Almost complete transparency of theα+C12system at sub-barrier energies

Theoretical Photo-Disintegration of16O

“…= −0.245 MeV) leads to the enhancement of the low-energy S -factor, which dominates the resultant reaction rates. The recent experimental results [10,11] of the γ-ray angular distribution appear to advocate the weak coupling mechanism, and they seem to be made from the interference between two α+ 12 C molecular states [2,3]. The reaction rates are concordant with those from the strong coupling mechanism of the previous R-matrix analysis, because the total S -factors are comparable at E c.m.…”

“…The capture cross section is given as σ αγ ∝ ⟨ϕ f |ẽM E λ |ϕ i ⟩ 2 , where M E λ is the electric operator of Eλ transition. To generate the scattering state ϕ i , I use the potential describing elastic scattering [3,6,7]. The α+ 12 C cluster structure in 16 O is semi-classically defined by the evaluation of refractive scattering [8,9].…”

α+12C rotational bands in16O

“…= 5 MeV [10,12] is also obtained (figure 2). The potential in the present study seems to be comparable to the folding potential with the M3Y interaction [7,11,13,14]. Figure 3 indicates the volume integrals J R of the real part of the potential as a function of incident energies.…”

“…The solid squares indicate the present results. At low energies, we find the different strength of the potentials, labeled by P3, P4 and P5, which originates from the difference of n in χ N (r) [7]. However, this ambiguity is known to be eliminated by evaluating the experimental data at high energies that lead to a semi-classical description of the quantum system (e.g.…”

“…We determined the potential so as to minimize the difference between the calculated a e-mail: mkatsuma@sci.osaka-cu.ac.jp values and the experimental data of the cross sections and phase shifts for α+ 12 C elastic scattering [7,11]. The resultant potential can reproduce the characteristic feature of the experimental data [5,12], i.e.…”