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

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

doi:10.1103/physrevlett.110.202501

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arXiv · 1304.5442

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

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Abstract

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.

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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. 2013-04-19. First Measurements of Spin-Dependent Double-Differential Cross Sections and the GDH Integrand from \vec{^3He}(\vec{\gamma},n)pp at Incident Photon Energies of 12.8 and 14.7 MeV. https://doi.org/10.1103/physrevlett.110.202501

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