Helmholtz Institute Mainz
2025
Johannes Gutenberg University Mainz
2025
University of Cologne
2024
Saha Institute of Nuclear Physics
2024
RIKEN Nishina Center
2016-2022
VNU University of Science
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2021
Institut National de Physique Nucléaire et de Physique des Particules
2018-2020
Centre National de la Recherche Scientifique
2011-2020
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 half-lives of 20 neutron-rich nuclei with Z=27-30 have been measured at the RIBF, including five new (76)Co(21.7(-4.9)(+6.5) ms), (77)Co(13.0(-4.3)(+7.2) (79)Ni(43.0(-7.5)(+8.6) (80)Ni(23.9(-17.2)(+26.0) and (81)Cu(73.2 ± 6.8 ms). In addition, (73-75)Co, (74-78)Ni, (78-80)Cu, (80-82)Zn were determined higher precision than previous works. Based on these results, a systematic study β-decay has carried out, which suggests sizable magicity for both proton number Z = 28 neutron N=50 in (78)Ni.
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...
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...
Neutron-induced reaction cross sections of short-lived nuclei are imperative to understand the origin heavy elements in stellar nucleosynthesis and for societal applications, but their measurement is extremely complicated due radioactivity targets involved. One way overcoming this issue combine surrogate reactions with unique possibilities offered by heavy-ion storage rings. In work, we describe first surrogate-reaction experiment inverse kinematics, which successfully conducted at...
The probabilities for γ-ray and particle emission as a function of the excitation energy decaying nucleus are valuable observables constraining ingredients models that describe deexcitation nuclei near threshold. These essential in nuclear astrophysics applications. In this paper, we have first time simultaneously measured neutron <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Pb</a:mi><a:mprescripts/><a:none/><a:mn>208</a:mn></a:mmultiscripts></a:math>....
The ratio ${R}_{\ensuremath{\nu}}$ of the neutral- to charged-current cross sections neutrinos in iron has been measured an exposure CERN-Dortmund-Heidelberg-Saclay neutrino detector a 160-GeV/c narrow-band beam at CERN Super Proton Synchrotron. result is ${R}_{\ensuremath{\nu}}=0.3072\ifmmode\pm\else\textpm\fi{}0.0025(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0020(\mathrm{syst})$, for hadronic energy greater than 10 GeV. electroweak mixing parameter...
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...
Delayed γ-ray cascades, originating from the decay of (6⁺) isomeric states, in very neutron-rich, semimagic isotopes (136,138)Sn have been observed following projectile fission a ²³⁸U beam at RIBF, RIKEN. The wave functions these states are proposed to be predominantly fully aligned pair f(7/2) neutrons. Shell-model calculations, performed using realistic effective interaction, reproduce well energies excited nuclei and measured transition rates, with exception B(E2;6⁺→4⁺) rate ¹³⁶Sn, which...
The level structures of the very neutron-rich nuclei 128Pd and 126Pd have been investigated for first time. In r-process waiting-point nucleus 128Pd, a new isomer with half-life 5.8(8) μs is proposed to spin parity 8(+) associated maximally aligned configuration arising from g(9/2) proton subshell seniority υ=2. For 126Pd, two isomers identified half-lives 0.33(4) 0.44(3) μs. yrast 2(+) energy much higher in than while sequence below similar that N=82 isotone 130Cd. electric quadrupole...
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...
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.''