Measurement of the Doubly-Polarized $\vec{{^3}He}(\vec{\gamma},n)pp$ Reaction at 16.5 MeV and Its Implications for the GDH Sum Rule

G. Laskaris, 2, ∗ X. Yan, 2 J. M. Mueller, 2, † W. R. Zimmerman, 2 W. Xiong, 2 M. W. Ahmed, 2, 3 T. Averett, P.-H. Chu, 2, ‡ A. Deltuva, C. Flower, 2 A. C. Fonseca, H. Gao, 2 J. Golak, J. N. Heideman, 8 H. J. Karwowski, M. Meziane, 2 P. U. Sauer, R. Skibiński, I. I. Strakovsky, H. R. Weller, 2 H. Wita la, and Y. K. Wu 2 Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA Department of Physics, Duke University, Durham, North Carolina 27708, USA Department of Mathematics and Physics, North Carolina Central University, Durham, North Carolina 27707, USA College of William and Mary, Williamsburg, Virginia 23187, USA Institute of Theoretical Physics and Astronomy, Vilnius University, LT-01108 Vilnius, Lithuania Centro de F́ısica Nuclear da Universidade de Lisboa, P-1649-003 Lisboa, Portugal M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30348 Kraków, Poland Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA Institut für Theoretische Physik, Leibniz Universität Hannover, D-30167 Hannover, Germany Department of Physics, The George Washington University, Washington DC 20052, USA (Dated: June 2, 2015)