A5087729752- Nuclear physics research studies
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Mass Spectrometry Techniques and Applications
- Astronomical and nuclear sciences
- Atomic and Subatomic Physics Research
- Radioactive element chemistry and processing
- Advanced NMR Techniques and Applications
- Laser-induced spectroscopy and plasma
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Laser Design and Applications
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Radioactive Decay and Measurement Techniques
- Inorganic Fluorides and Related Compounds
- Spectroscopy and Laser Applications
- Magnetic confinement fusion research
- Pesticide Residue Analysis and Safety
- Machine Learning in Materials Science
- Diverse Scientific and Engineering Research
- Gas Dynamics and Kinetic Theory
University of Liverpool
2016-2025
University of Manchester
2006-2016
University of Birmingham
2003-2012
Collinear laser spectroscopy was performed on Ga (Z=31) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) used to extend measurements towards very neutron-rich (N=36-50). ground state (g.s.) spin I=1/2 is measured for 73Ga, being near degenerate with a 3/2{-} isomer (75 eV≲E{ex}≲1 keV). The 79Ga g.s., I=3/2, dominated by protons in the πf{5/2} orbital and 81Ga 5/2{-} level becomes g.s. data are compared shell-model calculations f{5/2}pg{9/2} model space, calling further...
We report the first confirmation of predicted inversion between pi2p3/2 and pi1f5/2 nuclear states in nu(g)9/2 midshell. This was achieved at ISOLDE facility, by using a combination in-source laser spectroscopy collinear on ground 71,73,75Cu, which measured spin magnetic moments. The obtained values are mu(71Cu)=+2.2747(8)mu(N), mu(73Cu)=+1.7426(8)mu(N), mu(75Cu)=+1.0062(13)mu(N) corresponding to spins I=3/2 for 71,73Cu I=5/2 75Cu. results fair agreement with large-scale shell-model calculations.
In the last decade there has been a renaissance in laser spectroscopy at on-line facilities. This included introduction of ion traps and use sources to study hyperfine structure exotic nuclei far from stability produce selective enhancement isomeric beams. In-source allowed rare isotopes with yields as low 0.1 atoms per second. case high-resolution spectroscopy, cooling trapping ions dramatically improved sensitivity. Some elements that were previously inaccessible are now available for...
The change in mean-square nuclear charge radii δ⟨r2⟩ along the even-A tin isotopic chain 108−134Sn has been investigated by means of collinear laser spectroscopy at ISOLDE/CERN using atomic transitions 5p2 1S0→5p6 s1P1 and 3P0→5p6s 3P1. With determination radius 134Sn corrected values for some neutron-rich isotopes, evolution across N=82 shell closure is established. A clear kink doubly magic 132Sn revealed, similar to what observed other chains with larger proton numbers, N=126 208Pb. While...
Collinear laser spectroscopy is performed on the nickel isotopes ^{58-68,70}Ni, using a time-resolved photon counting system. From measured isotope shifts, nuclear charge radii R_{c} are extracted and compared to theoretical results. Three ab initio approaches all employ, among others, chiral interaction NNLO_{sat}, which allows an assessment of their accuracy. We find agreement with experiment in differential δ⟨r_{c}^{2}⟩ for employed methods interactions, while absolute consistent data...
A gas-filled segmented linear Paul trap has been installed at the focal plane of high-resolution separator (HRS) CERN-ISOLDE. As well as providing beams with a reduced transverse emittance, this device is also able to accumulate ions and release sample in bunches well-defined time structure. This recently permitted collinear laser spectroscopy stable radioactive bunched be demonstrated ISOLDE. Surface-ionized 39, 44, 46K 85Rb were accelerated 30keV, mass separated injected into for...
A new method of optical pumping in an ion beam cooler buncher has been developed to selectively enhance ionic metastable state populations. The technique permits the study elements previously inaccessible laser spectroscopy and applied here Nb. Model independent mean-square charge radii nuclear moments have studied for ;{90,90 m,91,91 m,92,93,99,101,103}Nb cover region N=50 shell closure N approximately 60 sudden onset deformation. increase radius is observed be less than that Y, with a...
Measurements of the ground-state nuclear spins and magnetic quadrupole moments copper isotopes from $^{61}\mathrm{Cu}$ up to $^{75}\mathrm{Cu}$ are reported. The experiments were performed at CERN online isotope mass separator (ISOLDE) facility, using technique collinear laser spectroscopy. trend in between $N=28$ $N=50$ shell closures is reasonably reproduced by large-scale shell-model calculations starting a $^{56}\mathrm{Ni}$ core. reveal strong polarization underlying Ni core when...
Over three and a half decades of collinear laser spectroscopy the COLLAPS setup have played major role in ISOLDE physics programme. Based on general experimental principle diverse approaches towards higher sensitivity, it has provided unique access to basic nuclear properties such as spins, magnetic moments electric quadrupole well isotopic variations mean square charge radii. While previous methods outstanding sensitivity were restricted selected chemical elements with special atomic or...
Until recently, ground-state nuclear moments of the heaviest nuclei could only be inferred from spectroscopy, where model assumptions are required. Laser spectroscopy in combination with modern atomic structure calculations is now able to probe these directly, a comprehensive and nuclear-model-independent way. Here we report on unique access differential mean-square charge radii ^{252,253,254}No, therefore changes size shape. State-of-the-art density functional describe well region heavy...
Differences in mean-square nuclear charge radii of $^{100--130}\mathrm{Cd}$ are extracted from high-resolution collinear laser spectroscopy the $5s\text{ }{^{2}S}_{1/2}\ensuremath{\rightarrow}5p\text{ }{^{2}P}_{3/2}$ transition ion and $5s5p\text{ }{^{3}P}_{2}\ensuremath{\rightarrow}5s6s\text{ }{^{3}S}_{1}$ atomic Cd. The show a smooth parabolic behavior on top linear trend regular odd-even staggering across almost complete $sdgh$ shell. They serve as first test for recently established new...
One of the most important atomic properties governing an element's chemical behavior is energy required to remove its least-bound electron, referred as first ionization potential. For heaviest elements, this fundamental quantity strongly influenced by relativistic effects which lead unique properties. Laser spectroscopy on atom-at-a-time scale was developed and applied probe optical spectrum neutral nobelium near threshold. The potential determined here with a very high precision from...
Radioisotopes of molybdenum have been studied using laser spectroscopy techniques at the IGISOL facility, University Jyväskylä. Differences in nuclear charge radii determined for neutron deficient isotopes 90,91Mo and rich 102–106,108Mo (and all stable isotopes). A smooth transition mean square is observed as number increases with no sudden shape change region around N=60. As N increases, deformation appears to go beyond a maximum fall off N=66 observed. The magnetic moments odd 91,103,105Mo...
Nuclear mean-square charge radii of radioactive isotopes are obtained from isotope-shift measurements using laser spectroscopy. To extract the values $\ensuremath{\delta}\ensuremath{\langle}{r}^{2}\ensuremath{\rangle}$ atomic field and mass shift factors need to be evaluated. We here summarize currently available experimental theoretical techniques for calculating complex, open-shell atoms, including...
Collinear laser spectroscopy is performed on the _{30}^{79}Zn_{49} isotope at ISOLDE-CERN. The existence of a long-lived isomer with few hundred milliseconds half-life confirmed, and nuclear spins moments ground isomeric states in ^{79}Zn as well shift are measured. From observed hyperfine structures, I=9/2 I=1/2 firmly assigned to states. magnetic moment μ (^{79}Zn)=-1.1866(10)μ_{N}, confirms spin-parity 9/2^{+} νg_{9/2}^{-1} shell-model configuration, excellent agreement prediction from...
The first optical study of the N=28 shell closure in manganese is reported. Mean-square charge radii and quadrupole moments, obtained for ground isomeric states 50–56Mn, are extracted using new calculations atomic factors. show a well defined at magic number. behaviour strikingly different to that neutron separation energies where no effect can be observed. nuclear parameters successfully described by large scale model GXPF1A interaction.
Collinear laser spectroscopy experiments with the Sc + transition 3d4s 3 D 2 → 3d4p F at λ = 363.1 nm were performed on 42-46 isotopic chain using an ion guide isotope separator a cooler-buncher.Nuclear magnetic dipole and electric quadrupole moments as well shifts determined from hyperfine structure for five ground states two isomers.Extensive multiconfigurational Dirac-Fock calculations in order to evaluate specific mass-shift, M SMS , field-shift, F, parameters which allowed evaluation of...
Collinear laser spectroscopy on $^{58--75}\mathrm{Cu}$ isotopes was performed at the CERN-ISOLDE radioactive ion beam facility. In this paper we report isotope shifts obtained from these measurements. State-of-the-art atomic physics calculations have been undertaken in order to determine changes mean-square charge radii $\ensuremath{\delta}{\ensuremath{\langle}{r}^{2}\ensuremath{\rangle}}^{A,{A}^{\ensuremath{'}}}$ observed shifts. A local minimum is differences $N=40$, providing evidence for...
We present the first laser spectroscopic measurement of neutron-rich nucleus ^{68}Ni at N=40 subshell closure and extract its nuclear charge radius. Since this is only short-lived isotope for which dipole polarizability α_{D} has been measured, combination these observables provides a benchmark structure theory. compare them to novel coupled-cluster calculations based on different chiral two- three-nucleon interactions, strong correlation between radius observed, similar stable ^{48}Ca....
Abstract Tin is the chemical element with largest number of stable isotopes. Its complete proton shell, comparable closed electron shells in chemically inert noble gases, not a mere precursor to extended stability; since protons carry nuclear charge, their spatial arrangement also drives electromagnetism. We report high-precision measurements electromagnetic moments and isomeric differences charge radii between lowest 1/2 + , 3/2 11/2 − states 117–131 Sn, obtained by collinear laser...
Abstract Understanding the evolution of nuclear charge radius is one long-standing challenges for theory. Recently, density functional theory calculations utilizing Fayans functionals have successfully reproduced radii a variety exotic isotopes. However, difficulties in isotope production hindered testing these models immediate region chart below heaviest self-conjugate doubly-magic nucleus 100 Sn, where near-equal number protons ( Z ) and neutrons N lead to enhanced neutron-proton pairing....
The impact of nuclear deformation can been seen in the systematics charge radii, with radii generally expanding increasing deformation. In this Letter, we present a detailed analysis precise relationship between quadrupole and size. Our approach combines first measurements changes mean-square well-deformed palladium isotopes A=98 A=118 density functional calculations using Fayans functionals, specifically Fy(std) Fy(Δr,HFB), UNEDF2 functional. are extracted from collinear laser spectroscopy...
We report on the masses and hyperfine structure of ground isomeric states in 114,116,118,120Ag isotopes, measured with phase-imaging ion-cyclotron-resonance technique (PI-ICR) JYFLTRAP mass spectrometer collinear laser spectroscopy beamline at Ion Guide Isotope Separator On-Line facility, Jyväskylä, Finland. excitation energies, electromagnetic moments, charge radii, firmly established nuclear spins long-lived states. A new isomer was discovered 118Ag half-lives were reevaluated....