Calvin R. Howell
Professor of Physics
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.
Tornow, W., et al. “Measurements of analyzing power for H2(n, n)H2 scattering at 14.1 MeV and comparisons to H2(p, p)H2.” Physical Review C, vol. 27, no. 5, Jan. 1983, pp. 2439–42. Scopus, doi:10.1103/PhysRevC.27.2439. Full Text
Howell, C. R., and S. A. Wender. “A linear voltage ramp generator for a three stage bunching system.” Nuclear Instruments and Methods, vol. 195, no. 3, Apr. 1982, pp. 443–46. Scopus, doi:10.1016/0029-554X(82)90003-9. Full Text
Dave, J. H., et al. “NEUTRON ELASTIC AND INELASTIC SCATTERING CROSS SECTIONS FOR CARBON-13 BETWEEN 10 AND 18 Mev.” Nuclear Science and Engineering, vol. 80, no. 3, Jan. 1982, pp. 388–92. Scopus, doi:10.13182/NSE82-A19823. Full Text
Tornow, W., et al. “Analyzing power measurements for (H2(npol,n)H2) scattering at 10 MeV compared to few-nucleon calculations and data for (H2(ppol,p)H2) scattering.” Physical Review Letters, vol. 49, no. 5, Jan. 1982, pp. 312–15. Scopus, doi:10.1103/PhysRevLett.49.312. Full Text
Floyd, C. E., et al. “Analyzing powers for neutron elastic scattering at forward angles.” Physical Review C, vol. 25, no. 3, Jan. 1982, pp. 1682–84. Scopus, doi:10.1103/PhysRevC.25.1682. Full Text
Guss, P. P., et al. “Spin-orbit deformations deduced from analyzing powers for inelastic neutron scattering from Fe54, Fe56, Ni58, Ni60, Sn120, and Pb208.” Physical Review C, vol. 25, no. 5, Jan. 1982, pp. 2854–57. Scopus, doi:10.1103/PhysRevC.25.2854. Full Text
Howell, C. R., and R. L. Walter. “SIMULTANEOUS MEASUREMENTS OF ANALYZING POWERS AND DIFFERENTIAL CROSS SECTIONS FOR n plus **2**8Si.” Ieee Transactions on Nuclear Science, vol. NS-30, no. 2, 1982, pp. 1132–35.
FLOYD, C. E., et al. “ACCURATE FORWARD ANGLE MEASUREMENTS WITH POLAR NEUTRONS.” Bulletin of the American Physical Society, vol. 26, no. 4, AMER INST PHYSICS, Jan. 1981, pp. 623–24.
DAVE, J. H., et al. “NEUTRON ELASTIC-SCATTERING FROM 1P-SHELL NUCLEI BETWEEN 10-15 MEV.” Bulletin of the American Physical Society, vol. 26, no. 4, AMER INST PHYSICS, Jan. 1981, pp. 551–551.