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

A.C.Fonseca; A.Deltuva; B.A.Perdue; B.Lalremruata; C.Peng; D.Dutta; G.Laskaris; H.Gao; H.J.Karwowski; H.R.Weller

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

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arxiv 1304.5442 v1 pith:5CN7CY64 submitted 2013-04-19 nucl-ex

First Measurements of Spin-Dependent Double-Differential Cross Sections and the GDH Integrand from vec{³He}(vec{γ},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

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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.Skibi\'nski S.Stave J.R.Tompkins H.R.Weller H.Wita{\l}a Y.K.Wu Y.Zhang W.Zheng

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keywords three-bodycalculationscrossdouble-differentialenergiesfirstgammagamma-ray

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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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