Examining the correlation between multi-neutron transfer and inelastic excitations in sub-barrier fusion enhancement

作者：Anjali Rani, S. Mandal, Kajol Chakraborty, Ruchika Gupta, C.V. Ahmad, A. Parihari, Dharm Chand Vishwakarma, P. Khandelwal, Preeti Rawat, Phurba Sherpa, Suresh Kumar, N. Madhavan, S. Nath, J. Gehlot, Rohan Biswas, Gonika, Chandra Kumar, Shoaib Noor, Ankita Vinayak · 发表于：Physical Review C · 年份：2022 · DOI：10.1103/physrevc.106.064606 · 被引用次数：16 · 研究领域：Nuclear physics research studies、Nuclear Physics and Applications、Nuclear reactor physics and engineering

Background: Heavy-ion fusion cross-sections at sub barrier energies are found to be enhanced by orders of magnitude as compared to the predictions of one-dimensional barrier penetration model (1-D BPM). The coupling of various internal degrees of freedom has been employed to decrypt the mechanism responsible for the observed sub-barrier fusion enhancement. However, the unambiguous role of multi-neutron transfer channels in the sub-barrier domain is still elusive.Purpose: We aim to explore and disentangle the effects of multi-neutron transfer channels from the inelastic excitations in the vicinity of the Coulomb barrier.Method: The fusion excitation functions for $^{28}\mathrm{Si} + ^{116,120,124}\mathrm{Sn}$ systems were measured from $\ensuremath{\approx}14%\phantom{\rule{0.222222em}{0ex}}$ below to $\ensuremath{\approx}15%\phantom{\rule{0.222222em}{0ex}}$ above the Coulomb barrier by detecting the evaporation residues (ERs) at the focal plane of the Recoil Mass Separator (RMS), Heavy Ion Reaction Analyzer (HIRA) at the Inter-University Accelerator Centre (IUAC), New Delhi.Results: The extracted fusion cross sections for the investigated systems at sub-barrier energies are significantly enhanced as compared to the predictions of 1-D BPM calculations. To probe the underlying mechanism responsible for the observed sub-barrier fusion enhancement, the coupled-channels (CC) formalism was employed. Coupled reaction channels (CRC) calculations by incorporating the one-neutron trans...