Speaker
Description
Back-angle quasi-elastic (QE) scattering provides critical barrier information in massive nuclear reactions leading to the synthesis of superheavy nuclei. The shapes and peaks of QE barrier distributions serve as fingerprints of nuclear structures and reaction dynamics. In this work, we extend the high-accuracy R-matrix method [1] and the finite element method [2-4] to solve the coupled-channels equations for massive systems, which are demonstrated to be more stable than widely used modified Numerov method [5] and allows us to include higher-order vibrational and rotational couplings. Using the reactions 48Ti+208Pb and 51V +248Cm as examples, The calculations shows that higher-order collective excitations significantly smooth the barrier distributions, improving the agreement with experimental data.
References:
[1] Descouvemont, P. (2016). "An R-matrix package for coupled-channel problems in nuclear physics." Computer Physics Communications 200: 199-219.
[2] Wen, P. W., et al. (2020). "Near-barrier heavy-ion fusion: Role of boundary conditions in coupling of channels." Physical Review C 101(1): 014618.
[3] Wen, P. W., et al. (2021). "Potential roots of the deep subbarrier heavy-ion fusion hindrance phenomenon within the sudden approximation approach." Physical Review C 103(5): 054601.
[4] Chuluunbaatar, O., et al. (2022). "KANTBP 3.1: A program for computing energy levels, reflection and transmission matrices, and corresponding wave functions in the coupled-channel and adiabatic approaches." Computer Physics Communications 278: 108397.
[5] Hagino, K., et al. (1999). "A program for coupled-channel calculations with all order couplings for heavy-ion fusion reactions." Computer Physics Communications 123(1–3): 143.
