Experimental fission cross-sections are reported for the ¹⁹F + ^194,196,198Pt reactions populating an isotopic chain of compound nuclei comprising both closed and non-closed shell nuclei. The fission cross-sections are obtained at near and above Coulomb barrier energies by measuring fission fragment angular distributions. The present work aims to estimate nuclear dissipation and find its isotopic and shell closure dependence from statistical model (SM) analysis of experimental data. Pre-scission neutron multiplicity data for the same systems is also included in the SM analysis. An updated version of SM is used in the present analysis, which includes shell corrections in level density and fission barrier as well as the effect of collective enhancement of level density and orientation effect of the compound nucleus along the symmetry axis. An isotopic dependence of the dissipation strength fitting the fission excitation functions is observed. The pre-scission neutron multiplicity, however, is underestimated by the SM.

报告了¹⁹ F + ^{194,196,198 的}实验裂变截面Pt 反应填充复合核的同位素链，包括封闭和非封闭壳核。通过测量裂变碎片角分布，在接近和高于库仑势垒能量时获得裂变横截面。目前的工作旨在估计核耗散，并从实验数据的统计模型 (SM) 分析中找到其同位素和壳闭合依赖性。SM 分析中还包括了相同系统的预裂中子多重性数据。本分析中使用了 SM 的更新版本，其中包括能级密度和裂变势垒方面的壳修正，以及复合核沿对称轴的能级密度和取向效应的集体增强效应。观察到拟合裂变激发函数的耗散强度的同位素依赖性。然而，SM 低估了断裂前的中子多样性。