T. Day Goodacre
A5038495593- Nuclear physics research studies
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Mass Spectrometry Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- Ion-surface interactions and analysis
- Laser Design and Applications
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Nuclear reactor physics and engineering
- Radioactive Decay and Measurement Techniques
- Radioactive element chemistry and processing
- Radiation Therapy and Dosimetry
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Analytical chemistry methods development
- High-Energy Particle Collisions Research
- Electrostatic Discharge in Electronics
European Organization for Nuclear Research
2015-2024
University of Manchester
2015-2024
TRIUMF
2018-2024
University of Victoria
2023-2024
Vancouver Biotech (Canada)
2018
At ISOLDE the majority of radioactive ion beams are produced using resonance ionization laser source (RILIS). This is based on resonant excitation atomic transitions by wavelength tunable radiation. Since its installation at facility in 1994, RILIS setup has been developed into a versatile remotely operated system comprising state-of–the-art solid state and dye lasers capable generating multiple high quality any range 210–950 nm. A continuous programme scheme development CERN other...
Neutrinos, and in particular their tiny but non-vanishing masses, can be considered one of the doors towards physics beyond Standard Model. Precision measurements kinematics weak interactions, 3H β-decay 163Ho electron capture (EC), represent only model independent approach to determine absolute scale neutrino masses. The experiment, ECHo, is designed reach sub-eV sensitivity on mass by means analysis calorimetrically measured spectrum nuclide 163Ho. maximum energy available for this decay,...
The mean-square charge radii of $^{207,208}\mathrm{Hg}$ ($Z=80$, $N=127$, 128) have been studied for the first time and those $^{202,203,206}\mathrm{Hg}$ ($N=122$, 123, 126) remeasured by application in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). characteristic kink in $N=126$ neutron shell closure has revealed, providing information on its behavior below $Z=82$ proton closure. A theoretical analysis performed within relativistic Hartree-Bogoliubov nonrelativistic...
We report on the measurement of ^{7}Be(n,p)^{7}Li cross section from thermal to approximately 325 keV neutron energy, performed in high-flux experimental area (EAR2) n_TOF facility at CERN. This reaction plays a key role lithium yield big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements this did not cover energy window interest BBN, and they showed large discrepancy between each other. was with Si telescope high-purity sample produced by...
The neutron-deficient Hg isotopes have been a paradigm for nuclear shape coexistence. ground states of these nuclei exhibit striking structural differences from the neighboring Pb isotopes, and are very challenging to study experimentally. Here, new state-of-the-art data extend information on charge radii (and electromagnetic moments) lightest ever measured using laser spectroscopy. results suggest sudden decrease in deformation an end region ground-state staggering. These provide...
Nuclear spins and precise values of the magnetic dipole electric quadrupole moments ground-states neutron-rich $^{76-78}$Cu isotopes were measured using Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE, CERN. The nuclear less exotic $^{73,75}$Cu re-measured with similar precision, yielding that are consistent earlier measurements. odd-odd isotopes, $^{78}_{29}$Cu ($N=49$) in particular, used to investigate excitations assumed doubly-magic $^{78}$Ni core through...
The neutron-rich isotopes $^{58-63}$Cr were produced for the first time at ISOLDE facility and their masses measured with ISOLTRAP spectrometer. new values are up to 300 times more precise than those in literature indicate significantly different nuclear structure from mass-surface trend. A gradual onset of deformation is found this proton neutron mid-shell region, which a gateway second island inversion around \emph{N}=40. In addition comparisons density-functional theory large-scale...
This article summarizes the current specifications and latest features of CERN-ISOLDE resonance ionization laser ion source (RILIS). includes a description optical layout newly designed reference system. The schemes for ionized beams at ISOLDE are tabulated, including six new elements. All RILIS also made publicly available in elements on-line database. Finally, we announce paradigm shift operation – combination machine protection monitoring control system has enabled on-call selected 2014...
Hyperfine-structure parameters and isotope shifts of $^{195--211}\mathrm{At}$ have been measured for the first time at CERN-ISOLDE, using in-source resonance-ionization spectroscopy method. The hyperfine structures isotopes were recorded a triad experimental techniques monitoring photo-ion current. Multi-Reflection Time-of-Flight Mass Spectrometer, in connection with high-resolution electron multiplier, was used as an ion-counting setup that either affected by strong isobaric contamination...
Abstract Nuclear charge radii globally scale with atomic mass number A as 1∕3 , and isotopes an odd of neutrons are usually slightly smaller in size than their even-neutron neighbours. This odd–even staggering, ubiquitous throughout the nuclear landscape 1 varies protons neutrons, poses a substantial challenge for theory 2–4 . Here, we report measurements short-lived copper up to very exotic 78 Cu (with proton Z = 29 neutron N 49), produced at only 20 ions s –1 using collinear resonance...
Hyperfine-structure constants for the $6s{\phantom{\rule{0.28em}{0ex}}}^{2}{S}_{1/2}$ and $6p{\phantom{\rule{0.28em}{0ex}}}^{2}{P}_{1/2}$ atomic states of ${I}^{\ensuremath{\pi}}=11/{2}^{\ensuremath{-}}$ gold isomers $^{177,191,193,195}\mathrm{Au}^{m}$ have been measured at CERN-ISOLDE, using in-source laser resonance-ionization spectroscopy technique. From hyperfine differences between anomalies these deduced. These differential anomaly values used to determine $6s$-state relative stable...
The hyperfine spectra of $^{51,53-64}$Mn were measured in two experimental runs using collinear laser spectroscopy at ISOLDE, CERN. Laser was performed on the atomic $3d^5\ 4s^2\ ^{6}\text{S}_{5/2}\rightarrow 3d^5\ 4s4p\ ^{6}\text{P}_{3/2}$ and ionic 4s\ ^{5}\text{S}_2 \rightarrow 4p\ ^{5}\text{P}_3$ transitions, yielding sets isotope shifts. mass field shift factors for both transitions have been calculated multiconfiguration Dirac-Fock framework combined with a King plot analysis order to...
Abstract The determination of the effective electron neutrino mass via kinematic analysis beta and capture spectra is considered to be model-independent since it relies on energy momentum conservation. At same time precise description expected spectrum goes beyond simple phase space term. In particular for processes, many-body electron-electron interactions lead additional structures besides main resonances in calorimetrically measured spectra. A $$^{163}$$ <mml:math...
For the first time, laser resonance photo-ionization technique has been applied inside a FEBIAD-type ion source at an ISOL facility. This was achieved by combining ISOLDE RILIS with variant of FEBIAD (the VADIS) in series off-line and on-line tests CERN. The immediate applications these developments include coupling molten targets introduction two new modes operation: element selective mode + VADIS for increased efficiency compared to operation alone. functionality demonstrated gallium...
The spectroscopic quadrupole moments of the odd–even Mn isotopes between N=28 and N=38 have been measured using bunched-beam collinear laser spectroscopy at ISOLDE, CERN. In order to increase sensitivity interaction, measurements done a transition in ion rather than atom, with additional advantage better efficiency. Since chosen is from metastable state, optical pumping ISOLDE's cooler buncher (ISCOOL) was used populate this state. extracted are compared large-scale shell model predictions...
The first accurate measurements of the α-decay branching ratio and half-life Iπ=1/2+ ground state in 181Tl have been made, along with determination magnetic moments I=1/2 spin assignments states 177,179Au. results are discussed within complementary systematics reduced widths nuclear g factors low-lying, neutron-deficient lead region. findings shed light on unexpected hindrance 1/2+→1/2+, 181Tl→g177Aug α decay, which is explained by a mixing π3s1/2 π2d3/2 configurations 177Aug, whilst 181Tlg...
The changes in mean-squared charge radii of neutron-deficient gold nuclei have been determined using the in-source, resonance-ionization laser spectroscopy technique, at ISOLDE facility (CERN). From these new data, nuclear deformations are inferred, revealing a competition between deformed and spherical configurations. isotopes ^{180,181,182}Au observed to possess well-deformed ground states and, when moving lighter masses, sudden transition near-spherical shapes is seen extremely nuclides,...
The neutron-rich radium isotopes, $^{222\ensuremath{-}233}\mathrm{Ra}$, were measured with Collinear Resonance Ionization Spectroscopy (CRIS) at the ISOLDE facility, CERN. hyperfine structure of $7{s}^{2}\phantom{\rule{0.16em}{0ex}}^{1}S_{0}\ensuremath{\rightarrow}7s7p\phantom{\rule{0.16em}{0ex}}^{3}P_{1}$ transition was probed, allowing measurement magnetic moments, quadrupole and changes in mean-square charge radii. These results are compared to existing literature values, new moments...
The first experimental investigation of the electron affinity (EA) a radioactive isotope has been conducted at CERN-ISOLDE ion beam facility. EA iodine 128I (t1/2 = 25 min) was determined to be 3.059 052(38) eV. experiment using newly developed Gothenburg ANion Detector for Affinity measurements by Laser PHotodetachment (GANDALPH) apparatus, connected beamline. produced in fission induced 1.4 GeV protons striking thorium/tantalum foil target and then extracted as singly charged negative ions...
The Collinear Resonance Ionisation Spectroscopy (CRIS) experiment at CERN has achieved high-resolution resonance ionisation laser spectroscopy with a full width half maximum linewidth of 20(1) MHz for 219,221Fr, and measured isotopes as short lived 5 ms 214Fr. This development allows greater precision in the study hyperfine structures isotope shifts, well higher selectivity single-isotope, even single-isomer, beams. These achievements are linked new laboratory data-acquisition systems.
Magnetic-dipole and electric-quadrupole moments for $^{65,67,69,75,79\text{--}82}\mathrm{Ga}$ are reported using the Collinear Resonance Ionization Spectroscopy (CRIS) technique at ISOLDE facility, CERN. The of $^{65}\mathrm{Ga}$ have been measured first time: $\ensuremath{\mu}=+1.775(3)\phantom{\rule{4pt}{0ex}}{\ensuremath{\mu}}_{\mathrm{N}}$ ${Q}_{s}=+21.0(15)\phantom{\rule{4pt}{0ex}}e\phantom{\rule{0.16em}{0ex}}{\mathrm{fm}}^{2}$. These results compared to shell-model calculations GXPF1...
Combined decay and laser spectroscopy measurements of the isotope $^{214}\mathrm{Fr}$ are reported, using collinear resonance ionization (CRIS) technique at ISOLDE facility CERN. For ${I}^{\ensuremath{\pi}}=({1}^{\ensuremath{-}})$ spin assignment, $g$-factor value $g(^{214}\mathrm{Fr})=+0.241(16)$ corresponds to a relatively pure $(\ensuremath{\pi}1{h}_{9/2}$ $\ensuremath{\bigotimes}$ $\ensuremath{\nu}2{g}_{9/2})$ ground-state configuration. An alternative interpretation with...