1304.5442 (G. Laskaris et al.)

First Measurements of Spin-Dependent Double-Differential Cross Sections
and the GDH Integrand from \vec{^3He}(\vecγ,n)pp at Incident Photon
Energies of 12.8 and 14.7 MeV    [PDF]

G. Laskaris, Q. Ye, B. Lalremruata, Q. J. Ye, M. W. Ahmed, T. Averett, A. Deltuva, D. Dutta, A. C. Fonseca, H. Gao, J. Golak, M. Huang, H. J. Karwowski, J. M. Mueller, L. S. Myers, C. Peng, B. A. Perdue, X. Qian, P. U. Sauer, R. Skibiński, S. Stave J. R. Tompkins, H. R. Weller, H. Witała, Y. K. Wu, Y. Zhang, W. Zheng

The first measurement of the three-body photodisintegration of longitudinally-polarized ^3He with a circularly-polarized \gamma-ray beam was 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 contributions from the three-body photodisintegration to the ^3He GDH integrand are presented and compared with state-of-the-art three-body calculations at the incident photon energies of 12.8 and 14.7 MeV. The data reveal the importance of including the Coulomb interaction between protons in three-body calculations.

View original: http://arxiv.org/abs/1304.5442