团簇现象广泛存在于物理学中的各个领域，核物理中的团簇结构引起了国际上的广泛关注。轻核的团簇结构在原子核中的玻色—爱因斯坦凝聚、低密核物质状态方程及核天体物理中元素的合成过程等方面都扮演着重要角色。开展原子核团簇结构研究，对于深入理解原子核内部结构和核力，以及宇宙中元素的组成均具有重要意义。当前，不同理论和实验研究对12C的Hoyle态及其团簇结构仍存在较大争议。本项目提出通过4He与C靶的非弹性散射来研究12C的Hoyle态及其团簇结构。实验采用双面Si条探测器和高纯锗探测器符合测量3α粒子及相应的γ射线，重构出12C*的激发能谱，并鉴别出Hoyle态及其它激发态。结合Dalitz图及3α粒子相对能量分布，研究这些激发态的团簇结构，并为相关理论模型提供可靠的实验依据。

The cluster phenomena exist widely in various fields of physics. The cluster structure in nuclear physics has attracted wide attention in the world. The cluster structures of light nuclei play an important role in the Bose-Einstein condensates in nuclei, the nuclear equation of state of nuclear matter at low densities and temperatures, and nucleosynthesis process in nuclear astrophysics. The study of the nuclear cluster structure is of great significance for further understanding of the internal structure, nuclear force and the composition of elements in the universe. Currently, there is still great controversy in both theoretical and experimental investigations for the Hoyle state and its cluster structure in 12C. In this proposal, we study the Hoyle state and its cluster structure in 12C, using the inelastic scattering of 4He on C target. In experiments, the double-sided Si strip detector and the high-purity germanium detector will be used to perform a coincidence measurement between 3α particles and the corresponding γ rays. The excitation energy spectrum of 12C* will be constructed to identify the Hoyle state and the other excited states. With the analysis of Dalitz plot and the relative energies of 3α particles, to study the cluster structures of these states and provides reliable experimental evidence for theoretical models.