2025/09/18 by Ohkubo, S., Hirabayashi, Y.
#FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2509.14535
We report, for the first time, the emergence of a secondary bow with ripples in 12C+12C nuclear rainbow scattering. This finding was achieved by studying the experimental angular distributions in 12C+12C scattering at incident energies EL= 240 and 300 MeV, utilizing an extended double-folding model. This model accurately describes all diagonal and off-diagonal coupling potentials derived from the microscopic wave functions for 12C. Although the observed angular distributions of rainbow scattering at large angles (approaching 90^∘) are complicated by the symmetrization of two identical bosonic nuclei, the Airy minimum, associated with a dynamically generated secondary bow with ripples, is clearly identified at approximately 77^∘ for 240 MeV in the fall-off region of the primary nuclear rainbow. This finding, along with previous findings in the 16O+12C and 13C+12C systems, reinforces the concept of a secondary bow in nuclear rainbow scattering.