Jacques Raynal seminal contributions to the optical model development and numerical implementation of the solution of coupled-channel equations have been key to generate nuclear data for applications in the last three decades. We recall some of the interactions we had with Jacques from late nineties up until his death. His ECIS code was for a long time, since his collaboration with Peter Moldauer in early eighties, the only optical model and compound decay code where Engelbrecht–Weidenmüller transformation was implemented to consider the impact of strongly coupled channels with large direct inelastic cross sections on the decay of the compound channel. Such physical effect, which was neglected for a long time, proved very important to describe the observed enhancement (Relative to the bare Hauser–Feschbach calculation) of the inelastic scattering cross section on \(^{238}\)U nucleus, which is a major fuel component in nuclear power reactors. Jacques also proposed an unique and very clever method to calculate dispersive integrals analytically in 1996. His excellent mathematical background and programming skills set a very high bar for future generations. This contribution represents a small homage to our dear colleague and friend.

Jacques Raynal 对耦合通道方程解的光学模型开发和数值实现的开创性贡献一直是过去三年中为应用生成核数据的关键。我们还记得从 90 年代末到他去世时我们与雅克的一些互动。自从 80 年代初与 Peter Moldauer 合作以来，他的 ECIS 代码在很长一段时间内都是唯一的光学模型和复合衰减代码，其中实施了 Engelbrecht-Weidenmüller 变换以考虑具有大的直接非弹性横截面的强耦合通道对复合通道衰减。这种长期被忽视的物理效应，\(^{238}\) U 核，是核动力反应堆的主要燃料成分。Jacques 还在 1996 年提出了一种独特且非常聪明的方法来解析计算色散积分。他出色的数学背景和编程技巧为后人设定了很高的标准。这一贡献是对我们亲爱的同事和朋友的一点敬意。