Henry R. Weller
Professor Emeritus of Physics
Dr. Weller's research program at TUNL has been concentrated on using radiative capture reactions induced by polarized beams of protons and deuterons to study nuclear systems. These measurements have permitted him to observe the "D-state" in the 4He nucleus, which arises from the two body tensor force. This result changes the rate of the d+d fusion reaction by almost a factor of 50 at very low energies. This is of great interest in nuclear astrophysics. In the past year, he has focused on studies of (d,n) reactions using very low energy polarized beams. Such studies have not been previously performed. These reactions are of great interest in nuclear astrophysics. Dr. Weller is also working to help develop an intense beam of polarized gamma-rays using the facilities of the Duke Free Electron Laser Laboratory. (Dr. Weller is the Nuclear Physics Program Manager and is in charge of the development of the target room for the HIGS Project at DFELL). This beam will ultimately allow new experimental studies capable of testing fundamental aspects of Quantum Chromodynamics in the low-energy sector, such as the up-to-down quark mass ratio. The experiments at HIGS require very sophisticated targets and detector systems. Dr. Weller is leading the development of these. The first experiments using these setups and the upgraded HIGS facility are expected to begin in the spring of 2008.
Sabourov, A., et al. “The 7Li(d,n0)8Be and 7Li(d,n1)8Be reactions below 160 keV.” Physical Review C, vol. 74, The American Physical Society, Dec. 2006.
Weller, M. Dugger et al including H. “Eta prime Photoproduction on the proton for Photon Energies from 1.527 to 2.227 GeV.” Physical Review Letters, vol. 96, The American Physical Society, Oct. 2006.
Parpottas, Y., et al. “Astrophysical S factor for the B11(d,n)C12 reaction below 135 keV.” Physical Review C Nuclear Physics, vol. 74, no. 1, July 2006. Scopus, doi:10.1103/PhysRevC.74.015804. Full Text
Weissman, L., et al. “Amplification and scintillation properties of oxygen-rich gas mixtures for optical-TPC applications.” Journal of Instrumentation, vol. 1, no. 1, May 2006, pp. 1–17.
Gai, Moshe, et al. “Optical Readout Time Projection Chamber (O-TPC) for a Study of Oxygen Formation in Stellar Helium Burning.” Acta Physica Hungarica A) Heavy Ion Physics, vol. 25, no. 2–4, Springer Science and Business Media LLC, Apr. 2006, pp. 461–68. Crossref, doi:10.1556/aph.25.2006.2-4.37. Full Text
Dugger, M., et al. “Eta' photoproduction on the proton for photon energies from 1.527 to 2.227 GeV.” Physical Review Letters, vol. 96, no. 6, Feb. 2006, p. 062001. Epmc, doi:10.1103/physrevlett.96.062001. Full Text
Bradford, R., et al. “Differential cross sections for γ+p→K++Y for Λ and Σ0 hyperons.” Physical Review C Nuclear Physics, vol. 73, no. 3, Jan. 2006. Scopus, doi:10.1103/PhysRevC.73.035202. Full Text
Egiyan, H., et al. “Single π+ electroproduction on the proton in the first and second resonance regions at 0.25GeV2<Q2<0.65GeV2.” Physical Review C Nuclear Physics, vol. 73, no. 2, Jan. 2006. Scopus, doi:10.1103/PhysRevC.73.025204. Full Text