A5083293481- Nuclear physics research studies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Nuclear Materials and Properties
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Astrophysical Phenomena and Observations
- Crystallography and Radiation Phenomena
- Astro and Planetary Science
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- High-pressure geophysics and materials
Canadian Nuclear Laboratories
2020-2025
National Superconducting Cyclotron Laboratory
2014-2024
Michigan State University
2014-2024
University of Tennessee at Knoxville
2019-2023
National Laboratory of Energy and Geology
2018-2023
TRIUMF
2023
Universidade de Santiago de Compostela
2010-2022
Institut National de Physique Nucléaire et de Physique des Particules
2013-2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2022
Centre National de la Recherche Scientifique
2013-2022
Abstract The reported relative biological effectiveness (RBE) for thermal neutrons has a large range (5–51, cytogenetic endpoints), which can confound radiation protection decision-making. To determine whether neutron spectra influence RBE, the RBE of reactor-derived average energy 31 meV was evaluated in human peripheral blood lymphocytes using two classical DNA double-strand break endpoints: dicentric chromosome assay (DCA) and cytokinesis-block micronucleus assay. Dose-response curves 41...
Total fission cross sections of ${}^{181}$Ta induced by protons at different relativistic energies have been measured GSI Darmstadt using the inverse kinematic technique. These data contribute to solve inconsistencies in previously reported measurements, but also help benchmark state-of-the-art reaction codes. The energy range covered with these measurements allowed us investigate onset and temperature dependence dissipative transient effects small deformation.
The thermonuclear ^{30}P(p,γ)^{31}S reaction rate is critical for modeling the final elemental and isotopic abundances of ONe nova nucleosynthesis, which affect calibration proposed thermometers identification presolar grains, respectively. Unfortunately, this essentially unconstrained experimentally, because strengths key ^{31}S proton capture resonance states are not known, largely due to uncertainties in their spins parities. Using β decay ^{31}Cl, we have observed β-delayed γ a state at...
We have studied the β decay of Tz=−1,f7/2 shell nuclei Ni54,Fe50,Cr46, and Ti42 produced in fragmentation reactions. The proton separation energies daughter Tz=0 are relatively large (≈4–5 MeV) so studies γ rays essential. experiments were performed at GSI as part Stopped-beam campaign with RISING setup consisting 15 Euroball Cluster Ge detectors. From newly obtained high precision β-decay half-lives, excitation energies, branching ratios, we able to extract Fermi Gamow-Teller transition...
Background: Measurements of $\beta$ decay provide important nuclear structure information that can be used to probe isospin asymmetries and inform astrophysics studies. Purpose: To measure the $\beta$-delayed $\gamma$ $^{26}$P compare results with previous experimental shell-model calculations. Method: A fast beam produced using fragmentation was implanted into a planar germanium detector. Its $\gamma$-ray emission measured an array 16 high-purity detectors. Positrons emitted in were...
Spallation reactions on fissile nuclei represent an appropriate tool to investigate dissipative effects in nuclear fission. In this work, we have studied transient and proton- deuteron-induced fission $^{208}\mathrm{Pb}$ at $500A$ MeV. A dedicated experimental setup optimized for inverse kinematics measurements made it possible identify atomic number both fragments with high resolution, reconstruct the charge of fissioning system. We could then determine width distribution as well partial...
The production cross sections of four $N=127$ isotones (${}^{207}$Hg, ${}^{206}$Au, ${}^{205}$Pt, and ${}^{204}$Ir) have been measured using ($p$,$n$) charge-exchange reactions, induced in collisions a ${}^{208}$Pb primary beam at 1 A GeV with Be target. These data allow one to investigate the use reaction mechanism extend limits chart nuclides toward important $r$-process nuclei region third peak elemental abundance distribution.
One-neutron knockout reactions from neutron-rich nuclei, with Z=6−13 and N=8−22, were studied at the Fragment Separator (GSI) high beam energies, around 700 MeV/nucleon. Structural phenomena such as formation of one-neutron halos in odd-mass carbon isotopes (C15,17,19) will be discussed. In addition, measurements N22 carried out for first time demonstrate clearly change a 0d5/2 to 1s1/2 orbital valence neutron, an effect that is expected above N=14 was also observed O23 F24. The possibility...
Production cross-sections and longitudinal velocity distributions of the projectile-like residues produced in reactions 112Sn + 124Sn both at an incident beam energy 1 AGeV were measured with high-resolution magnetic spectrometer, Fragment Separator (FRS) GSI. For characteristics nuclide production cross sections determined for atomic number Z $\geq$ 10. A comparison results two is presented.
The ^{30}P(p,γ)^{31}S reaction plays an important role in understanding the nucleosynthesis of A≥30 nuclides oxygen-neon novae. Gaseous Detector with Germanium Tagging was used to measure ^{31}Cl β-delayed proton decay through key J^{π}=3/2^{+}, 260-keV resonance. intensity I_{βp}^{260}=8.3_{-0.9}^{+1.2}×10^{-6} represents weakest β-delayed, charged-particle emission ever measured below 400 keV, resulting a branching ratio Γ_{p}/Γ=2.5_{-0.3}^{+0.4}×10^{-4}. By combining this measurement...
An unexpected breakdown of the isobaric multiplet mass equation in $A=20,T=2$ quintet was recently reported, presenting a challenge to modern theories nuclear structure. In present work, excitation energy lowest $T=2$ state $^{20}\mathrm{Na}$ has been measured be $6498.4\ifmmode\pm\else\textpm\fi{}0.{2}_{\text{stat}}\ifmmode\pm\else\textpm\fi{}0.{4}_{\text{syst}}$ keV by using superallowed ${0}^{+}\ensuremath{\rightarrow}{0}^{+}$ beta decay $^{20}\mathrm{Mg}$ access it and an array...
Shell closures and their associated magic numbers of nucleons provide a unique means for studying the structure exotic nuclei far from stability. An experiment was recently performed at National Superconducting Cyclotron Laboratory to measure resonant elastic proton scattering on 46Ar in inverse kinematics region containing isobaric analogue states 47Ar, an N=29 nucleus with one neutron above N=28 shell closure. Four candidate resonances were observed: corresponding 3/2− ground state another...
The radionuclide $^{22}\mathrm{Na}$ is a target of $\ensuremath{\gamma}$-ray astronomy searches, predicted to be produced during thermonuclear runaways driving classical novae. $^{22}\mathrm{Na}(p,\ensuremath{\gamma})\phantom{\rule{0.16em}{0ex}}^{23}\mathrm{Mg}$ reaction the main destruction channel nova, hence, its rate needed accurately predict yield. However, experimental determinations resonance strengths have led inconsistent results. In this Rapid Communication, we report measurement...
Background: The established GAseous Detector with GErmanium Tagging (GADGET) detection system is used to measure weak, low-energy β-delayed proton decays.It consists of the gaseous Proton equipped a MICROMEGAS (MM) readout detect protons and other charged particles calorimetrically, surrounded by Segmented Germanium Array (SeGA) for high-resolution prompt γ-rays.Purpose: To upgrade GADGET's operate as compact Time Projection Chamber (TPC) detection, 3D imaging identification singleand...
One-neutron knockout data for 18−22N are analyzed in the eikonal approximation of Glauber model. The role s-d shell and crossing N=14 neutron subshell discussed. Of particular interest is nucleus 22N, where provide a sensitive experimental test possible halo structure its ground state. observation narrow momentum distribution 21N fragments, together with an essential 1s1/2 contribution needed to describe observed longitudinal-momentum distribution, allow firm conclusion that state 22N...
The residual nuclei produced in the spallation reaction of 136Xe at 200A MeV on protons have been studied by measuring isotopic distributions for elements from cadmium (Z=48) to cesium (Z=55) using fragment separator (FRS) spectrometer GSI and inverse kinematics technique. This is one few measurements performed such a low projectile energy, close validity limit intranuclear cascade models as incl or isabel. experimental results compared these codes coupled evaporation code abla. Both...
Background: $^{31}\mathrm{Cl}$ is a neutron-deficient isotope with half-life of ${T}_{1/2}=190(1)$ ms. The nuclear structure its daughter, $^{31}\mathrm{S}$, important for the determination thermonuclear $^{30}\mathrm{P}(p,\ensuremath{\gamma})^{31}\mathrm{S}$ reaction rate, which affects final isotopic abundances ejecta from classical oxygen-neon novae.Purpose: We aim to determine $\ensuremath{\beta}$ feedings, $\ensuremath{\gamma}$-decay branchings, and excitation energies states populated...
Background: The Doppler broadening of $\gamma$-ray peaks due to nuclear recoil from $\beta$-delayed nucleon emission can be used measure the energies nucleons. This method has never been tested using proton or applied a heavier than $A=10$. Purpose: To test and apply this $^{26}$P($\beta p\gamma$)$^{25}$Al decay sequence. Methods: A fast beam $^{26}$P was implanted into planar Ge detector, which as $\beta$-decay trigger. SeGA array high-purity detectors detect $\gamma$ rays Results:...
Production cross sections of residual nuclei obtained by knockout and fragmentation reactions different tin isotopes accelerated at 1A GeV have been measured with the fragment separator (FRS) GSI, Darmstadt. The new measurements are used to investigate neutron-excess dependence neutron- proton-knockout sections. These compared Glauber model calculations coupled a nuclear de-excitation code in order role remnant excitations. This bench marking shows an overestimation for removal deeply bound...
We consider the potential for a 10 kg undoped cryogenic CsI detector operating at Spallation Neutron Source to measure coherent elastic neutrino-nucleus scattering and its sensitivity discover new physics beyond standard model (BSM). Through combination of increased event rate, lower threshold, good timing resolution, such would significantly improve on past measurements. considered tests several BSM scenarios as neutrino nonstandard interactions accelerator-produced dark matter. This...