Asymmetry-dependent radius effects on the decay dynamics of Sn-isotopes formed in α-induced reactions using DCM model

Department of Physics, Panjab University, Chandigarh - 160014, INDIA

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Published online: 5 March 2026

Abstract

Extending the results from our earlier investigation of N/Z driven structural effects on the decaying ^110,114,12°Sn* isotopes formed in α-induced reactions on Cd targets at common center of mass energy 15 MeV (approx.), the present work focuses on the inclusion of isospin asymmetry (I) in nuclear radius expression and consequently its effects on the decay characteristics. The isotopes under consideration possess noticeably different I=(N-Z)/A values i.e. 0.091 for lighter isotope ¹¹⁰Sn* and 0.167 for heavier isotope ¹²⁰Sn* and hence it will be interesting to explore the influence of isotope asymmetry dependent radius R(I) on their decay behavior. The modified radius parameterization is investigated for modifications in the fragmentation potential landscape, barrier profiles and barrier positions for the decay of the chosen isotopes. A significant alteration in the barrier height and barrier position is observed for the neutron rich isotope ¹²⁰Sn* when the usually used mass dependent radius R(A) is replaced with R(I). These variations in barrier profiles consequently reflect in the preformation and barrier penetration profiles. The reformulations in fragmentation behavior suggests that the minimal changes in radius terms have the tendency to induce significant variations in the structural choices of the decaying systems. Discernible modifications in the preformation probability values of alpha and other clusters are observed when isospin asymmetry is included in radius terms. This observation underlines the sensitivity of decay dynamics of nuclei formed in alpha induced reactions towards geometric corrections to radial terms. The outcome of the study emphasizes the important role of isospin asymmetry in configuring the fragmentation aspects of Sn isotopes in low energy nuclear reactions.