A5041591872- Nuclear physics research studies
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Astronomical and nuclear sciences
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Rare-earth and actinide compounds
- Radiation Therapy and Dosimetry
- Quantum Chromodynamics and Particle Interactions
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Quantum, superfluid, helium dynamics
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Luminescence Properties of Advanced Materials
- Solid-state spectroscopy and crystallography
- Advanced Optical Sensing Technologies
- Superconducting Materials and Applications
- Planetary Science and Exploration
- Radiation Effects in Electronics
- Crystallography and Radiation Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
University of Kentucky
2012-2024
UGC DAE Consortium for Scientific Research
2024
UGC-DAE Consortium for Scientific Research, Kolkata Centre
2024
Georgia Institute of Technology
2022-2023
University of Dallas
2022
Homi Bhabha National Institute
2020-2022
State Street (United States)
2022
Variable Energy Cyclotron Centre
2020
University of Surrey
2017
Bhabha Atomic Research Centre
2016
The low-lying, low-spin levels of $^{76}\mathrm{Ge}$ were studied with the $(n,{n}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction. Gamma-ray excitation function measurements performed at incident neutron energies from 1.6 to 3.7 MeV, and $\ensuremath{\gamma}$-ray angular distributions measured 3.0 3.5 MeV. From these measurements, level spins, lifetimes, intensities, multipole mixing ratios determined. No evidence for a number previously placed was found. Below 3.3 many new identified,...
The low-spin structure of $^{94}\mathrm{Zr}$ has been studied with the ($n$,${n}^{'}$\ensuremath{\gamma}) reaction, and branching ratios, lifetimes, multipolarities spin assignments were determined. ${2}_{2}^{+}$ state at 1671.4 keV identified as lowest mixed-symmetry in $^{94}\mathrm{Zr}$. 752.5-keV transition from this to ${2}_{1}^{+}$ level a large $B(M1)$ value 0.33(5) ${\ensuremath{\mu}}_{N}^{2}$, $B(E2)$ ground an unusually 8(1) W.u. $M1$ strength is agreement IBM-2 predictions U(5)...
Measurements consisting of $\ensuremath{\gamma}$-ray excitation functions and angular distributions were performed using the ($n,{n}^{\ensuremath{'}}\ensuremath{\gamma}$) reaction on $^{62}\mathrm{Ni}$. The function data allowed us to check consistency placement transitions in level scheme. From distributions, lifetimes levels up $~3.8$ MeV energy extracted with Doppler-shift attenuation method. experimentally deduced values reduced transition probabilities compared predictions quadrupole...
High-spin states in $^{132}\mathrm{Te}$, an isotope with two proton particles and neutron holes outside of the $^{132}\mathrm{Sn}$ doubly magic core, have been extended up to excitation energy 6.17 MeV. The prompt-delayed coincidence technique has used correlate above ${T}_{1/2}=3.70(9)\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\text{s}$ isomer $^{132}\mathrm{Te}$ lower using $^{232}\mathrm{Th}(^{7}\mathrm{Li},f)$ at 5.4 MeV/u Indian National Gamma Array (INGA). With...
The lifetime of the ${2}_{1}^{+}$ state at 1256.7 keV in $^{112}\mathrm{Sn}$ has been determined using ($n$,${n}^{'}\ensuremath{\gamma}$) reaction. Angular distribution measurements were carried out a neutron energy 1.7 MeV, above threshold and below that second excited level. Through Doppler-shift attenuation method, is as ${750}_{\ensuremath{-}90}^{+125}$ fs, which gives $B(E2;{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ value ${10.9}_{\ensuremath{-}1.6}^{+1.5}$ W.u. This $E2$ strength...
The low-lying structure of ${}_{40}^{94}\mathrm{Zr}$ was studied with the ($n,{n}^{'}\ensuremath{\gamma}$) reaction, and a level scheme established based on excitation function $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidence measurements. Branching ratios, multipole mixing spin assignments were determined from angular distribution Lifetimes levels up to 3.4 MeV measured by Doppler-shift attenuation method, for many transitions reduced transition probabilities determined. In addition...
Excited states in $^{106}\mathrm{Pd}$ were studied with the $(n,{n}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction, and comprehensive information for excitations spin $\ensuremath{\le}6\phantom{\rule{0.16em}{0ex}}\ensuremath{\hbar}$ was obtained. The data include level lifetimes femtosecond regime, spins parities, transition multipolarities, multipole mixing ratios, which allow determination of reduced probabilities. $E2$ decay strength to low-lying is mapped up $\ensuremath{\approx}2.4$ MeV...
Gamma-ray angular distribution measurements following the ${}^{\mathrm{nat}}$Ni($n,{n}^{'}\ensuremath{\gamma}$) reaction were carried out at 1.6 and 1.8 MeV neutron energies. Through Doppler-shift attenuation method, lifetime of ${2}_{1}^{+}$ state in $^{58}\mathrm{Ni}$ is determined as $\ensuremath{\tau}=1.{00}_{\ensuremath{-}0.10}^{+0.15}$ ps, which yields a $B(E2;{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ value $9.{4}_{\ensuremath{-}1.2}^{+1.0}$ W.u. From previous this work, average...
Low-lying multiphonon states in $^{136}\mathrm{Ba}$ have been populated with the inelastic neutron scattering reaction. Excitation functions were performed at energies from 2.2 to 3.9 MeV, and $\ensuremath{\gamma}$-ray angular distributions measured 2.5, 3.0, 3.5 MeV. Lifetimes determined using Doppler-shift attenuation method, electromagnetic transition rates deduced. The previously assigned ${2}_{1,\mathrm{ms}}^{+}$ mixed-symmetry state 2128.9 keV has confirmed is not greatly fragmented....
Elastic and inelastic differential cross sections for neutron scattering from $^{56}\mathrm{Fe}$ have been measured several incident energies 1.30 to 7.96 MeV at the University of Kentucky Accelerator Laboratory. Scattered neutrons were detected using a ${\mathrm{C}}_{6}{\mathrm{D}}_{6}$ liquid scintillation detector pulse-shape discrimination time-of-flight techniques. The deduced compared with previously reported data, predictions evaluation databases ENDF, JENDL, JEFF, theoretical...
The low-lying, low-spin levels of $^{76}\mathrm{Se}$ were studied with the $(n,{n}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction. Gamma-ray excitation function measurements performed at incident neutron energies from 2.0 to 3.5 MeV, and $\ensuremath{\gamma}$-ray angular distributions measured 2.4, 3.0, 3.7 MeV. From these measurements, level spins, lifetimes, branching ratios, multipole mixing ratios determined. We established ${0}_{2}^{+}$ band, which supports shape coexistence in...
Excited states in $^{58,60,62}\mathrm{Ni}$ were populated via inelastic proton scattering at the Australian National University as well neutron of Kentucky Accelerator Laboratory. The Super-e electron spectrometer and CAESAR Compton-suppressed HPGe array used complementary experiments to measure conversion coefficients $\ensuremath{\delta}(E2/M1)$ mixing ratios, respectively, for a number ${2}^{+}\ensuremath{\rightarrow}{2}^{+}$ transitions. data obtained combined with lifetimes branching...
With their complex low-spin structure, the germanium isotopes have accrued a large number of experimental data which challenge nuclear models. The structure $^{74}\mathrm{Ge}$ isotope is investigated here with resonance fluorescence as part an extensive campaign tests shell model in isotopic chain using complementary techniques. Levels were excited $3.10--5.44$ MeV photon beams provided by High Intensity Gamma-Ray Source at TUNL. Many new levels identified and spins, parities, branching...
ZnO nanoarrays were grown via a low-temperature hydrothermal method. Solutions, each with different additive combinations, prepared and evaluated. The effects of the additives involved in growth procedure, i.e., ammonium hydroxide sodium citrate, studied terms morphological, optical scintillation properties nanostructures. Measurement nanorod (NR) length, corresponding photoluminescence (PL) spectra their dependence on present solution are discussed. NRs silica substrate, whose UV...
A high fill factor SSPM built using a standard CMOS fabrication process can provide an energy resolution of 12.4% at 511 keV CsI(Tl) crystals. The was operated excess bias 2 V and 0 °C. magnitude the noise terms under these conditions are provided. This is compared to 11.7% PMT room temperature identical crystal. SSPMs PMT-like resolution. Additional developments in back-illuminated position-sensitive devices device has promise low-noise, fill-factor design, initial results quantum...
New scintillators belonging to Cs(Ba,Sr)(Br,I) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> crystal family have been grown and investigated at RMD. The crystals were using the melt-based vertical Bridgman method. iodide compositions brighter compared bromides. Scintillation properties of these studied under gamma irradiation, particularly CsBaI :Eu in more details. has a tetragonal structure, density 4.8 g/cc. primary investigations...
Recently a number of alkaline earth halide scintillators doped with Eu <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> have been reported on. They are characterized by very good proportionality, high up to 100,000 photons/MeV light yield, and energy resolution, as low 2.8% at 662 keV. Yet, one the issues facing these materials is radiation trapping. Radiation trapping results from small Stokes shift that creates considerable overlap...
Excited levels of $^{130}\mathrm{Te}$ were studied with the $(n,$ ${n}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction. Excitation functions, $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidences, angular distributions, and Doppler shifts measured for $\ensuremath{\gamma}$ rays from up to an excitation energy 3.3 MeV. Detailed information that includes level lifetimes, multipole-mixing ratios, branching electromagnetic transition rates deduced these measurements is presented. Large-scale...
A promising composition, Ce doped Cs <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> LiYBr xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> (CLYB) originally introduced by van Loef et al. has been investigated recently as a gamma-ray and neutron detector. It belongs to the elpasolite family cubic structure. single crystal of this material grown using vertical Bridgman method. Scintillation properties such energy resolution, emission,...
The low-lying, low-spin levels of $^{141}\mathrm{Pr}$ were investigated using ($n,{n}^{'}\ensuremath{\gamma}$) techniques. Level energies, branching ratios, and tentative spin assignments for more than 100 states, linked by nearly 300 transitions, obtained from two angular distributions (${E}_{n}=2.0$ 3.0 MeV) an excitation function measurement (${E}_{n}=1.5\text{\ensuremath{-}}3.2$ MeV). application the Doppler-shift attenuation method led to determination lifetimes. spectroscopic data...