Isospin symmetry has gained importance in nuclear phenomena involving heavy nuclei in recent years. We present empirical evidence of isospin dependence in the compound nuclear fission cross-sections and fission widths, which suggests the idea that the compound nucleus (CN) possibly retains the memory of the isospin when it is formed and affects the CN fission. This idea was first proposed by E.L. Yadrovsky [E.L. Yadrovsky, Phys. Lett. 55B, 157 (1975)]. An observable difference between the fission branching ratios in two different isospin states suggests that the CN seems to remember its isospin at the point of formation. Further, the data also suggest a possible new signature of weakening of the CN process and gradual transition to non-compound processes as the energy rises. This is a very interesting and useful observation which needs to be confirmed by further and more precise experiments.

近年来，同位旋对称性在涉及重核的核现象中变得越来越重要。我们提供了在复合核裂变截面和裂变宽度中等旋异构体依赖性的经验证据，这表明复合核（CN）可能在形成时影响了同核旋异构体并影响了CN裂变的构想。这个想法最初是由EL Yadrovsky [EL Yadrovsky，Phys。来吧 55B，157（1975）]。在两种不同的等旋旋态中，裂变分支比之间的可观察到的差异表明，CN似乎在形成点记住了其等旋旋。此外，数据还表明，随着能量的增加，CN过程减弱和逐渐过渡到非化合物过程的可能新信号。这是一个非常有趣且有用的观察结果，需要通过进一步更精确的实验加以证实。