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.
Battaglieri, M., et al. “Photoproduction of the omega meson on the proton at large momentum transfer.” Physical Review Letters, vol. 90, no. 2, Jan. 2003, p. 022002. Epmc, doi:10.1103/physrevlett.90.022002. Full Text
Biselli, A., et al. “[Formula Presented] reaction studied in the [Formula Presented] mass region using polarization asymmetries.” Physical Review C Nuclear Physics, vol. 68, no. 3, Jan. 2003. Scopus, doi:10.1103/PhysRevC.68.035202. Full Text
Joo, K., et al. “Measurement of the polarized structure function σ LT′ for p(e→,e′p) π0 in the Δ (1232) resonance region.” Physical Review C Nuclear Physics, vol. 68, no. 3, Jan. 2003, pp. 322011–15.
Egiyan, K. S., et al. “Observation of nuclear scaling in the [Formula Presented] reaction at [Formula Presented].” Physical Review C Nuclear Physics, vol. 68, no. 1, Jan. 2003. Scopus, doi:10.1103/PhysRevC.68.014313. Full Text
Tonchev, A. P., et al. “The 10B(p,gamma)11C Reaction at Astrophysically Relevant Energies.” Physical Review C, vol. C68, American physical Society, 2003.
Biselli, A., and the CLAS Collaboration including H. R. Weller. “Study of the Delta(1232) using Single and double Polarization Asymmetries.” Physical Review C, American Physical Society, 2003.
Pietralla, N., et al. “Parity measurements of nuclear dipole excitations using FEL-generated γ-rays at HIγS.” Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 483, no. 1–2, May 2002, pp. 556–59. Scopus, doi:10.1016/S0168-9002(02)00381-9. Full Text
Pietralla, N., et al. “Identification of the J-pi = 1- two-phonon state of 88Sr.” Physical Review C, vol. 65, no. 047305, American Physical Society, Apr. 2002.
Canon, R. S., et al. “3H(p,gamma)4He reaction below Ep=80 keV.” Physical Review C, vol. 65, no. 044008, American Physical Society, Apr. 2002.