2025/02/12 by Ando, Shing-Ichi
Medicine · Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Medical Imaging Techniques and Applications #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2502.08190
openalex publication_date 2025/02/12 · openalex created_date 2025/02/15 · openalex updated_date 2026/07/28
Elastic α-12C scattering for l=2 and E2 transition of radiative α capture on 12C, 12C(α,γ)16O, are studied in cluster effective field theory. Due to the problem in fixing the asymptotic normalization coefficient (ANC) of the subthreshold 21+ state of 16O, equivalently, the effective range parameters of the 21+ state, from the elastic scattering data, we introduce the conditions that lead to a large value of the ANC. In addition, d-wave phase shift data of the elastic scattering up to the α energy, Eα=10~MeV, which contain resonant 24+ state of 16O, are also introduced in the study. Applying the conditions, the parameters of the S matrix of the elastic scattering for l=2 are fitted to the phase shift data, and the fitted parameters are employed in the calculation of astrophysical SE2 factor of 12C(α,γ)16O; we extrapolate the SE2 factor to the Gamow-peak energy, EG=0.3~MeV. We find that the conditions lead to significant effects in the observables of the 24+ state of 16O and the estimate of the SE2 factor at EG and confirm that the ANC of the 21+ of 16O cannot be determined by the phase shift data for l=2.