Michał Warda,波兰卢布林居里夫人大学教授，博士生导师，波兰物理学会核物理分会主席。1999年博士毕业于波兰居里夫人大学，曾先后在波兰居里夫人大学，西班牙马德里自治大学，西班牙巴塞罗那大学等从事博士后研究员工作。1999年起任职于波兰居里夫人大学，物理研究所。研究领域主要包括原子核的不对称自发裂变，基于HFB理论的超重核的裂变半衰期，裂变碎片质量不对称性，核对称能等。核对称能等相关论文在2010年获得华沙大学，兹德斯瓦夫·谢曼斯基。在Physical Review C, Physics Letter B 等期刊发表论文60余篇，国际会议上作了超过30场奖特邀报告。

报告简介：

Fission is usually described as the process of increasing quadrupole deformation of a nucleus. A very elongated nucleus consists of two pre-fragments connected by a neck. At the critical point of this evolution, a neck breaks up, and two separated fragments are created. This scission point is crucial for determining many observables. Beyond this point, nucleons cannot be exchanged between fission products, and fragment mass distribution can be deduced from the scission configuration. Also, the total kinetic energy of the fragments can be evaluated from the shape of a nucleus during rupture.

A scission point is intuitively defined as a configuration with the neck reduced to a single point connecting two spheroidal fragments. Such a description cannot be directly applied when realistic leptodermous nuclear matter distribution is considered. Tails of surface diffuseness of both fragments overlap even when their mid-density surfaces are separated by a few fm, and the nuclear interaction between fragments does not vanish then. Thus, the precise definition of scission is not straightforward.

In the self-consistent calculations, it is easy to distinguish between pre-scission and two-fragment solutions as a few-MeV drop of energy usually separates them. On the map of the potential energy surfaces, a scission cliff is created. The calculation with additional constraint on a neck parameter can wipe out this discontinuity. Nevertheless, the question of the definition of a scission point remains open. We will discuss how scission configuration can be defined in this approach.