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.
Gamma Beam Diagnostics awarded by (Principal Investigator). 2014 to 2015
International Collaboration Between HIGS (TUNL) and S-DALINAC (Darmstadt) to Investigate the Dipole Strength in the Particle Threshold Region of Nuclei awarded by National Science Foundation (Principal Investigator). 2003 to 2008
International Collaboration between TUNL and Mainz to Study the Helicity Structure of Photoreactions on Deuterium and He awarded by National Science Foundation (Principal Investigator). 2002 to 2007
Weller, H. R., et al. “Research opportunities at the upgraded HIγS facility.” Progress in Particle and Nuclear Physics, vol. 62, no. 1, Jan. 2009, pp. 257–303. Scopus, doi:10.1016/j.ppnp.2008.07.001. Full Text
Stave, S., et al. “Cross section measurements of the B10(d,n0)C11 reaction below 160 keV.” Physical Review C Nuclear Physics, vol. 77, no. 5, May 2008. Scopus, doi:10.1103/PhysRevC.77.054607. Full Text
Ahmed, M. W., et al. “Near-threshold deuteron photodisintegration: An indirect determination of the Gerasimov-Drell-Hearn sum rule and forward spin polarizability (γ0) for the deuteron at low energies.” Physical Review C Nuclear Physics, vol. 77, no. 4, Apr. 2008. Scopus, doi:10.1103/PhysRevC.77.044005. Full Text
Perdue, MA Blackston MW Ahmed B. A., et al. “First observation of the splittings of the E1 p-wave amplitudes in low energy deuteron photodisintegration and its implications for the Gerasimov-Drell-Hearn Sum Rule integrand.” Phys. Rev., vol. C78, no. 034003, 2008.
Dugger, M., et al. “pi(0) photoproduction on the proton for photon energies from 0.675 to 2.875 GeV.” Physical Review C, vol. 76, no. 2, Aug. 2007. Wos-lite, doi:10.1103/PhysRevC.76.025211. Full Text
Denizli, H., et al. “Q2 dependence of the S11(1535) photocoupling and evidence for a P-wave resonance in η electroproduction.” Physical Review C Nuclear Physics, vol. 76, no. 1, July 2007. Scopus, doi:10.1103/PhysRevC.76.015204. Full Text
Bradford, R. K., et al. “First measurement of beam-recoil observables Cx and Cz in hyperon photoproduction.” Physical Review C Nuclear Physics, vol. 75, no. 3, Mar. 2007. Scopus, doi:10.1103/PhysRevC.75.035205. Full Text
Ahmed, M., et al. “An Indirect Determination of the Gerasimov-Drell-Hearn (GDH) Sum Rule for the Deuteron at Low Energies.” Bulletin of the Aps, vol. 52, no. 3, The American Physical Society, 2007.
Young, Alexander, et al. “Calibration and Performance of the UConn-Yale_PTB-Weizmann-UCL-TUNL O-TOC.” Bulletin of the American Physical Society, vol. 52, no. 9, The American Physical Society, 2007.
Stave, S., and HR Weller et al. “Preciese Determination of Total Absolute Gamma Ray Intensity at HIGS.” Bulletin of the Aps, vol. 52, no. 9, The American Physical Society, 2007.