W. R. Zimmerman - UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale

W. R. Zimmerman
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W. R. Zimmerman
UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale

Pubs By Year

Pub Categories

Nuclear Experiment (4)
Physics - Instrumentation and Detectors (2)
Solar and Stellar Astrophysics (2)
Physics - Optics (2)
Instrumentation and Methods for Astrophysics (1)
Nuclear Theory (1)
Physics - Superconductivity (1)

Publications Authored By W. R. Zimmerman

One of the most important goals of condensed matter physics is materials by design, i.e. the ability to reliably predict and design materials with a set of desired properties. Read More

Recently suggested transformation optics-based magnifying Maxwell fisheye lenses, which are made of two half-lenses of different radii, has been fabricated and characterized. The lens action is based on control of polarization-dependent effective refractive index in a lithographically formed tapered waveguide. We have studied wavelength and polarization dependent performance of the lenses. Read More

We report new measurements of the doubly-polarized photodisintegration of $^3$He at an incident photon energy of 16.5 MeV, carried out at the High Intensity $\gamma$-ray Source (HI$\gamma$S) facility located at Triangle Universities Nuclear Laboratory (TUNL). The spin-dependent double-differential cross sections and the contribution from the three--body channel to the Gerasimov-Drell-Hearn (GDH) integrand were extracted and compared with the state-of-the-art three--body calculations. Read More

Cross sections for \nuc{6}{Li}($\gamma$,$\gamma$)\nuc{6}{Li} have been measured at the High Intensity Gamma-Ray Source (\HIGS) and the sensitivity of these cross sections to the nucleon isoscalar polarizabilities was studied. Data were collected using a quasi-monoenergetic 86 MeV photon beam at photon scattering angles of 40$^{\circ}$--160$^{\circ}$. These results are an extension of a previous measurement at a lower energy. Read More

Affiliations: 1UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 2UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 3UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 4UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 5UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 6UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 7UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 8UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 9UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 10UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 11UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 12UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 13UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale, 14UConn, TUNL, NCCU, PTB, Weizmann, UCL, Yale

The second 2+ state of 12C, predicted over fifty years ago as an excitation of the Hoyle state, has been unambiguously identified using the 12C(g,a_0)8Be reaction. The alpha particles produced by the photodisintegration of 12C were detected using an Optical Time Projection Chamber (O-TPC). Data were collected at beam energies between 9. Read More

Affiliations: 1UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 2UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 3UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 4UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 5UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 6UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 7UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 8UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 9UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 10UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 11UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 12UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 13UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 14UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 15UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 16UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 17UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration, 18UConn-Yale-TUNL-Weizmann-PTB-UCL Collaboration

We report on the construction, tests, calibrations and commissioning of an Optical Readout Time Projection Chamber (O-TPC) detector operating with a CO2(80%) + N2(20%) gas mixture at 100 and 150 Torr. It was designed to measure the cross sections of several key nuclear reactions involved in stellar evolution. In particular, a study of the rate of formation of oxygen and carbon during the process of helium burning will be performed by exposing the chamber gas to intense nearly mono-energetic gamma-ray beams at the High Intensity Gamma Source (HIgS) facility. Read More