A5034584350- Nuclear physics research studies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Astronomical and nuclear sciences
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Nuclear Materials and Properties
- Quantum, superfluid, helium dynamics
- Astro and Planetary Science
- Inorganic Fluorides and Related Compounds
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Radiation Therapy and Dosimetry
Colorado School of Mines
2016-2025
Simon Fraser University
2019
Los Alamos National Laboratory
2017
Michigan State University
2009-2010
Rutgers, The State University of New Jersey
2009
University of Notre Dame
2009
Argonne National Laboratory
2009
Joint Institute for Nuclear Astrophysics
2009
Western Michigan University
2009
National Space Centre
2004
The available data on nuclear fusion cross sections important to energy generation in the Sun and other hydrogen-burning stars solar neutrino production are summarized critically evaluated. Recommended values uncertainties provided for key sections, a recommended spectrum is given $^{8}\mathrm{B}$ neutrinos. Opportunities further increasing precision of rates also discussed, including new facilities, experimental techniques, improvements theory. This review, which summarizes conclusions...
We give the LUNA results on cross section measurement of a key reaction proton-proton chain strongly affecting calculated neutrino luminosity from Sun: He3+He3-->He4+2p. Due to cosmic ray suppression provided by Gran Sasso underground laboratory it has been possible measure down lower edge solar Gamow peak, i.e. as low 16.5 keV centre mass energy. The data clearly show increase due electron screening effect but they do not exhibit any evidence for narrow resonance suggested explain observed flux.
The rate of the (17)F(p,gamma)(18)Ne reaction is important in various astrophysical events. A previous (17)F(p,p)(17)F measurement identified a 3;{+} state providing strongest resonance contribution, but strength was unknown. We have directly measured using mixed beam (17)F and (17)O at ORNL. for (18)Ne found to be omegagamma = 33 +/- 14(stat) +/-1 7(syst) meV, corresponding gamma width Gamma_{gamma} 56 24(stat) 30(syst) meV. An upper limit on direct capture S(E) <or= 65 keV b determined an...
We report on the results of ${}^{3}\mathrm{He}{(}^{4}\mathrm{He}{,2p)}^{4}\mathrm{He}$ experiment at underground accelerator facility LUNA (Gran Sasso). For first time lowest projectile energies utilized for cross section measurement correspond to below center solar Gamow peak ${(E}_{0}=22 \mathrm{keV})$. The data provide no evidence existence a hypothetical resonance in energy range investigated. Although extrapolation is needed anymore (except low-energy tail peak), must be corrected...
The 21Na(p,gamma)22Mg reaction is expected to play an important role in the nucleosynthesis of 22Na oxygen-neon novae. decay leads emission a characteristic 1.275 MeV gamma-ray line. This report provides first direct measurement rate this using radioactive 21Na beam, and discusses its astrophysical implications. energy state was measured be E(c.m.)=205.7+/-0.5 keV with resonance strength omegagamma=1.03+/-0.16(stat)+/-0.14(sys) meV.
A compact high-current 50 kV ion accelerator facility including a windowless gas target system, beam calorimeter, and detector telescopes in close geometry has been built tested. The data acquisition analysis involved multiparameter system Monte Carlo program. LUNA facility, presently installed at the Gran Sasso underground laboratory, is pilot project focused initially on cross section measurements of 3He(3He, 2p)4He reaction within thermal energy region sun. To achieve this goal,...
An exclusive measurement of the Coulomb breakup 8B into 7Be+p at 254A MeV allowed study angular correlations particles. These demonstrate clearly that E1 multipolarity dominates and E2 can be neglected. By using a simple single-particle model for treating in first-order perturbation theory, we extract zero-energy S factor S17(0)=18.6±1.2±1.0 eV b, where first error is experimental second one reflects theoretical uncertainty extrapolation.Received 4 March...
The drive of low-energy nuclear astrophysics laboratories is to study the reactions importance stellar burning processes and elemental production through nucleosynthesis, over energy range astrophysical interest. As laboratory measurements approach window, rapid drop off cross-sections a significant barrier drives need lower background interference. natural suppression underground accelerator facilities enables extension current experimental data energies. An example such interest are those...
Abstract Plastic scintillators are commonly used as first‐line detectors for special nuclear materials. Current state‐of‐the‐art plastic based on poly(vinyltoluene) (PVT) matrices containing high loadings (>15.0 wt %) of 2,5‐diphenyloxazole (PPO) offer neutron signal discrimination in gamma radiation background (termed pulse shape discrimination, PSD), however, they suffer from poor mechanical properties. In this work, a series p ‐terphenyl and fluorene derivatives were synthesized tested...
An exclusive measurement of the Coulomb breakup B8 into Be7+p at 254A MeV was used to infer low-energy Be7(p,γ)B8 cross section. The radioactive beam produced by projectile fragmentation 350A C12 and separated with FRagment Separator (FRS) Gesellschaft für Schwerionenforschung in Darmstadt, Germany. Coulomb-breakup products were momentum-analyzed KaoS magnetic spectrometer; particular emphasis placed on angular correlations particles. These demonstrate clearly that E1 multipolarity dominates...
The $^{2}\mathrm{H}$($^{82}\mathrm{Ge}$,$p$)$^{83}\mathrm{Ge}$ and $^{2}\mathrm{H}$($^{84}\mathrm{Se}$,$p$)$^{85}\mathrm{Se}$ reactions were studied with radioactive beams of $^{82}\mathrm{Ge}$ $^{84}\mathrm{Se}$ at beam energies ${E}_{\mathrm{beam}}=330$ 380 MeV, respectively. Excitation energies, proton angular distributions, asymptotic normalization coefficients have been determined for the lowest lying states $^{83}\mathrm{Ge}$ $^{85}\mathrm{Se}$. Spectroscopic factors also extracted...
The $^{237}\mathrm{Np}$($n,\ensuremath{\gamma}$)$^{238}\mathrm{Np}$ cross section has been measured in the neutron energy range from 20 meV to 500 keV using DANCE array at Los Alamos National Laboratory. This new facility allows experiments with submilligram samples and is therefore well suited investigate isotopes half-lives as low a few hundred days. In this benchmark measurement, only 0.42 mg of $^{237}\mathrm{Np}$ was sufficient determine differential sections relative well-known...
The first ($d,p$) neutron transfer reaction on a neutron-rich r-process nucleus has been measured at the Holifield Radioactive Ion Beam Facility. $^{2}\mathrm{H}(^{82}\mathrm{Ge},p)^{83}\mathrm{Ge}$ was studied by bombarding 430-$\ensuremath{\mu}g/{\mathrm{cm}}^{2}$ (${\mathrm{CD}}_{2}$)${}_{n}$ target with 330-MeV beam of radioactive $^{82}\mathrm{Ge}$. Q value ($Q=1.47\ifmmode\pm\else\textpm\fi{}0.02$ stat. $\ifmmode\pm\else\textpm\fi{}0.07$ sys. MeV) leading to determination mass $N=51$...