A5102788693- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Rare-earth and actinide compounds
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Boron Compounds in Chemistry
- Superconducting Materials and Applications
- Quantum, superfluid, helium dynamics
- Radiopharmaceutical Chemistry and Applications
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
Technical University of Darmstadt
2016-2025
University of Warsaw
2024
Goethe University Frankfurt
1994-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
1999-2024
National Centre for Nuclear Research
2024
Technical University of Munich
2006-2021
Chalmers University of Technology
2021
GSI Helmholtz Centre for Heavy Ion Research
1987-2020
Saha Institute of Nuclear Physics
2020
University of Jyväskylä
2019
Proton-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>γ</a:mi></a:math> coincidences from <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mo>(</b:mo><b:mi>d</b:mi><b:mo>,</b:mo><b:mi>p</b:mi><b:mo>)</b:mo></b:mrow></b:math> reactions between a <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mmultiscripts><c:mi>Ni</c:mi><c:mprescripts/><c:none/><c:mn>66</c:mn></c:mmultiscripts></c:math> beam and deuterated polyethylene target have been analyzed with the...
The Miniball germanium detector array has been operational at the REX (Radioactive ion beam EXperiment) post accelerator Isotope Separator On-Line facility ISOLDE CERN since 2001. During last decade, a series of successful Coulomb excitation and transfer reaction studies have performed with this array, utilizing unique high-quality radioactive beams which are available ISOLDE. In article, an overview is given technical details full setup, including description $\gamma$ -ray particle...
The "island of inversion" nucleus 32 Mg has been studied by a (t, p) two neutron transfer reaction in inverse kinematics at REX-ISOLDE. shape coexistent excited 0+ state identified the characteristic angular distribution protons Δ L=0 transfer. excitation energy 1058 keV is much lower than predicted any theoretical model. low γ-ray intensity observed for decay this indicates lifetime more 10 ns. Deduced spectroscopic amplitudes are compared with occupation numbers from shell-model calculations.
Abstract Neutrons are a valuable tool for non-destructive material investigation as their interaction cross sections with matter isotope sensitive and can be used complementary to x-rays. So far, most neutron applications have been limited large-scale facilities such nuclear research reactors, spallation sources, accelerator-driven sources. Here we show the design optimization of laser-driven source in epi-thermal thermal energy range, which is non-invasive analysis. Neutron resonance...
The very neutron-rich oxygen isotopes ${}^{25}$O and ${}^{26}$O are investigated experimentally theoretically. unbound states populated in an experiment performed at the R3B-LAND setup GSI via proton-knockout reactions from ${}^{26}$F ${}^{27}$F relativistic energies around 442 414 MeV/nucleon, respectively. From kinematically complete measurement of decay into ${}^{24}$O plus one or two neutrons, ground-state energy width determined, upper limits for lifetime extracted. In addition, results...
Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure stable and exotic oxygen isotopes at ${\mathrm{R}}^{3}\mathrm{B}/\mathrm{LAND}$ setup with incident beam energies range $300--450\text{ }\mathrm{MeV}/\mathrm{u}$. The isotopic chain offers large variation separation that allows quantitative understanding single-particle strength changing isospin asymmetry. provide complementary approach to intermediate-energy one-nucleon...
The neutron-rich nuclei 94,96Kr were studied via projectile Coulomb excitation at the REX-ISOLDE facility CERN. Level energies of first excited 2(+) states and their absolute E2 transition strengths to ground state are determined discussed in context E(2(1)(+)) B(E2;2(1)(+)→0(1)(+)) systematics krypton chain. Contrary previously published results no sudden onset deformation is observed. This experimental result supported by a new proton-neutron interacting boson model calculation based on...
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...
There is sparse direct experimental evidence that atomic nuclei can exhibit stable "pear" shapes arising from strong octupole correlations. In order to investigate the nature of collectivity in radium isotopes, electric (E3) matrix elements have been determined for transitions ^{222,228}Ra using method sub-barrier, multistep Coulomb excitation. Beams radioactive isotopes were provided by HIE-ISOLDE facility at CERN. The observed pattern E3 different nuclear explained describing ^{222}Ra as...
At the radioactive ion beam facility REX-ISOLDE, neutron-rich zinc isotopes were investigated using low-energy Coulomb excitation. These experiments have resulted in $B(E2,{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ values $^{74\ensuremath{-}80}\mathrm{Zn}$, $B(E2,{4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ $^{74,76}\mathrm{Zn}$ and determination of energy first excited ${2}_{1}^{+}$ states $^{78,80}\mathrm{Zn}$. The produced by high-energy proton- $(A=74,76,80)$ neutron- $(A=78)$...
A low-lying state in 131In82, the one-proton hole nucleus with respect to double magic 132Sn, was observed by its γ decay Iπ=1/2- β-emitting isomer. We identify new at an excitation energy of Ex=1353 keV, which populated both β 131Cd83 and after β-delayed neutron emission from 132Cd84, as previously unknown πp3/2 single-hole 132Sn core. Exploiting this crucial experimental information, shell-model calculations were performed study structure experimentally inaccessible N=82 isotones below...
In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at cold neutron beam facility PF1B Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements γ-rays following neutron-induced capture and fission reactions. The setup consisted collimation system producing pencil with thermal equivalent flux about 108 n s−1cm−2 target position negligible halo. surrounded by an eight ten anti-Compton shielded EXOGAM Clover...
Neutron-rich, radioactive Zn isotopes were investigated at the Radioactive Ion Beam facility REX-ISOLDE (CERN) using low-energy Coulomb excitation. The energy of 2(1)+ state in 78Zn could be firmly established and for first time 2+ --> 0(1)+ transition 80Zn was observed 1492(1) keV. B(E2,2(1)+ 0(1)+) values extracted (74,76,78,80)Zn compared to large scale shell model calculations. With only two protons outside Z=28 proton core, is lightest N=50 isotone which spectroscopic information has...
The 1789 keV state in 30Mg was identified as the first excited 0+ via its electric monopole (E0) transition to ground state. measured small value of rho2(E0,0(2)+-->0(1)+)=(26.2+/-7.5)x10(-3) implies within a two-level model mixing competing configurations with largely different intrinsic quadrupole deformation near neutron shell closure at N=20. Axially symmetric configuration calculations identify be based on below N=20 closure, while mainly consists two neutrons into nu 1f7/2 orbital....
Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is in the Zr and Sr isotopic chains at N = 60: Low-lying states N≤58 nearly spherical, while those N≥60 have rotational character. Nuclear lifetimes as short few picoseconds can be measured using fast-timing techniques LaBr3(Ce) scintillators, yielding key ingredient systematic study evolution this region. We used neutron-induced fission 241Pu 235U to excited...
We report on the first radioactive beam experiment performed at recently commissioned REX-ISOLDE facility CERN in conjunction with highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together a thin (nat)Ni target, Coulomb excitation excited 2+ states projectile and target nuclei well below barrier was observed. From measured relative deexcitation gamma-ray yields B(E2;0(+)gs-->2(+)1) value determined be 241(31)e2 fm4. Our result is lower than...
Lifetimes of prolate intruder states in Pb186 and oblate Po194 have been determined by employing, for the first time, recoil-decay tagging technique recoil distance Doppler-shift lifetime measurements. In addition, measurements Pb188 up to 8+ state were carried out using recoil-gating method. The B(E2) values deduced from which deformation parameters |β2|=0.29(5) |β2|=0.17(3) bands, respectively, extracted. results also shed new light on mixing between different shapes.Received 28 March...
Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of $^{70}\mathrm{Se}$ was postaccelerated to energy 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the target nuclei were deduced by recording deexcitation $\ensuremath{\gamma}$ rays highly segmented MINIBALL $\ensuremath{\gamma}$-ray spectrometer coincidence with scattered particles silicon detector. At these energies, yield first ${2}^{+}$ state is expected be strongly...
Lifetimes of yrast states in $^{180}\mathrm{Hg}$ up to the ${8}^{+}$ state and ${9}^{\ensuremath{-}}$ have been extracted from recoil-decay tagged $\ensuremath{\gamma}$-ray spectra by using recoil distance Doppler-shift method. In addition, lifetimes ${10}^{+}$ $^{182}\mathrm{Hg}$ recoil-gated $\ensuremath{\gamma}\ensuremath{\gamma}$-coincidence spectra. The present study addresses evolution collectivity two competing shapes neutron-deficient Hg nuclei as a function $A$ configuration mixing...