The Analyzing Power of the¹²C(γ,p) Reaction Measured Using Tagged Polarized Photons

CROSS SECTION ASYMMETRY OF THE 12C(γ,p0)11B AND 12C(γ,p1)11B REACTIONS AT PHOTON ENERGIES 40...55MeV

“…The quasi-deuteron model predicts another energy dependence of the asymmetry than RPA, close to the free deuteron photodisintegration, but ∼ 15...20% higher than the experimental data for free deuteron disintegration [15,16]. [25] for the sum of E ex < 5 M eV . Right: Asymmetry of the 12 C(⃗ γ, p 2−6 ) 11 B reactions averaged over three runs CH 2 targets.…”

“…Right: Asymmetry of the 12 C(⃗ γ, p 2−6 ) 11 B reactions averaged over three runs CH 2 targets. Circles are the J.Yokokawa et al, [25] for the sum of E ex > 5 M eV , triangles (up) and (down) are the data [22] and [13] on the d(⃗ γ, p)n reactions. Curves are prediction by the RPA theory (solid lines) and quasi-deuteron model (dashed lines) [25] As a whole, such behavior of the asymmetry agree with suggestion about the 2h − 1p character of the E ex = 5.02 and 6.74 M eV states and dominating the two-body mechanisms of the (γ, p) reactions in this case, which can decrease the asymmetry value in comparison with the one-body mechanism.…”

“…In Fig. 16 [25] for the sum of E ex > 5 M eV , triangles (up) and (down) are the data [22] and [13] on the d(⃗ γ, p)n reactions. Curves are prediction by the RPA theory (solid lines) and quasi-deuteron model (dashed lines) from [25] Because the two-body mechanism gives less asymmetry, the asymmetry of the 12 C(γ, p 1 ) 11 B reaction should be less that is confirmed by the experimental results, as can be seen in Fig.…”

“…Left: Asymmetry of the12 C(⃗ γ, p 01 ) 11 B reactions averaged over three runs and CH 2 and CD 2 targets. Circles are the data J.Yokokawa et al[25] for the sum of E ex < 5 M eV . Right: Asymmetry of the 12 C(⃗ γ, p 2−6 ) 11 B reactions averaged over three runs CH 2 targets.…”

Proton emission induced by polarized photons

“…In the first one, Wienhard et al [12] studied the 16 O( γ, p) 15 N reactions in the giant resonance region by using photons with energies between 15 and 25 MeV. In the other experiment, Yokokawa et al [13] used as a target the 12 C nucleus and the photon energies varied between 40 and 70 MeV.…”