A. Esmaylzadeh
A5023884054- Nuclear physics research studies
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Rare-earth and actinide compounds
- Advanced NMR Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Radiopharmaceutical Chemistry and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Isotope Analysis in Ecology
- Chemical Thermodynamics and Molecular Structure
- Solid-state spectroscopy and crystallography
- Radioactive element chemistry and processing
- Integrated Circuits and Semiconductor Failure Analysis
- Mass Spectrometry Techniques and Applications
- Nuclear Materials and Properties
University of Cologne
2016-2025
University of the West of Scotland
2022
Atomic nuclei serve as prime laboratories for investigations of complex quantum phenomena, where minor nucleon rearrangements cause significant structural changes.
We have used the recoil distance Doppler-shift method to measure lifetimes of excited states in \(^{108}\mathrm {Ru}\), \(^{110}\mathrm and \(^{112}\mathrm {Ru}\). Excited these nuclei were populated by fusion–fission reactions between a \(^{238}\)U beam \(^{9}\)Be target an experiment at GANIL. Fission fragments identified event VAMOS++ spectrometer, while \(\gamma \)-rays detected Advanced Gamma Tracking Array (AGATA). The ground state band are consistent with rotational structures...
Direct lifetime measurements via $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidences using a fast timing detector array consisting of ${\mathrm{LaBr}}_{3}(\mathrm{Ce})$ scintillators has been applied to determine the low-lying states in semimagic $(N=50)$ nucleus $^{94}\mathrm{Ru}$. The experiment was carried out as first series ``FAIR-0'' experiments with DESPEC experimental setup at Facility for Antiproton and Ion Research (FAIR). Excited $^{94}\mathrm{Ru}$ were...
Excited states in $^{193}\mathrm{Os}$ were populated using a $^{192}\mathrm{Os}({n}_{\text{th.}},\ensuremath{\gamma})^{193}\mathrm{Os}$ thermal neutron capture reaction, with neutrons provided by the high-flux reactor of Institut Laue-Langevin Grenoble, France. Lifetimes low-spin excited measured generalized centroid difference method. A total eight mean lifetimes low-lying determined for first time, and limits three further established. Additionally,...
We report on systematic γ-γ fast-timing measurements by using four cylindrical 1.5′′×1.5′′ LaBr3(Ce) scintillator detectors which were installed in compact geometry around the focal plane of Lohengrin fission-fragment separator at Institut Laue–Langevin Grenoble, France. Unconventional γ-ray sources as 185Os and 187W produced thermal-neutron activation to provide nearly prompt low-energy γ K-X rays with average γ- X-ray multiplicity equal two. Due practically no contribution Compton...
Lifetimes of excited states in $^{211}\mathrm{At}$ were measured using the electronic $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ fast timing technique. The nucleus interest was populated a $^{208}\mathrm{Pb}(^{6}\mathrm{Li},3n)^{211}\mathrm{At}$ fusion-evaporation reaction at FN Tandem accelerator Institute for Nuclear Physics, University Cologne. lifetimes $17/{2}_{1}^{\ensuremath{-}}$ and $23/{2}_{1}^{\ensuremath{-}}$ determined, together with an upper limit...
Lifetimes of low-spin excited states in $^{98}$Zr were measured using the recoil-distance Doppler-shift technique and attenuation method. The nucleus interest was populated a $^{96}$Zr($^{18}$O,$^{16}$O)$^{98}$Zr two-neutron transfer reaction at Cologne FN Tandem accelerator. six states, which four are unknown, measured. deduced $B(E2)$ values compared with Monte Carlo shell model interacting boson configuration mixing calculations. Both approaches reproduce well most data but leave...
Low-lying states in $^{206}\mathrm{Po}$ were investigated using the fast-timing technique with ${\mathrm{LaBr}}_{3}(\mathrm{Ce})$ and high-purity germanium detectors. The excited this nucleus populated via two consecutive electron capture decays from $^{206}\mathrm{Rn}$. parent isotope was produced $^{194}\mathrm{Pt}(^{16}\mathrm{O},4n)^{206}\mathrm{Rn}$ fusion-evaporation reaction at FN-Tandem facility Institute for Nuclear Physics, University of Cologne. previously known value lifetime...
Lifetimes of ${2}_{1}^{+}$ and ${4}_{1}^{+}$ states in $^{190,192,194,196}\mathrm{Hg}$ some negative parity band members were measured using the $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ fast-timing technique with a high-purity germanium ${\mathrm{LaBr}}_{3}$(Ce) detector array. The excited populated via fusion-evaporation reactions Tandem Van de Graaff accelerator Institute Nuclear Physics Cologne, Germany. derived reduced transition probabilities...
Low-lying yrast states of $^{204}\mathrm{Po}$ and $^{206}\mathrm{Po}$ were investigated by the $\ensuremath{\gamma}--\ensuremath{\gamma}$ fast timing technique with ${\mathrm{LaBr}}_{3}$(Ce) detectors. Excited these nuclei populated in $^{197}\mathrm{Au}(^{11}\mathrm{B},4n)^{204}\mathrm{Po}$ $^{198}\mathrm{Pt}(^{12}\mathrm{C},4n)^{206}\mathrm{Po}$ fusion-evaporation reactions, respectively. The beams delivered FN-Tandem accelerator at University Cologne. lifetimes ${4}_{1}^{+}$ both...
Delayed $\ensuremath{\gamma}$ rays from neutron-rich $A=97$ fission fragments were measured using the Lohengrin spectrometer at high-flux reactor of Institut Laue-Langevin in Grenoble. Several lifetimes excited states $^{97}\mathrm{Sr}$ fast-timing technique. The nucleus exhibits shape coexistence and is located exactly border spherical ($N\ensuremath{\le}58$) deformed ($N\ensuremath{\ge}60$) ground-state deformation. It particular interest to study shape-coexisting structures...
Lifetimes have been measured for the low-lying yrast levels of $^{130,132}\mathrm{Te}$ using $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ fast timing methods. The excited states were populated in ${\ensuremath{\beta}}^{\ensuremath{-}}$ and IT decay fission fragments, mass-separated by Lohengrin separator at Institut Laue-Langevin. Four ${\mathrm{LaBr}}_{3}$(Ce) detectors, placed focal plane spectrometer, used measurement. $\ensuremath{\mu}\mathrm{s}$ isomers coincidence an...
Lifetimes of low-lying yrast states in $^{162}\mathrm{Er}$ are measured using the electronic $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ fast-timing technique. Excited were populated a $^{154}\mathrm{Sm}(^{12}\mathrm{C},4n)^{162}\mathrm{Er}$ fusion-evaporation reaction and $\ensuremath{\gamma}$ rays detected combined setup high purity germanium ${\mathrm{LaBr}}_{3}$(Ce) scintillation detectors. The lifetimes ${4}_{1}^{+}$ ${6}_{1}^{+}$ determined for first time...
The $5/{2}_{1}^{\ensuremath{-}}$, $9/{2}_{1}^{\ensuremath{-}}$, and $11/{2}_{1}^{\ensuremath{-}}$ states in $^{209}\mathrm{Po}$ were populated the $\ensuremath{\beta}$ decay of $^{209}\mathrm{At}$ their lifetimes measured using electronic $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ fast timing technique. lifetime $9/{2}_{1}^{\ensuremath{-}}$ state is for first time. $5/{2}_{1}^{\ensuremath{-}}$ to be shorter than value adopted literature while agrees well with previous...
An experiment using the electronic $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ fast-timing technique was performed to measure lifetimes of yrast states in $^{170}\mathrm{Yb}$. The lifetime ${2}^{+}$ state determined slope method. value $\ensuremath{\tau}=2.33(3)$ ns is good agreement with measured other techniques. first ${4}^{+}$ and ${6}^{+}$ are generalized centroid difference derived $B(E2)$ values compared calculations done confined beta soft model show experimental values....
The transitional nuclei $^{134}\mathrm{Ba}$ and $^{133}\mathrm{Ba}$ are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to magnetic spectrometer PRISMA at Laboratori Nazionali di Legnaro, Italy, fusion-evaporation reaction FN tandem accelerator of University Cologne, Germany. ${J}^{\ensuremath{\pi}}=19/{2}^{+}$ state 1942 keV in is identified as an isomer with a half-life $66.6(20)\phantom{\rule{0.28em}{0ex}}\mathrm{ns}$...
Lifetimes of yrast states in the rare-earth midshell isotopes $^{176,178,180}\mathrm{W}$ have been measured with fast-timing methods using Cologne iron-free Orange spectrometer and HORUS recoil distance Doppler shift method coincidence plunger setup. Different fusion evaporation reactions used to populated excited investigated nuclei. ${2}_{1}^{+}$, ${4}_{1}^{+}$, ${6}_{1}^{+}$, ${8}_{1}^{+}$ were all three tungsten addition lifetime ${10}_{1}^{+}$ state was $^{176}\mathrm{W}$. Quadrupole...
Excited states in the yrast and negative parity bands $^{92}\mathrm{Mo}$ were populated two different experiments using $^{90}\mathrm{Zr}(\ensuremath{\alpha},2n)^{92}\mathrm{Mo}$ $^{93}\mathrm{Nb}(p,2n)^{92}\mathrm{Mo}$ fusion-evaporation reactions at Cologne FN Tandem accelerator measured a hybrid setup of high purity germanium lanthanum bromide detectors. Lifetimes excited ${2}_{1}^{+}, {4}_{1}^{+}, {6}_{1}^{+}, {8}_{1}^{+}, {5}_{1}^{\ensuremath{-}}, {7}_{1}^{\ensuremath{-}}$,...
Lifetimes of the $15/{2}_{1}^{\ensuremath{-}}$ and 13/${2}_{1}^{\ensuremath{-}}$ levels in $^{129}\mathrm{Sn}$ have been measured using $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ fast timing technique which come out to be 10(3) ps 6(4) ps, respectively. The excited states were populated through internal transition decay higher lying $\textmu{}\mathrm{s}$ isomers produced as fission fragments mass separated by Lohengrin separator at Institut Laue-Langevin. generalized...