A5024352532- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Astronomical and nuclear sciences
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Radioactive Decay and Measurement Techniques
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Rare-earth and actinide compounds
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Radiopharmaceutical Chemistry and Applications
- Nuclear Materials and Properties
- Particle Detector Development and Performance
- Mass Spectrometry Techniques and Applications
- Astro and Planetary Science
- Scientific Research and Discoveries
University of Guelph
2016-2025
KU Leuven
2024
University of the Western Cape
2018-2023
Joint Research Center
2023
Temple University, Japan
2020
Stanford University
2020
Excellence Cluster Universe
2012-2019
St. Mary's University, Texas
2018
University of Kentucky
1996-2017
Moscow Open Social University
2016
A summary of the experimental properties first excited 0+ states in deformed rare-earth nuclei is presented. By appealing to original definition a β vibration laid down Bohr-Mottelson picture, it re-emphasized that most 0+2 are not vibrations. consideration all available data, especially from transfer reactions, and microscopic calculations underscores need consider role pairing description, labelling, these states.
From detailed spectroscopy of 110Cd and 112Cd following the β+/electron-capture decay 110,112In β− 112Ag, very weak branches from nonyrast states are observed. The transition rates determined measured branching ratios level lifetimes obtained with Doppler-shift attenuation method inelastic neutron scattering reveal collective enhancements that suggestive a series rotational bands. In 110Cd, γ band built on shape-coexisting intruder configuration is suggested. For 112Cd, 2+ 3+ γ-band members...
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...
A systematic study is made of the Cd isotopes $^{110\text{\ensuremath{-}}116}\mathrm{Cd}$ by making use available experimental data and interacting boson model calculations incorporating both normal vibrational levels intruder excitations. At two-phonon level, appear to reproduce reasonably well in $^{110\text{\ensuremath{-}}114}\mathrm{Cd}$, whereas they break down completely for ${0}^{+}$ states $^{116}\mathrm{Cd}$. three-phonon deviations occur across isotopic chain, revealing breakdown...
Recent studies of the stable Cd isotopes, using inelastic neutron scattering, radioactive decay and nucleon-transfer reactions, have resulted in need to fundamentally reassess concept low-energy vibrational modes these isotopes. We present a synopsis nuclear physics that has led this situation, followed by status spectroscopy for against nuclei neighbouring continue with some details spectroscopic techniques used examples data obtained which lead above statements. provide further perspective...
A study of the ${\ensuremath{\beta}}^{+}$-electron capture decay ${}^{110}$In into levels ${}^{110}$Cd is combined with a reanalysis data from previous $(n,{n}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction monoenergetic neutrons. The $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidences leads to many new assignments $\ensuremath{\gamma}$ rays observed in reaction, permitting observation weak low-energy transitions, and setting stringent upper limits on unobserved branches. uncertainties...
Based on results from a measurement of weak decay branches observed following the β- 94Y and lifetime data study 94Zr by inelastic neutron scattering, collective structure is deduced in closed-subshell nucleus 94Zr. These establish shape coexistence The role subshells for nuclear collectivity suggested to be important.
The first conclusive evidence of a dipole resonance in ^{11}Li having isoscalar character observed from inelastic scattering with novel solid deuteron target is reported. experiment was performed at the newly commissioned IRIS facility TRIUMF. results show peak an excitation energy 1.03±0.03 MeV width 0.51±0.11 (FWHM). angular distribution consistent distorted-wave Born approximation framework. together shell model calculations signature that monopole tensor interaction important ^{11}Li. ab...
Many-body nuclear theory utilizing microscopic or chiral potentials has developed to the point that collectivity might be dealt with in an {\it ab initio} framework without use of effective charges; for example proper evolution operators, alternatively, through appropriate and manageable subset particle-hole excitations. We present a precise determination $E2$ strength $^{22}$Mg its mirror $^{22}$Ne by Coulomb excitation, allowing rigorous comparisons theory. No-core symplectic shell-model...
The s-wave neutron fraction of the 0+ levels in 12Be has been investigated for first time through 11Be(d,p) transfer reaction using a 5A MeV 11Be beam at TRIUMF, Canada. populated all known bound states 12Be. ground state spectroscopic factor was determined to be 0.28−0.07+0.03 while that long-lived 02+ excited 0.73−0.40+0.27. This observation, together with smaller effective separation energy indicates enhanced probability an extended density tail beyond 10Be core compared state.
Excited states in $^{152}\mathrm{Sm}$ have been investigated with the $^{152}\mathrm{Sm}(n,{n}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction. The lowest four negative-parity band structures characterized detail respect to their absolute decay properties. Specifically, a new ${K}^{\ensuremath{\pi}}={0}^{\ensuremath{-}}$ has assigned its ${1}^{\ensuremath{-}}$ head at 1681 keV. This newly observed remarkable similarity $E1$ transition rates for first excited ${K}^{\ensuremath{\pi}}={0}^{+}$...
Digestive ripening (DR) represents a powerful strategy for improving the size homogeneity of colloidal nanostructures. It relies on ligand-mediated dissolution larger nanoparticles in favor smaller ones and is often considered to be opposite Ostwald ripening. Despite its successful application size-focusing metal colloids, digestive semiconductor nanocrystals has received little attention date. Here, we explore this synthetic niche demonstrate that ligand-induced exhibits an unusual reaction...
From detailed spectroscopy of $^{110}\mathrm{Cd}$ and $^{112}\mathrm{Cd}$ following the ${\ensuremath{\beta}}^{+}/\mathrm{EC}$ decay $^{110,112}\mathrm{In}$ ${\ensuremath{\beta}}^{\ensuremath{-}}$ $^{112}\mathrm{Ag}$, presence very weak branches from nonyrast states is revealed. In $^{112}\mathrm{Cd}$, ${2}_{5}^{+}\ensuremath{\rightarrow}{0}_{4}^{+}$ ${4}_{6}^{+}\ensuremath{\rightarrow}{2}_{5}^{+}$ transitions are observed that yield...
The excited states of N=44 ^{74}Zn were investigated via γ-ray spectroscopy following ^{74}Cu β decay. By exploiting γ-γ angular correlation analysis, the 2_{2}^{+}, 3_{1}^{+}, 0_{2}^{+}, and 2_{3}^{+} in firmly established. branching E2/M1 mixing ratios for transitions deexciting measured, allowing extraction relative B(E2) values. In particular, 2_{3}^{+}→0_{2}^{+} 2_{3}^{+}→4_{1}^{+} observed first time. results show excellent agreement with new microscopic large-scale shell-model...
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...
A high-statistics \(\beta \)-decay experiment was conducted at the TRIUMF-ISAC facility using \(8\pi \) \(\gamma \)-ray spectrometer and its ancillary detectors to study low-spin structure of \(^{98}\)Zr. The analysis \)–\(\gamma \(e^-\)–\(\gamma coincidence data is presented. New measurements branching ratios mixing are reported for four \(J^{\pi } = 2^+\) states located above 2 MeV excitation energy in Based on these measurements, \(B\)(E2) values transitions lower-lying levels determined,...
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
The $({n,n}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction has been used to search for two-phonon $\ensuremath{\gamma}$-vibrational states in ${}^{166}\mathrm{Er}$. Levels at 1943 and 2028 keV have observed with collective transitions the $\ensuremath{\gamma}$ band. latter, which $B(E2;2028\ensuremath{\rightarrow}{2}_{\ensuremath{\gamma}}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}7.4\ifmmode\pm\else\textpm\fi{}2.5$ W.u. (Weisskopf unit) is interpreted as...
The ground state rotational bands of the N = Z nuclei (72)Kr, (76)Sr, and (80)Zr have been extended into angular momentum region where rotation alignment particles is normally expected. By measuring moments inertia these we observed a consistent increase in frequency required to start pair breaking, when compared neighboring nuclei. (72)Kr shows most marked effect. It has widely suggested that "delayed alignments" arise from np-pairing correlations. However, frequencies are very sensitive...
Lifetimes of levels below 4 MeV in $^{112}\mathrm{Cd}$ have been measured using the Doppler shift attenuation technique following inelastic scattering monoenergetic neutrons. Reduced transition rates are determined results previous studies and current lifetimes. The electromagnetic properties outlined, together with from nucleon-transfer scattering, interpreted terms single-particle configurations collective excitations, assuming a vibrational model intruder states. states their...
The 685 keV excitation energy of the first excited ${0}^{+}$ state in $^{152}\mathrm{Sm}$ makes it an attractive candidate to explore expected two-phonon excitations at low energy. Multiple-step Coulomb and inelastic neutron scattering studies are used probe $E2$ collectivity states this ``soft'' nucleus results compared with model predictions. No candidates for ${K}^{\ensuremath{\pi}}={0}^{+}$quadrupole vibrational found. A ${2}^{+},K=2$ strong decay ${K}^{\ensuremath{\pi}}={0}^{+}$ band a...
Experimental evidence for identification of the 5241-keV ${0}^{+}$ state in ${}^{208}$Pb as lowest-spin member ${3}^{\ensuremath{-}}\ensuremath{\bigotimes}{3}^{\ensuremath{-}}$ quartet is reported. This state, observed previously neutron transfer reactions and inelastic proton scattering, has been populated with scattering reaction. Its decay to ${3}^{\ensuremath{-}}$ octupole phonon confirmed by $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence measurements, spin-0...