【摘要】 寻找原子核拉长态的主要兴趣在于它是一个纯核壳模型组态,它常常被用来定义相应的组态空间大小,确认多核子壳模型计算中的剩余相互作用,并且在全微观三核子转移反应DWBA分析中提供好的波函数。实验上观测到的纯壳模波函数并不多,主要是在一些较轻的核上观测到的,此工作的主要目的是在中等重核上观测寻找原子核拉长态。利用ΔE-E望远镜及北京Q3D磁谱仪系统,在HI-13串列加速器提供的35MeVα离子轰击下,测量了⁵⁶Fe（α,d）⁵⁸Co核反应的精细能谱和微分截面角分布。借助全微观DWBA理论分析,相应于核反应俘获的p-n核子对具有(1g_9/2)²的组态,观测到迄今所能看到的最高拉长态(1g_9/2,1g_9/2)₉。还对6.4MeV高激发能级核反应截面的反常增强,p-n核子对耦合成最小角动量的实验证据进行了讨论（这一点在s-d壳核上至今未看到）,并且首次确认了6.4MeV能级的自旋宇称J^π=1⁺。更多还原

【Abstract】 The interest of the search for the stretched state stems largely from the fact that these states are usually considered to be of fairly pure nuclear shell model configuration and often used to help define the appropriate configuration space, determine the proper residual interaction in the multi-particle shell model calculation and provide a good wave function for study of three nucleon transfer reaction with fully microscopic DWBA analyses. Actually, only a few pure shell model configurations have been observed in some light nuclei so far. One intends to search for the existence of the stretched state in medium mass. The fine spectra and the angular distributions of differential cross-section strongly excited by 35 MeV a ion bombardment in 56Fe(a,d)58Co reaction in HI-13 Tandem Accelerater in terms of AE-E telescope and Beijing Q3D magnetic spectrometer have been measured. The stretched state for 6. 79 MeV 9+ with the highest (ng9/2 ,u g9/2) configuration was identified and the 6. 4 MeV high-lying level was newly assigned to be 1+ state in 58Co.更多还原