Target asymmetry measurement of deuteron photodisintegration at a photon energy of 550 MeV

Polarization observables?,P y ,T 1 in the reaction $$\vec \gamma d \to \vec pn$$ at photon energies between 200 and 600 MeV and dibaryon resonances

“…As a resuit, two solutions providing a fair description of those data were obtained with different DR sets, corresponding to the quantum numbers I(JP)=I(3-) § +) and I(3 )+ O(3 +). However, these solutions are not in agreement with measurements of Z-[3, 4,5] and T-asymmetries [6,7].…”

“…[ Since for the vertex function (1) we have ka Fu (Td-~d) = (M 2 -s) (U'U) (6) any Qd value satisfies the requirement of electromagnetic current conservation.…”

“…(249 points from [4,45]), the asymmetry due to the photon linear polarization Z" (1181 points from [3, 4,5,16]), the proton polarization P~, (76 points from [1,2,16,30,35], and the Tasymmetry due to the deuteron vector polarization (35 points from [6,7]) both by using the model without DR (the amplitudes correspond to the diagrams a to d in Fig. 2B) and the model with different sets of DR included (the amplitudes correspond to all the diagrams in Fig.…”

“…The photon beam was formed by an array of cleaning magnets (4) and collimators (5) on a liquid deuterium target (6), which was 200 mm in length along the beam axis and 40 mm in diameter [22]. The intensity of the beam from the 2 mm thick diamond single crystal was measured to be 2-101~ at a collimation angle Qe= 5-10 -4 tad.…”

“…The investigation of polarization observables in the deuteron photodisintegration reaction together with the pp--*pp, rrd--*~zd, rrd~pp, #d--*rc~ processes provides information on dibaryon resonances (DR) and the quark structure of the deuteron [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The advantage of the deuteron photodisintegration reaction lies in the possibility of exciting states with the isospin I= 0 and L The nucleon resonance excitation in the intermediate state,…”