丰中子核的中子皮厚度是重要的物理量，对研究核对称能/滴线附近的极限丰中子核等问题具有重要意义。美国2015核科学长期规划把48Ca的中子皮厚度研究作为重点课题。理论发现炮弹碎裂反应中的镜像核产额比对炮弹核的中子皮厚度敏感。我们将在HIRFL-RIBLL1利用58Ni主束产生42,44,46,48Ca次级束并测量它们的炮弹碎裂反应产生中等质量余核(从Li到O)的截面，利用镜像核的产额比提取丰中子Ca同位素的中子皮厚度，尤其是48Ca的中子皮厚度。同时从理论和实验上研究中子皮厚度在丰中子核中随中子丰度增加的变化规律。

Neutron skin thickness is an important parameter, which is important the study of nuclear physics and very neutron-rich nucleus located at the drip line. The long range plan for Nuclear science has taken the research on the neutron-skin thickness of 48Ca as a very important question. Theoretically it is found that the isobaric ratio for mirror nuclei is sensitive to the neutron-skin thickness of projectile in projectile fragmentation reaction. An experimental measurement for the fragment (from Li to O) yields in the 42,44,46,48Ca projectile fragmentation reaction is planned to be performed using HIRFL-RIBLL1, and the neutron-skin thickness of the neutron-rich calcium isotopes will be extracted from the isobaric ratio, especially for 48Ca. The evolution of neutron-skin thickness in the neutron-rich calcium isotopes will be studied both theoretically and experimentally.