R. D. Page
A5079492153- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Advanced Chemical Physics Studies
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Radioactive Decay and Measurement Techniques
- Particle accelerators and beam dynamics
- Rare-earth and actinide compounds
- Radiation Detection and Scintillator Technologies
- Astro and Planetary Science
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Nuclear Materials and Properties
- X-ray Spectroscopy and Fluorescence Analysis
- Scientific Research and Discoveries
- Superconducting Materials and Applications
- Radiopharmaceutical Chemistry and Applications
University of Liverpool
2016-2025
Tri Alpha Energy (United States)
2021-2025
Centre National de la Recherche Scientifique
1995-2024
GSI Helmholtz Centre for Heavy Ion Research
2022-2024
Technical University of Darmstadt
2022-2024
Aix-Marseille Université
2024
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2024
Daresbury Laboratory
1992-2023
University of Surrey
2008-2023
University of Bristol
2022
A novel method of selecting \ensuremath{\gamma}-ray transitions in heavy nuclei (A>100) at the proton drip-line has been attempted. The characteristic charged-particle radioactivity these (alpha decay, ground-state and \ensuremath{\beta}-delayed emission) used to tag recorded by highly efficient Eurogam spectrometer. $^{58}\mathrm{Ni}$${+}^{54}$Fe $^{58}\mathrm{Ni}$${+}^{58}$Ni fusion-evaporation reactions, a beam energy 240 MeV, have populate specific states neutron-deficient results are...
A very exotic process of $\ensuremath{\beta}$-delayed fission $^{180}\mathrm{Tl}$ is studied in detail by using resonant laser ionization with subsequent mass separation at ISOLDE (CERN). In contrast to common expectations, the fission-fragment distribution post-$\ensuremath{\beta}$-decay daughter nucleus $^{180}\mathrm{Hg}$ ($N/Z=1.25$) asymmetric. This asymmetry more surprising since a mass-symmetric split this extremely neutron-deficient would lead two $^{90}\mathrm{Zr}$ fragments, magic...
Recoil decay tagging (RDT) is a very powerful method for the spectroscopy of exotic nuclei. RDT delayed coincidence technique between detectors usually at target position and focal plane spectrometer. Such measurements are often limited by dead time. This paper describes novel triggerless data acquisition method, which being developed Gamma Electron Alpha Tagging (GREAT) spectrometer, that overcomes this limitation virtually eliminating Our solution total readout (TDR) where all channels run...
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...
The \ensuremath{\alpha} decay characteristics of 88 lines emanating from 74 isotopes are presented, including new identified in the neutron deficient nuclides $^{158}\mathrm{Ta}$ (${\mathit{E}}_{\mathrm{\ensuremath{\alpha}}}$=5969\ifmmode\pm\else\textpm\fi{}8 keV, ${\mathit{t}}_{1/2}$=46\ifmmode\pm\else\textpm\fi{}4 ms), $^{159}\mathrm{Ta}$ (${\mathit{E}}_{\mathrm{\ensuremath{\alpha}}}$=5516\ifmmode\pm\else\textpm\fi{}5 ${\mathit{t}}_{1/2}$=1100\ifmmode\pm\else\textpm\fi{}100...
In-source resonant ionization laser spectroscopy of the even-$A$ polonium isotopes $^{192--210,216,218}\mathrm{Po}$ has been performed using $6{p}^{3}7s$ $^{5}S_{2}$ to $6{p}^{3}7p$ $^{5}P_{2}$ ($\ensuremath{\lambda}=843.38\text{ }\text{ }\mathrm{nm}$) transition in atom (Po-I) at CERN ISOLDE facility. The comparison measured isotope shifts $^{200--210}\mathrm{Po}$ with a previous data set allows us test for first time recent large-scale atomic calculations that are essential extract changes...
By studying the 109Xe-->105Te-->101Sn superallowed alpha-decay chain, we observe low-lying states in 101Sn, one-neutron system outside doubly magic 100Sn. We find that spins of ground state (J = 7=2) and first excited 5=2) 101Sn are reversed with respect to traditional level ordering postulated for 103Sn heavier tin isotopes. Through simple arguments state-of-the-art shell model calculations explain this unexpected switch terms a transition from single-particle regime collective mode which...
In recent experiments at the velocity filter Separator for Heavy Ion reaction Products (SHIP) (GSI, Darmstadt), an extended and improved set of α-decay data more than 20 most neutron-deficient isotopes in region from lead to thorium was obtained. The combined analysis this newly available data, which (186)Po decay is reported here, allowed us first time clearly show that crossing Z = 82 shell higher proton numbers strongly accelerates α decay. From experimental α-particle formation...
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...
TAE Technologies, Inc. (TAE) is pursuing an alternative approach to magnetically confined fusion, which relies on field-reversed configuration (FRC) plasmas composed of mostly energetic and well-confined particles by means a state-of-the-art tunable energy neutral-beam (NB) injector system. TAE's current experimental device, C-2W (also called 'Norman'), the world's largest compact-toroid device has made significant progress in FRC performance, producing record breaking, high temperature...
The new proton radioactivities ${}^{165,166,167}\mathrm{Ir}$ and ${}^{171}\mathrm{Au}$ have been observed. Ir isotopes were produced via the ${}^{92}\mathrm{Mo}{(}^{78}\mathrm{Kr}{,pxn)}^{165,166,167}\mathrm{Ir}$ reactions at 357 384 MeV. was ${}^{96}\mathrm{Ru}{(}^{78}\mathrm{Kr}{,p2n)}^{171}\mathrm{Au}$ reaction 389 emitters each identified by position, time, energy correlations between implantation of a residual nucleus into double-sided silicon strip detector, observation decay proton,...
An in-beam study of excited states in the transfermium nucleus 252No has been performed using recoil separator RITU together with JUROSPHERE II array at University Jyväskylä. This is second studied an experiment. Levels up to spin 20 were populated and compared levels 254No. upbend seen a frequency 200 keV/ħ corresponding 16. We also use improved systematics connect energy lowest 2+ state its half-life find that deformation both 252,254No slightly larger than previously assumed.Received July...
Two new alpha emitters 109Xe and 105Te were identified through the observation of --> 101Sn alpha-decay chain. The nuclei produced in fusion-evaporation reaction 54Fe(58Ni,3n)109Xe studied using Recoil Mass Spectrometer at Holifield Radioactive Ion Beam Facility. transitions Ealpha = 4062 +/- 7 keV 3918 9 interpreted as l 2 0 from 7/2+ ground state (T1/2 13 ms) to 5/2+ a excited state, located 150 105Te. subsequent decay marks discovery lightest known alpha-decaying nucleus. measured...
Isotope shifts have been measured for the odd-A polonium isotopes 191–211Po and changes in nuclear mean square charge radii δ〈r2〉 deduced. The measurements were performed at CERN-ISOLDE using in-source resonance-ionization spectroscopy technique. combined analysis of these data our recent results even-A indicates an onset deformation already 197,198Po, when going away from stability. This is significantly earlier than was suggested by previous theoretical experimental studies isotopes....
Hyperfine splitting parameters have been measured for the neutron-deficient odd-mass polonium isotopes and isomers $^{193--203}\mathrm{Po}$${}^{g,m}$, $^{209,211}\mathrm{Po}$. The measurement was performed at ISOLDE (CERN) online mass separator using in-source resonance ionization spectroscopy technique. magnetic dipole moments $\ensuremath{\mu}$ spectroscopic electric quadrupole ${Q}_{S}$ deduced. Their implication understanding of nuclear structure in vicinity closed proton shell $Z=82$...
We present the observation of an isomeric decay in very neutron deficient nucleus ${}_{36}^{74}\mathrm{Kr}.$ The isomer is interpreted as excited 0${}^{+}$ state, consistent with long standing prediction high deformation prolate/oblate shape coexistence this nucleus. magnitude $E0$ matrix element deduced for ${0}_{2}^{+}\ensuremath{\rightarrow}{0}_{1}^{+}$ transition gives strong support to a highly deformed oblate rotor.
Low-energy $\ensuremath{\beta}$-delayed fission of $^{194,196}\mathrm{At}$ and $^{200,202}\mathrm{Fr}$ was studied in detail at the mass separator ISOLDE CERN. The fission-fragment distributions daughter nuclei $^{194,196}\mathrm{Po}$ $^{202}\mathrm{Rn}$ indicate a triple-humped structure, marking transition between asymmetric $^{178,180}\mathrm{Hg}$ symmetric light Ra-Rn nuclei. Comparison with macroscopic-microscopic finite-range liquid-drop model self-consistent approach employing Gogny...
The detailed analysis of the β-delayed fission data 180Tl is presented. experiment was performed by producing a pure beam means highly selective resonance laser ionization followed mass separation with ISOLDE (CERN, Geneva) isotope separator. A surprising asymmetric distribution fragments from 180Hg, daughter β decays, observed. Here, energy calibration silicon detectors, which crucial for proper determination fragments' and split, presented total kinetic its dependence on split ratio...