A5066378616- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Scientific Research and Discoveries
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Soil Management and Crop Yield
- Neutrino Physics Research
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Gamma-ray bursts and supernovae
- Muon and positron interactions and applications
- Soil and Unsaturated Flow
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Crystallography and Radiation Phenomena
- Radiopharmaceutical Chemistry and Applications
- Astro and Planetary Science
- Soil Mechanics and Vehicle Dynamics
- Particle physics theoretical and experimental studies
- Physics of Superconductivity and Magnetism
- Boron Compounds in Chemistry
University of Guelph
2016-2023
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...
The $\beta$-decay half-lives of $^{128\text{--}130}$Cd have been measured with the newly commissioned GRIFFIN $\gamma$-ray spectrometer at TRIUMF-ISAC facility. time structures most intense $\gamma$-rays emitted following were used to determine $^{128}$Cd and $^{130}$Cd be $T_{1/2}= 246.2(21)$ ms 126(4)$ ms, respectively. 3/2$^+$ 11/2$^-$ states $^{129}$Cd $T_{1/2}(3/2^+)= 157(8)$ $T_{1/2}(11/2^-)= 147(3)$ ms. Cd isotopes around $N=82$ shell closure are an important ingredient in...
Lifetimes of $2^+_1$ and $4^+_1$ states, as well some negative-parity non-yrast in $^{188-200}$Hg were measured using $\gamma-\gamma$ electronic fast timing techniques with the LaBr$_3$(Ce) detector array GRIFFIN spectrometer. The excited states populated $\epsilon/\beta^+$-decay $J^\pi =7^+/2^-$ $^{188-200}$Tl produced at TRIUMF-ISAC facility. deduced B(E2) values are compared to different interacting boson model predictions. precision achieved this work over previous ones allows for a...
The r-process has been shown to be robust in reproducing the abundance distributions of heavy elements, such as europium, seen ultra-metal poor stars. In contrast, observations elements 26 < Z 47 display overabundances relative model predictions. A proposed additional source early nucleosynthesis is weak neutrino-driven winds core-collapse supernovae. It that this site ( α ,n) reactions are both crucial and main uncertainty model-based Aiming improve certainty predictions, cross section...
The half-lives of three $\ensuremath{\beta}$-decaying states $_{49}^{131}\mathrm{In}_{82}$ have been measured with the GRIFFIN $\ensuremath{\gamma}$-ray spectrometer at TRIUMF-ISAC facility to be ${T}_{1/2}(1/{2}^{\ensuremath{-}})=328(15)\phantom{\rule{0.16em}{0ex}}\mathrm{ms}$, ${T}_{1/2}(9/{2}^{+})=265(8)\phantom{\rule{0.16em}{0ex}}\mathrm{ms}$, and ${T}_{1/2}(21/{2}^{+})=323(55)\phantom{\rule{0.16em}{0ex}}\mathrm{ms}$, respectively. first observation $\ensuremath{\gamma}$ rays following...
Spectroscopy of doubly magic ${}_{50}^{132}{\mathrm{Sn}}_{82}$ has been performed with the GRIFFIN spectrometer at TRIUMF-ISAC following $\ensuremath{\beta}$ decay ${}_{49}^{132}{\mathrm{In}}_{83}$. The analysis allowed for placement a total 70 transitions and 29 excited states in $^{132}\mathrm{Sn}$. Detailed spectroscopy also on $^{131}\mathrm{Sb}$, resulting from $^{131}\mathrm{Sn}$, produced $\ensuremath{\beta}$-delayed neutron $^{132}\mathrm{In}$. Measurement $\ensuremath{\gamma}$ rays...
The low-lying structure of semimagic $^{118}\mathrm{Sn}$ has been investigated through the $\ensuremath{\beta}$ decay $^{118}\mathrm{In}$ (${T}_{1/2}=4.45$ min) to study shape coexistence via reduced transition probabilities states in 2p-2h proton intruder band. This high-statistics was carried out at TRIUMF-ISAC with GRIFFIN spectrometer. In total, 99 transitions have placed level scheme 43 being newly observed. Three $\ensuremath{\gamma}$-ray energies near 285 keV resolved from which...
A high-precision branching ratio measurement for the superallowed Fermi ${\ensuremath{\beta}}^{+}$ emitter $^{62}\mathrm{Ga}$ was performed with Gamma-Ray Infrastructure Fundamental Investigations of Nuclei (GRIFFIN) spectrometer at Isotope Separator and Accelerator (ISAC) radioactive ion beam facility TRIUMF. The high efficiency GRIFFIN allowed 63 $\ensuremath{\gamma}$-ray transitions, intensities down to $\ensuremath{\approx}1$ part per million (ppm)...
Background: Nuclei approaching $N=Z=40$ are known to exhibit strongly deformed structures and thought be candidates for shape coexistence. In the krypton isotopes, $^{80,82}\mathrm{Kr}$ poorly characterized, preventing an understanding of evolving deformation $N=40$.Purpose: The present work aims determine electric quadrupole transition strengths moments in order better characterize their deformation.Methods: Sub-barrier Coulomb excitation was employed, impinging isotopes on...
A high-precision half-life measurement for the superallowed Fermi $\beta^+$ emitter $^{22}$Mg was performed at TRIUMF-ISAC facility using a 4$\pi$ proportional gas counter. The result of $T_{1/2} = 3.87400 \pm 0.00079$ s is factor 3 more precise than previously adopted world average and resolves discrepancy between two published measurements.
The $\ensuremath{\beta}$ decay of neutron-rich $^{129}\mathrm{In}$ into $^{129}\mathrm{Sn}$ was studied using the GRIFFIN spectrometer at ISAC facility TRIUMF. study observed half-lives ground state and each $\ensuremath{\beta}$-decaying isomers. level scheme has been expanded with thirty-one new $\ensuremath{\gamma}$-ray transitions nine excited levels, leading to a reevaluation branching ratios spin assignments. observation ($29/{2}^{+}$) 1911-keV isomeric in is reported for first time,...
Over a 12 year period, the 8π γ-ray spectrometer at TRIUMF-ISAC facility was world unique device for β-decay studies. Equipped with variety of auxiliary devices, it used in studies Fermi superallowed β+ emitters, and nuclear structure far from stability those employing high-statistics measurements. In present contribution, this latter use is highlighted examples recent data obtained decay 122Cs to 122Xe. The replaced much more powerful GRIFFIN 2014, ensuring world-leading capability...
The occurrence of octupole shapes in even-mass neutron-rich Ba isotopes has been well established. However, the situation with odd-mass and odd or odd-odd La nuclei around them is far from settled. In order to shed light on these less-studied isotopes, a fast-timing experiment was performed using GRIFFIN at TRIUMF-ISAC. A wealth excited-state lifetimes 100~ps few ns range have measured $^{144, 145, 146}$Ba $^{145,146}$La populated $\beta^-$ $\beta^--n$ decay $^{145,146}$Cs. results do not...
Excited states of $^{129}\mathrm{In}$ populated following the $\ensuremath{\beta}$ decay $^{129}\mathrm{Cd}$ were experimentally studied with GRIFFIN spectrometer at ISAC facility TRIUMF, Canada. A 480-MeV proton beam was impinged on a uranium carbide target and extracted using Ion Guide Laser Source (IG-LIS). $\ensuremath{\gamma}$ rays detected comprising plastic scintillator SCEPTAR 16 high-purity germanium (HPGe) clover-type detectors. From...
Background: Detailed spectroscopy of neutron-rich, heavy, deformed nuclei is broad interest for nuclear astrophysics and structure. Nuclei in the $r$-process path following freeze-out region impact resulting abundance distribution, structure midshell both proton neutron number helps to understand evolution subshell gaps large deformation these nuclei.Purpose: We aim improve understanding $^{160}\mathrm{Gd}$, specifically ${K}^{\ensuremath{\pi}}={4}^{+}$ bands, as well study...
Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei (GRIFFIN) is a new high-efficiency $\gamma$-ray spectrometer for decay spectroscopy research with low-energy (20-60 keV) stopped radioactive beams from the Isotope Separator and Accelerator (ISAC) facility at TRIUMF in Vancouver, Canada. GRIFFIN comprised 16 HPGe clover detectors hosts suite auxiliary detection systems tagging $\beta$ particles, neutrons, internal conversion electrons coincidence $\gamma$ rays. powerful tool...
The half-lives of isotopes around the $N=82$ shell closure are an important ingredient in astrophysical simulations and strongly influence magnitude second $r$-process abundance peak $A\sim130$ region. most neutron-rich nuclei not accessible to current generation radioactive beam facilities must therefore rely on calculations involved. Half-life measurements experimentally this region order benchmark these calculations. half-life $^{130}$Cd is particularly as it used tune Gamow-Teller...
The β -decay half lives of nuclei near the r -process path are critical information required for abundance calculations, especially those neutron number N = 82. Specifically, below doubly-magic 132 Sn key, and play an important role in formation shape second peak. this region challenging to measure due significant -delayed decay branches population isomeric states with comparable ground states. However, by measuring time distribution γ rays, these complications can be eliminated. This...