A5005141557- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- High-Energy Particle Collisions Research
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Detector Development and Performance
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Astro and Planetary Science
- Nuclear Materials and Properties
- Radiation Therapy and Dosimetry
- Advanced Frequency and Time Standards
- Cold Fusion and Nuclear Reactions
- Gamma-ray bursts and supernovae
- Radioactive Decay and Measurement Techniques
- Superconducting Materials and Applications
GSI Helmholtz Centre for Heavy Ion Research
2015-2024
University of Cologne
2007-2024
National Centre for Nuclear Research
2015-2024
University of Warsaw
2024
Saha Institute of Nuclear Physics
2024
University of Edinburgh
2024
University of Groningen
2013-2023
Justus-Liebig-Universität Gießen
2016-2023
University of the West of Scotland
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2021
With a new detector setup and the high-resolution performance of fragment separator FRS at GSI we discovered 57 isotopes in atomic number range 60$\leq Z \leq 78$: \nuc{159-161}{Nb}, \nuc{160-163}{Pm}, \nuc{163-166}Sm, \nuc{167-168}{Eu}, \nuc{167-171}{Gd}, \nuc{169-171}{Tb}, \nuc{171-174}{Dy}, \nuc{173-176}{Ho}, \nuc{176-178}{Er}, \nuc{178-181}{Tm}, \nuc{183-185}{Yb}, \nuc{187-188}{Lu}, \nuc{191}{Hf}, \nuc{193-194}{Ta}, \nuc{196-197}{W}, \nuc{199-200}{Re}, \nuc{201-203}{Os},...
Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV 20882Pb beam. Secondary fragments separated and identified subsequently implanted in passive stopper. By detection delayed γ rays, isomeric decays associated with these have been identified. A total 49 isomers detected, majority them observed for first time. The newly discovered are 204,20580Hg, 201,202,204,20579Au, 197,203,20478Pt, 195,199−20377Ir, 193,197−19976Os, 19675Re, 190,19174W, 18973Ta. Possible level...
Proton radii of ^{12-19}C densities derived from first accurate charge changing cross section measurements at 900A MeV with a carbon target are reported. A thick neutron surface evolves ∼0.5 fm in ^{15}C to ∼1 ^{19}C. The halo radius ^{19}C is found be 6.4±0.7 as large ^{11}Li. Ab initio calculations based on chiral nucleon-nucleon and three-nucleon forces reproduce the well.
The $\ensuremath{\gamma}$ decay of excited states in the waiting-point nucleus $^{130}\mathrm{Cd}_{82}$ has been observed for first time. An ${8}^{+}$ two-quasiparticle isomer populated both fragmentation a $^{136}\mathrm{Xe}$ beam as well projectile fission $^{238}\mathrm{U}$, making $^{130}\mathrm{Cd}$ most neutron-rich $N=82$ isotone which information about is available. results, interpreted using state-of-the-art nuclear shell-model calculations, show no evidence an shell quenching at...
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...
Precise measurements of the lifetimes first excited 2+ states in stable even-A Sn isotopes 112–124Sn have been performed using Doppler shift attenuation technique. For 112Sn, 114Sn and 116Sn E2 transition strengths deduced from measured are disagreement with previously reported values indicate a shallow minimum at N=66. The observed deviation maximum mid-shell is attributed to obstructive effect s1/2 neutron orbital generating collectivity when near Fermi level.
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 first determination of radii point proton distribution (proton radii) 12–17B from charge-changing cross sections (σCC) measurements at the FRS, GSI, Darmstadt is reported. are deduced a finite-range Glauber model analysis σCC. show an increase 13B to 17B and consistent with predictions antisymmetrized molecular dynamics for neutron-rich nuclei. existence thick neutron surface neutron-proton radius difference 0.51(0.11) fm in 17B.Received 11 May...
Measurements of the beta-decay half-lives neutron-rich nuclei (MgAr) in vicinity N=28 shell closure are reported. Some 22 have been determined, 12 which for first time. Particular emphasis is placed on results Si isotopes, extended from N=25 to 28. Comparison with QRPA calculations suggests that 42Si strongly deformed. This discussed light a possible weakening spin–orbit potential.
The low-lying structure of $^{188,190,192}\mathrm{W}$ has been studied following $\ensuremath{\beta}$ decays the neutron-rich mother nuclei $^{188,190,192}\mathrm{Ta}$ produced projectile fragmentation a 1-GeV-per-nucleon $^{208}\mathrm{Pb}$ primary beam on natural beryllium target at GSI Fragment Separator. $\ensuremath{\beta}$-decay half-lives $^{188}\mathrm{Ta}$, $^{190}\mathrm{Ta}$, and $^{192}\mathrm{Ta}$ have measured, with $\ensuremath{\gamma}$-ray states in their respective W...
The four proton-hole nucleus 204Pt was populated in the fragmentation of an E/A=1 GeV 208Pb beam. yrast structure has been observed up to angular momentum I=10ℏ by detecting delayed γ-ray transitions originating from metastable states. These long-lived excited states have identified spin-parities Iπ=(10+), (7−), and (5−) half-lives T1/2=146(14)ns, 55(3)μs, 5.5(7)μs, respectively. magic N=126 is discussed understood terms spherical shell model. data suggest a revision two-body interaction for...
A measurement of the reduced transition probability for excitation ground state to first ${2}^{+}$ in $^{104}\mathrm{Sn}$ has been performed using relativistic Coulomb at GSI. is lightest isotope Sn chain which this quantity measured. The result a key point discussion evolution nuclear structure proximity doubly magic nucleus $^{100}\mathrm{Sn}$. value $B(E2;{0}^{+}\ensuremath{\rightarrow}{2}^{+})=0.10(4)$ ${e}^{2}{b}^{2}$ significantly lower than earlier results $^{106}\mathrm{Sn}$ and...
The neutron-rich lead isotopes, up to $^{216}\mathrm{Pb}$, have been studied for the first time, exploiting fragmentation of a primary uranium beam at FRS-RISING setup GSI. observed isomeric states exhibit electromagnetic transition strengths which deviate from state-of-the-art shell-model calculations. It is shown that their complete description demands introduction effective three-body interactions and two-body operators in conventional neutron valence space beyond $^{208}\mathrm{Pb}$.
The $\beta$-delayed neutron emission probabilities of rich Hg and Tl nuclei have been measured together with $\beta$-decay half-lives for 20 isotopes Au, Hg, Tl, Pb Bi in the mass region N$\gtrsim$126. These are heaviest species where has observed so far. measurements provide key information to evaluate performance nuclear microscopic phenomenological models reproducing high-energy part strength distribution. In doing so, it provides important constraints global theoretical currently used...
Mass measurements of fission and projectile fragments, produced via $^{238}\mathrm{U}$ $^{124}\mathrm{Xe}$ primary beams, have been performed with the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) Fragment Separator (FRS) Ion Catcher a resolving power (FWHM) up to 410 000 an uncertainty down $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$. The nuclides were separated in flight fragment separator FRS at 300 1000 MeV/u thermalized cryogenic stopping cell....
SOFIA (Studies On Fission with Aladin) is a novel experimental program, dedicated to accurate measurements of fission-fragment isotopic yields. The setup allows us fully identify, in nuclear charge and mass, both fission fragments coincidence for the whole range. It was installed at GSI facility (Darmstadt), benefit from relativistic heavy-ion beams available there, thus use inverse kinematics. This paper reports on yields obtained electromagnetically induced $^{238}\mathrm{U}$.
Excitation spectra of $^{11}\mathrm{C}$ are measured in the $^{12}\mathrm{C}(p,d)$ reaction near ${\ensuremath{\eta}}^{\ensuremath{'}}$ emission threshold. A proton beam extracted from synchrotron SIS-18 at GSI with an incident energy 2.5 GeV impinges on a carbon target. The momenta deuterons emitted 0\ifmmode^\circ\else\textdegree\fi{} precisely fragment separator (FRS) operated as spectrometer. In contrast to theoretical predictions possible existence deeply bound...
The inverse kinematics technique, applied to radioactive beams and combined the Coulomb excitation method, is a powerful tool study low-energy fission. A novel experimental setup was developed within R3B/SOFIA (Reactions with Relativistic Radioactive Beams/Studies On FIssion Aladin) collaboration identify in mass atomic numbers both fission fragments coincidence. These new data provide elemental, isobaric, isotonic yields for along thorium isotopic chain. Results are also compared previous...
Mass measurements of the $^{69}$As, $^{70,71}$Se and $^{71}$Br isotopes, produced via fragmentation a $^{124}$Xe primary beam at FRS GSI, have been performed with multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) Ion Catcher an unprecedented resolving power almost 1,000,000. For $^{69}$As isotope, this is first direct measurement. A uncertainty 22 keV was achieved only 10 events. $^{70}$Se 2.6 obtained, corresponding to relative accuracy $\delta$m/m = 4.0$\times 10^{-8}$, less...
A β-decaying high-spin isomer in (96)Cd, with a half-life T(1/2)=0.29(-0.10)(+0.11) s, has been established stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of primary (124)Xe on (9)Be target. From and observed γ decays daughter nucleus, (96)Ag, we conclude that state is long predicted 16(+) "spin-gap" isomer. Shell-model calculations, Gross-Frenkel interaction πν(p(1/2),g(9/2)) model space, show isoscalar...
This Letter reports on a systematic study of β-decay half-lives neutron-rich nuclei around doubly magic Pb208. The lifetimes the 126-neutron shell isotone Pt204 and neighboring Ir200–202, Pt203, Au204 are presented together with other 19 measured during "stopped beam" campaign rare isotope investigations at GSI collaboration. results constrain main nuclear theories used in calculations r-process nucleosynthesis. Predictions based statistical macroscopic description first-forbidden β strength...