Quaternary Fission of Various Z = 120 Isotopes Accompanied by Two α Particles as Light Charge Particles

Abstract

Spontaneous quaternary fission accompanied by two α particles for isotopes ³⁰⁴120 in both equatorial and collinear configurations, and for ^298,302120 in the equatorial configuration has been studied using Coulomb and proximity potential model with the inclusion of deformation and orientation of fragments. The most favourable quaternary fission channel is determined using cold reaction valley and relative yield plots. In the case of ³⁰⁴120, the equatorial emission of light charge particles displays distinct peaks, reaching a peak relative yield of approximately 33.65%. In contrast, collinear emission shows continuous peaks with a maximum relative yield around 1.27%. The peak relative is attributed to the presence of nuclei ¹²¹In for equatorial emission, and ¹²²I, ¹⁹²Au, ⁹⁷Ru and ⁴²Cl for collinear emission. For the parent isotopes ³⁰²120 a peak relative yield around 19.44% is obtained for combination containing nuclei ¹²²Ag, whereas in the case of ²⁹⁸120, fission channels result in a maximum relative yield of approximately 22.08% with one fragment as ¹²²Ag. The mentioned nuclei are found to possess either a magic number of protons or neutrons leading to shell closure. In addition to closed shell effect, the inclusion of deformation factors β_2, β₄ and orientation of fragments have a prominent role in determining the relative yield of a particular fission channel.