Microscopic Cluster Study of the ^(10)Be Nucleus  

10Be原子核微观团簇结构研究

作　　者：CAO Yingyu TAO Deye ZHOU Bo 曹颖逾;陶德晔;周波(复旦大学现代物理研究所,上海200433;国家自然科学基金理论物理专款-复旦大学上海核物理理论研究中心,上海200438)

机构地区：[1]Institute of Modern Physics,Fudan University,Shanghai 200433,China [2]Shanghai Research Center for Theoretical Nuclear Physics,NSFC and Fudan University,Shanghai 200438,China

出　　处：《原子核物理评论》2024年第1期148-155,共8页Nuclear Physics Review

基　　金：国家重点研发计划项目(2022YFA1602402);上海市"科技创新行动计划"自然科学基金项目(21ZR1409500)。

摘　　要：Using a microscopic four-body cluster model,we investigate the spectral properties and structural configurations of the ^(10)Be nucleus.We calculate physical quantities such as the root-mean-squared(r.m.s.)radii and electromagnetic transition strengths.The theoretical results for the energies and certain electromagnetic transition strengths of the low-lying states show good agreement with experimental data.In particular,the enhancement of the r.m.s.radius and isoscalar monopole transition strength of the O_(3)^(+) state indicates a well-developed cluster structure.We obtained three 1-states in E_(x)<15 MeV that show remarkable dipole transition strengths,suggesting that the 1-states may have cluster structure.Using the obtained wave functions,we calculate the reduced-width amplitudes(RWAs)to investigate the SHe+α and'Be+n two-body cluster structures in ^(10)Be.The results suggest that the lowlying states show the two-body ^(6)He+α and ^(9)Be+n configuration,with the ^(6)He+α components of the two-body structure diminishing as the energy increases,which due to the breakup of He and ^(9)Be at higher excitation energies.Moreover,a few states above the α+α+n+n threshold still exhibit significant 9Be+n components.使用微观四体簇模型,研究了^(10)Be原子核的能谱和团簇结构。计算了物理量,如均方根(r.m.s.)半径和电磁跃迁强度。低能态的能量和某些电磁跃迁强度的理论结果与实验数据吻合良好。我们的计算显示0_(3)^(+)有显著的半径和标量单极子跃迁强度,这些性质表明0_(3)^(+)态有明显的团簇结构。在激发能Ex<15 MeV范围内得到三个1^(-)态,这些态表现出显著的偶极子跃迁强度,暗示了1^(-)态可能存在团簇结构。利用获得的波函数,计算了约化宽度振幅(RWAs)以研究^(6)He+α和^(9)Be+n在10Be的两体团簇结构。RWAs的结果表明,在10Be低能态中存在^(6)He+α和^(9)Be+n的两体结构,但随着能量升高,^(6)He+α的成分会减小,这可能是由于^(6)He和^(9)Be在较高激发能量下会破裂。此外,有少量高于α+α+n+n阈值的态依然存在显著9Be+n组分。

关 键 词：cluster model cluster structure electromagnetic transition strengths 

分 类 号：O571.6[理学—粒子物理与原子核物理]