A5038648541- Nuclear Physics and Applications
- Nuclear physics research studies
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Electron and X-Ray Spectroscopy Techniques
- Dark Matter and Cosmic Phenomena
- Cold Fusion and Nuclear Reactions
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Nuclear Materials and Properties
- Scientific Research and Discoveries
- X-ray Spectroscopy and Fluorescence Analysis
- Avian ecology and behavior
- Flexible and Reconfigurable Manufacturing Systems
- Radiation Therapy and Dosimetry
- Particle accelerators and beam dynamics
- Energy Efficiency and Management
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Intensive Care Unit Cognitive Disorders
Fermi National Accelerator Laboratory
2024
TRIUMF
2011-2023
Argonne National Laboratory
2011
Technische Universität Berlin
2007-2010
University of Kassel
2008
Einstein's general theory of relativity from 19151 remains the most successful description gravitation. From 1919 solar eclipse2 to observation gravitational waves3, has passed many crucial experimental tests. However, evolving concepts dark matter and energy illustrate that there is much be learned about gravitating content universe. Singularities in lack a quantum gravity suggest our picture incomplete. It thus prudent explore exotic physical systems. Antimatter was unknown Einstein 1915....
The ${}^{18}\text{F}(p,\ensuremath{\alpha}){}^{15}$O reaction rate is crucial for understanding the final abundance of $^{18}\mathrm{F}$ predicted by nova models. $\ensuremath{\gamma}$-ray emission in first few hours after a outburst expected to be dominated 511 keV annihilation photons from decay $^{18}\mathrm{F}$, and so its production can provide important constraints on conditions during when compared with observations. Results are presented lowest-energy direct measurement date,...
The lowest-energy resonance in the Mg23(p,γ)Al24 reaction, which is dominant at classical nova temperatures, has been measured directly for first time using DRAGON recoil spectrometer. experiment used a radioactive Mg23 beam (mixed within significantly stronger Na23 beam) of peak intensity 5×107 s−1, ISAC facility TRIUMF. We extract values ER=485.7−1.8+1.3 keV and ωγ=38−15+21 meV from our data (all center-of-mass frame unless otherwise stated). In addition, prompted recalculation Q value...
Observation of the enhanced electron screening in metallic environments is fundamental importance for understanding strongly coupled astrophysical plasmas. Experimental energies determined by different groups many metals are much larger than theoretical predictions. However, a comparison between experimental and data rather ambiguous because contributions systematic errors experiments. One most important problems uncertainty resulting from oxidation target surface during measurements. Here,...
We present the first direct measurement of an astrophysical reaction using a radioactive beam isomeric nuclei. In particular, we have measured strength key 447-keV resonance in ^{26m}Al(p,γ)^{27}Si to be 432_{-226}^{+146} meV and find that this dominates thermally averaged rate for temperatures between 0.3 2.5 GK. This work represents critical development resolving one longest standing issues nuclear astrophysics research, relating proton capture reactions on excited quantum levels, offers...
Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0$\nu \beta \beta$), due their response uniformity, monolithic sensitive volume, scalability large target masses, and suitability extremely low background operations. The nEXO collaboration has designed a tonne-scale chamber that aims 0$\nu \beta$ of \ce{^{136}Xe} with projected half-life sensitivity $1.35\times 10^{28}$~yr. To reach this sensitivity, the design goal is $\leq$1\%...
The rate of the 18F(p,γ)19Ne reaction affects final abundance γ-ray observable radioisotope 18F, produced in novae. However, no successful measurement this exists and used is calculated from incomplete information on contributing resonances. Of two resonances thought to play a significant role, one has radiative width estimated assumed analogue state mirror nucleus, 19F. second does not have an assignment at all, resulting arbitrary being assumed. Here, we report first direct 18F(p,γ)^19Ne...
Silicon Photo-Multipliers (SiPMs) are detectors sensitive to single photons that used detect scintillation and Cherenkov light in a variety of physics medical-imaging applications. SiPMs measure by amplifying the photo-generated carriers (electrons or holes) via Geiger-mode avalanche. The Photon Detection Efficiency (PDE) is combined probability photon absorbed active volume device with subsequently triggered Absorption avalanche triggering probabilities correlated since latter depends on...
The ${}^{33}$S($p,\ensuremath{\gamma}$)${}^{34}$Cl reaction is important for constraining predictions of certain isotopic abundances in oxygen-neon novae. Models currently predict as much 150 times the solar abundance ${}^{33}$S nova ejecta. This overproduction factor may vary by orders magnitude due to uncertainties rate at peak temperatures. Depending on this rate, could potentially be used a diagnostic tool classifying types presolar grains. Better knowledge would also aid interpreting...
In this paper, we report on the photon emission of Silicon Photomultipliers (SiPMs) from avalanche pulses generated in dark conditions, with main objective better understanding associated systematics for next-generation, large area, SiPM-based physics experiments. A new apparatus spectral and imaging analysis was developed at TRIUMF used to measure light emitted by two SiPMs considered as photo-sensor candidates nEXO neutrinoless double-beta decay experiment: one Fondazione Bruno Kessler...
Directly measuring nuclear astrophysics reactions presents unique challenges. Low energy reaction products and small cross sections are just two of the issues that TACTIC detector addresses. is "TRIUMF Annular Chamber for Tracking Identification Charged-particles" being developed by TRIUMF University York, UK. a cylindrical, active-target TPC providing high detection efficiency; "shielding" cathode traps ionization created beam allows higher intensities than typical TPCs. The 480 anode...
During the slow neutron capture process in massive stars, reactions on light elements can both produce and absorb neutrons thereby influencing final heavy element abundances. At low metallicities, high rate of 16-O inhibit s-process nucleosynthesis unless are recycled via 17O(a,n)20Ne reaction. The efficiency this recycling is determined by competition between 17O(a,g)21Ne reactions. While some experimental data available former reaction, no exist for radiative channel at relevant...
Increasingly more intense beams of radioactive isotopes allow moving into unknown areas the nuclear chart and exploring limits in binding proton-to-neutron ratio.New aspects structure important results for astrophysics are obtained.The paper provides some overview experimental developments, facilities research results; is intended to set stage many exciting examples presented these proceedings.
The Large Hadron Collider will soon undergo an upgrade to increase its luminosity by a factor of ~10 [1]. A crucial part this be replacement the NbTi focusing magnets with Nb3Sn that achieve ~50% in field strength. This first ever large-scale implementation particle accelerator. High-Luminosity LHC Upgrade, HL-LHC is CERN project world-wide collaboration. It under construction and utilizes Magnets (named MQXF) as key ingredients tenfold integrated delivered CMS ATLAS experiments next decade....
Background: The rate of the $^{18}\mathrm{F}(p,\ensuremath{\gamma})^{19}\mathrm{Ne}$ reaction affects final abundance radioisotope $^{18}\mathrm{F}$ ejected from novae. This nucleus is important as its thought to significantly influence first-stage 511-keV and continuum $\ensuremath{\gamma}$-ray emission in aftermath No successful measurement this existed prior work, used stellar models had been calculated based on incomplete information contributing resonances.Purpose: Of two resonances...
We present our initial efforts with the DRAGON separator at TRIUMF facility towards obtaining energy dependence of astrophysical S-factor for 3 He(α, γ) 7 Be reaction in range Ecm= 2 to MeV that was recommended by recent evaluations.A comparison between existing data and new complementary Madrid data, together theoretical calculations, is also given context ongoing work.
Ion tracking is still an unusual detection method in nuclear physics. TACTIC (TRIUMF annular chamber for and identification of charged particles) suitable low-energy ejectiles. The cylindrical design allows electrical separation target drift region without hindering the ejectiles to enter region. first experiment with radioactive beam – reaction 8Li(α,n)11B which important α-process neutrino-driven supernova winds took place June '09. Since no off-the-shelf analysis tools methods are...
The d + fusion reactions have been investigated in the Zirconium environment under ultra high vacuum (UHV) conditions for projectile energies below 30 keV. experimentally determined screening energy value of 497 ± 7 eV is larger than previous results by a factor almost two. Despite UHV small deviation between experimental data and theoretical curve arising from target surface contamination could be still observed at lowest energies. Calculations made assumption formation oxide contamination,...
We have performed a direct measurement of the $^{19}\mathrm{Ne}(p,\ensuremath{\gamma})^{20}\mathrm{Na}$ reaction in inverse kinematics using beam radioactive $^{19}\mathrm{Ne}$. The key astrophysical resonance $^{19}\mathrm{Ne}+p$ system has been definitely measured for first time at ${E}_{\mathrm{c}.\mathrm{m}.}={456}_{\ensuremath{-}2}^{+5}\text{ }\text{ }\mathrm{keV}$ with an associated strength ${17}_{\ensuremath{-}5}^{+7}\text{ }\mathrm{meV}$. present results are agreement upper limits...