多核子转移反应64Ni+238U类弹产物中9/2+同核异能态的研究

单粒子轨道是当前人们理解核结构的基础。它随质子数和中子数的变化而变化，从而导致传统幻数的消失和新幻数的出现。一个典型的例子就是“反转岛”的出现。在N≈40“反转岛”的形成中，中子g9/2轨道起着至关重要的作用。本项目利用粒子-γ(-γ)符合技术寻找多核子转移反应64Ni+238U类弹产物中的9/2+同核异能态，并测量它们的激发能和半衰期。通过补全关键能级，比如丰中子核63Fe中9/2+同核异能态的实验数据，来系统研究中子g9/2轨道有效单粒子能级的演化，以此深入理解该轨道在N=40幻数出现和消失背后所扮演的角色，并探寻N≈40“反转岛”西部的边界。

Single-particle energy is the cornerstone of the present understanding of nuclear structure. It changes as a function of neutron and proton number and thus leading to the disappearance of the traditional magic numbers and the appearance of new ones. One typical example is the emergence of the “island of inversion”. Neutron g9/2 orbital plays a crucial role in the formation of the “island of inversion” at N≈40. Based on the particle-γ(-γ) coincidence method, we propose to search the 9/2+ isomers in the target-like fragments in the multinucleon transfer reactions of 64Ni+238U and carry out measurements of isomeric excitation energies and half-lives. Through supplementary experimental data on key levels, such as the 9/2+ isomeric state in neutron-rich nucleus 63Fe, we can perform a systematic study of the evolution of the effective single-particle energies of the neutron g9/2 orbital, to have a deep understanding of the role played by the g9/2 orbital in the appearance and disappearance of the N=40 magic number and to explore the western boundary of the N≈40 “island of inversion”.