K. Wrzosek-Lipska
A5034052699- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Radiation Effects in Electronics
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Rare-earth and actinide compounds
- Advanced NMR Techniques and Applications
- Particle Detector Development and Performance
- Muon and positron interactions and applications
- Magnetic Properties of Alloys
- Astro and Planetary Science
- Ion-surface interactions and analysis
- Calibration and Measurement Techniques
- Radiation Therapy and Dosimetry
- Scientific Research and Discoveries
University of Warsaw
2013-2025
KU Leuven
2013-2016
Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with $2.85\text{ }\mathrm{MeV}/\mathrm{nucleon}\text{ }\mathrm{mercury}$ beams from REX-ISOLDE. Magnitudes and relative signs the reduced $E2$ matrix elements that couple ground state low-lying excited states in $^{182\ensuremath{-}188}\mathrm{Hg}$ extracted. Information on deformation first ${0}^{+}$ was deduced using quadrupole sum rules approach. Results show is slightly...
Lead-208 is the heaviest known doubly magic nucleus and its structure therefore of special interest. Despite this magicity, which acts to provide a strong restorative force toward sphericity, it exhibit both octupole correlations some strongest quadrupole collectivity observed in systems. In Letter, we employ state-of-the-art experimental equipment conclusively demonstrate, through four Coulomb-excitation measurements, presence large, negative, spectroscopic moment for vibrational <a:math...
The neutron-deficient mercury isotopes, $^{184,186}$Hg, were studied with the Recoil Distance Doppler Shift (RDDS) method using Gammasphere array and K\"oln Plunger device. Differential Decay Curve Method (DDCM) was employed to determine lifetimes of yrast states in $^{184,186}$Hg. An improvement on previously measured values up $8^{+}$ is presented as well first for $9_{3}$ state $^{184}$Hg $10^{+}$ $^{186}$Hg. $B(E2)$ are calculated compared a two-state mixing model which utilizes variable...
The structure of neutron-rich $^{96,98}\mathrm{Sr}$ nuclei was investigated by low-energy safe Coulomb excitation radioactive beams at the REX-ISOLDE facility, CERN, with MINIBALL spectrometer. A rich set transitional and diagonal $E2$ matrix elements, including those for non-yrast structures, has been extracted from differential Coulomb-excitation cross sections. results support scenario a shape transition $N=60$, giving rise to coexistence highly deformed prolate spherical configuration in...
Besides the level scheme, absolute transition strengths between excited states yield fundamental information on nuclear structure and can be determined from lifetimes. The recoil distance Doppler-shift (RDDS) technique is very valuable for measurement of lifetimes in picosecond range. During last years, our group constructed several compact plunger devices RDDS experiments with \(\gamma \)-ray spectrometers coupled to charged particle detector arrays situated target chamber, dedicated setups...
The integration of the modernized Recoil Filter Detector with EAGLE gamma-ray spectrometer at Heavy Ion Laboratory University Warsaw (HIL UW) offers new opportunities to advance spectroscopic studies deformed medium-mass nuclei high spins. This setup is designed improve sensitivity gamma rays energies, which are typically subject significant Doppler broadening due recoil velocities emitting nuclei. Additionally, upgraded system will enable investigation shape transitions in octupole-deformed...
A campaign of Coulomb-excitation experiments to study the electromagnetic structure \(^{110}\)Cd was performed using beams \(^{14}\)N, \(^{32}\)S, and \(^{60}\)Ni. The use various reaction partners enables disentangling contributions individual matrix elements involved in excitation process, yielding, among others, a precise determination lifetime 2\(^+_2\) state \(^{110}\)Cd. Abstract Published by Jagiellonian University 2025 authors
Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient $^{196,198,200,202}\mathrm{Po}$ isotopes at the REX-ISOLDE facility. A set matrix elements, coupling low-lying states in these isotopes, is extracted. In two heaviest $^{200,202}\mathrm{Po}$, transitional and diagonal elements ${2}_{1}^{+}$ state determined. $^{196,198}\mathrm{Po}$ multistep Coulomb excitation observed, populating ${4}_{1}^{+},\phantom{\rule{0.28em}{0ex}}{0}_{2}^{+}$, ${2}_{2}^{+}$...
Neutron-deficient isotopes of Pt–Hg–Pb–Po–Rn are the classic region in investigation shape coexistence atomic nuclei. A large programme Coulomb-excitation experiments has been undertaken at REX-ISOLDE facility CERN with a number even–even this region. These have used to probe electromagnetic properties yrast and non-yrast states exotic nuclei, above below Z = 82. Amongst amount different complementary techniques study nuclear structure, Coulomb excitation brings substantial unique...
The neutron-deficient mercury isotopes serve as a classical example of shape coexistence, whereby at low energy near-degenerate nuclear states characterized by different shapes appear. electromagnetic structure even-mass 182-188 Hg was studied using safe-energy Coulomb excitation beams delivered the REX-ISOLDE facility CERN. population $ 0^{+}_{1,2}$, 2^{+}_{1,2}$ and 4^{+}_{1}$ observed in all nuclei under study. Reduced E2 matrix elements coupling populated yrast non-yrast were extracted,...
Nuclear shell evolution in neutron-rich Na nuclei around $N=20$ was studied by determining reduced transition probabilities, i.e., $B(E2)$ and $B(M1)$ values, order to map the border of island inversion. To this end Coulomb-excitation experiments, employing radioactive ${}^{29,30}$Na beams with a final beam energy 2.85 $\mathrm{M}$$\mathrm{e}\mathrm{V}$/nucleon, were performed at REX-ISOLDE, CERN. De-excitation $\ensuremath{\gamma}$ rays detected MINIBALL $\ensuremath{\gamma}$-ray...
There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape pear. This phenomenon important for measurements electric-dipole moments atoms, which would indicate CP violation hence probe physics beyond Standard Model particle physics. Isotopes both radon radium have been identified as candidates such measurements. Here, we observed low-lying quantum states in 224Rn 226Rn by accelerating beams these radioactive nuclei. We show isotopes vibrations...
Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close the ground state. A classic region for investigating this phenomenon is around $Z=82$ and neutron mid-shell at $N=104$. Purpose: Evidence has been inferred from $\alpha$-decay measurements, laser spectroscopy in-beam measurements. While latter allow pattern of excited states rotational band structures be mapped out, detailed...
The first experiment using radioactive beams post-accelerated by the HIE-ISOLDE facility has enabled to obtain a precise set of $B(E2)$ transition probabilities in neutron-rich $^{74,76}\mathrm{Zn}$ isotopes. resulting $B(E2$; ${2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+}$) values are consistent with those determined earlier REX-ISOLDE measurements. While ${4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+}$) probability $^{76}\mathrm{Zn}$ is also agreement Coulomb-excitation results, value...
The excited states of $^{148}\mathrm{Ho}$ and $^{149}\mathrm{Ho}$ isotopes are studied using $\ensuremath{\gamma}$-ray electron spectroscopy in off-beam in-beam modes following $^{112,114}\mathrm{Sn}$($^{40}\mathrm{Ar}$,$\mathit{xnyp}$) reactions. Experiments include measurements single $\ensuremath{\gamma}$-rays conversion spectra as well $\ensuremath{\gamma}$-$\ensuremath{\gamma}$, electron-$\ensuremath{\gamma}$, $\ensuremath{\gamma}\ensuremath{-}t$,...
The quadrupole shape evolution in heaviest stable Mo isotopes is studied terms of the coexistence phenomenon occurrence this region nuclear chart. Quadrupole deformation parameters 96,98,100 low-lying (ground and excited) 0 + states were deduced using Coulomb excitation method. In all cases rich sets electromagnetic reduced matrix elements determined GOSIA code then analysed Sum Rules formalism. Discussion experimental results comparison with predictions microscopic calculations within...
The Coulomb excitation experiment to study electromagnetic structure of low-lying states in Ca-42 with a focus on possible superdeformation this nucleus was performed at the Laboratori Naziona ...
In the present study, B(E2; 2+ → 0+) values have been measured in 208Rn and 206Po nuclei through Coulomb excitation of re-accelerated radioactive beams inverse kinematics at CERN-ISOLDE. The resulting is ∼ 0.08 e2b2. These lie in, or boundary region where seniority scheme should persist. However, contributions from collective excitations may be when moving away N = 126 shell closure. To date, surprisingly little known transition probabilities between low-spin states this region.
A rapid onset of quadrupole deformation is known to occur around the neutron number 60 in neutron-rich Zr and Sr isotopes. This shape change has made = 100 region an active area experimental theoretical studies for many decades now. We report this contribution new results rich 96,98Sr investigated by safe Coulomb excitation radioactive beams at REX-ISOLDE facility, CERN. Reduced transition probabilities spectroscopic moments have been extracted from differential cross section supporting...
The IS475 collaboration conducted Coulomb-excitation experiments with postaccelerated radioactive 220Rn and 224Ra beams at the REX-ISOLDE facility. beam particles (Ebeam ≈ 2.83 MeV/u) were Coulomb excited using 60Ni, 114Cd, 120Sn scattering targets. De-excitation γ-rays detected employing Miniball array scattered in a silicon detector. Exploiting code GOSIA for each nucleus several matrix elements could be obtained from measured γ-ray yields. extracted ⟨3−||Ê3||0+⟩ element allows conclusion...