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

Abstract

The first measurement of the three-body photodisintegration of longitudinally-polarized ^3He with a circularly-polarized γ-ray beam was carried out at the High Intensity γ-ray Source (HIγS) 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.

5 pages, 3 figures, accepted in Physical Review Letters

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Cited by in corpus (4)

• Optically Polarized ${}^3$He
• Nucleon Polarizabilities: from Compton Scattering to Hydrogen Atom
• Measurement of the Doubly-Polarized $\overrightarrow{{}^{3}He}(\vec{\gamma },n)pp$ Reaction at 16.5 MeV and Its Implications for the GDH Sum Rule
• First Measurement of the Asymmetry and the Gerasimov-Drell-Hearn Integrand from $\overrightarrow{{}^{3}He}(\vec{\gamma },p)d$ reaction at the Incident Photon Energy of 29 MeV