Calvin R. Howell

Calvin R. Howell

Professor of Physics

Office Location: 
221 Dfell, Durham, NC 27708
Front Office Address: 
Box 90308, Durham, NC 27708-0308
Phone: 
(919) 660-2632

Overview

Professor Howell’s research is in the area of experimental nuclear physics with emphasis on the quantum chromodynamics (QCD) description of low-energy nuclear phenomena, including structure properties of nucleons and nuclei and reaction dynamics in few-nucleon systems.   The macroscopic properties of nucleon structure and the residual strong nuclear force between neutrons and protons in nuclei emerge from QCD at distances where the color interactions between quarks and gluons are strong.  However, the details of the mechanisms that generate the strong nuclear force are not well understood.   Effective field theories (EFT) and Lattice QCD calculations provide theoretical frames that connect low-energy nuclear phenomena to QCD.  Professor Howell and collaborators are conducting experiments on few-nucleon systems that test predictions of ab-initio theory calculations for the purpose of providing insight about the QCD descriptions of low-energy nucleon interactions and structure.  His current projects include measurements of the electromagnetic and spin-dependent structure properties of nucleons via Compton scattering on the proton and few-nucleon systems and studies of two- and three-nucleon interactions using few-nucleon reactions induced by photons and neutrons.  In the coming years, a focus will be on investigating the neutron-neutron interaction in reactions and inside nuclei.  In addition, his work includes applications of nuclear physics to national nuclear security, medical isotope production, and plant biology. Most of his research is carried out at the High Intensity Gamma-ray Source and the tandem laboratory at TUNL. 

Education & Training

  • Ph.D., Duke University 1984

Sabourov, A., et al. “The Li7(d→,n0)Be8 and Li7(d→,n1)Be8 reactions below 160 keV.” Physical Review C  Nuclear Physics, vol. 74, no. 6, Jan. 2006. Scopus, doi:10.1103/PhysRevC.74.064611. Full Text

Kapadia, A. J., et al. “Non-invasive estimation of potassium (39K) in Bovine Liver using Neutron Stimulated Emission Computed Tomography (NSECT).” Ieee Nuclear Science Symposium Conference Record, vol. 4, Jan. 2006, pp. 2076–78. Scopus, doi:10.1109/NSSMIC.2006.354322. Full Text

Sabourov, A., et al. “Astrophysical S factor for the Li7(d,n0)Be8 and Li7(d,n1)Be8 reactions.” Physical Review C  Nuclear Physics, vol. 73, no. 1, Jan. 2006. Scopus, doi:10.1103/PhysRevC.73.015801. Full Text

Sharma, A. C., et al. “Design and construction of a prototype rotation modulation collimator for near-field high-energy spectroscopic gamma imaging.” Ieee Nuclear Science Symposium Conference Record, vol. 4, Jan. 2006, pp. 2021–24. Scopus, doi:10.1109/NSSMIC.2006.354310. Full Text

Gonzalez Trotter, D. E., et al. “Neutron-deuteron breakup experiment at En=13MeV: Determination of the 1S0 neutron-neutron scattering length ann.” Physical Review C  Nuclear Physics, vol. 73, no. 3, Jan. 2006. Scopus, doi:10.1103/PhysRevC.73.034001. Full Text

Tonchev, A. P., et al. “The high intensity γ-ray source (HIγS) and recent results.” Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions With Materials and Atoms, vol. 241, no. 1–4, Dec. 2005, pp. 170–75. Scopus, doi:10.1016/j.nimb.2005.07.080. Full Text

Crawford, B. E., et al. “Direct nn-scattering at the YAGUAR reactor.” Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions With Materials and Atoms, vol. 241, no. 1–4, Dec. 2005, pp. 190–94. Scopus, doi:10.1016/j.nimb.2005.07.023. Full Text

Wut, Y. K., et al. “Recommissioning of duke storage ring with a rom-damped RF cavity and a new straight section lattice for fels.” Proceedings of the Ieee Particle Accelerator Conference, vol. 2005, Dec. 2005, pp. 3934–36. Scopus, doi:10.1109/PAC.2005.1591674. Full Text

Kapadia, A. J., et al. “Non-invasive quantification of iron56Fe in beef liver using neutron stimulated emission computed tomography.” Ieee Nuclear Science Symposium Conference Record, vol. 4, Dec. 2005, pp. 2232–34. Scopus, doi:10.1109/NSSMIC.2005.1596778. Full Text

Hamilton, D. J., et al. “Polarization transfer in proton compton scattering at high momentum transfer.” Physical Review Letters, vol. 94, no. 24, June 2005. Scopus, doi:10.1103/PhysRevLett.94.242001. Full Text

Pages