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.
Rice, B. J., et al. “Two-deuteron photodisintegration of 4He at Eγ=150-250 MeV.” Physical Review C Nuclear Physics, vol. 61, no. 6, Jan. 2000, pp. 646121–28.
Wulf, E. A., et al. “New photodisintegration threshold observable in 3He.” Physical Review C Nuclear Physics, vol. 61, no. 2, Jan. 2000, pp. 216011–14.
al, JH Kelley et. “"The 11B(p,ƒ×)12C Reaction below 100 keV".” Phys. Rev., vol. C62, 2000.
Weller, H. R. “Threshold contribution to the Gerasimov-Drell-Hearn sum rule in He-3.” Few Body Problems in Physics ’99, vol. 12, 2000, pp. 287–92.
Schreiber, E. C., et al. “First Measurement of the Near-Threshold Analyzing Power Using a Free-Electron Laser Based g-Ray Source.” Phys. Rev. C, vol. 61, 2000.
Gaff, S. J., et al. “"The Spin-Parity of the 7.478 MeV State of 10B from the 9Be(p,ƒ×)10B Reaction,".” Physical Review C, vol. C59, no. 6, American Physical Society, June 1999.
Wulf, E. A., et al. “Angular distribution coefficients for γ-ray polarizations produced in polarized capture reactions.” Atomic Data and Nuclear Data Tables, vol. 72, no. 1, Jan. 1999, pp. 21–32. Scopus, doi:10.1006/adnd.1999.0807. Full Text
Park, S. H., et al. “OK-4/Duke monochromatic γ-ray source: Performance and prediction.” Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 407, no. 1–3, Apr. 1998, pp. 224–28. Scopus, doi:10.1016/S0168-9002(97)01400-9. Full Text
Weller, H. R. “Polarized radiative capture studies of the 3-body system below 80 keV.” Nuclear Physics A, vol. 631, Mar. 1998, pp. 627–32.