Spectroscopic quadrupole moments in Xe 124
Spectroscopic quadrupole moments in Xe 124
复制标题
Xe 124 中的光谱四极矩
DOI：
10.1103/physrevc.107.014324
复制
发表时间：
2023
影响因子：
3.1
通讯作者：
Clément E
中科院分区：
文献类型：
--
作者：
Clément E
背景：壳层闭合点以上的四价质子的同位素链是研究核形变演化的理想实验室。在壳层闭合处，给出了球形双闭合壳层核的所有特征。在很缺中子的同位素中，研究了~（120）C的衰变链，以探讨滴线附近的放射性衰变性质和~（120）C的磁性。此外，在核形变中，氘同位素呈现出更高的对称性，如稳定同位素中的八极自由度和O（6）对称性。目的：通过测量第一激发态的光谱四极矩，研究O（6）对称性的相关性。在O（6）对称极限下，集体态的光谱四极矩为零。方法：在GANIL装置上，用能量为MeV和MeV的稳定束轰击靶。激发态通过安全的库仑激发反应填充。低能大质量重离子的碰撞使该反应对激发态的对角矩阵元敏感。用磁谱仪和AGATA跟踪阵列探测反冲。结果：旋转基态能带被填充到态以及态的过渡矩阵元素和对角矩阵元素。用高精度的光谱数据来约束thegosiafit，光谱四极矩的，和状态的首次测定。结论：光谱四极矩被发现是负的，大的，和恒定的基态带下面的长轴变形的基态带。目前的实验数据证实了O（6）对称性基本上是破缺的。
Background:The Xe isotopic chain with four valence protons above theshell closure is an ideal laboratory for the study of the evolution of nuclear deformation. At theshell closure,presents all characteristics of a doubly closed shell nucleus with a spherical shape. In the very neutron-deficient isotopes close to, the-decay chain of Xe was investigated to probe the radioactive decay properties near the drip-line and the magicity of. Additionally, the Xe isotopes present higher order symmetries in the nuclear deformation such as the octupole degree of freedom nearandor O(6) symmetry in stable isotopes.Purpose:The relevance of the O(6) symmetry has been investigated by measuring the spectroscopic quadrupole moment of the first excited states in. In the O(6) symmetry limit, the spectroscopic quadrupole moment of collective states is expected to be null.Method:A stablebeam with energies ofMeV andMeV was used to bombard atarget at the GANIL facility. Excited states were populated via the safe Coulomb excitation reaction. The collision of the heavy ions with a largeat low energy make this reaction sensitive to the diagonalmatrix element of the excited states. The recoils were detected in themagnetic spectrometer and therays in the AGATA tracking array. The least squares fitting codegosiawas used for the analysis to extract bothandtransitional anddiagonal matrix elements.Results:The rotational ground state band was populated up to thestate as well as theandstates. Using high precision spectroscopic data to constrain thegosiafit, the spectroscopic quadrupole moments of the,, andstates were determined for the first time.Conclusions:The spectroscopic quadrupole moments were found to be negative, large, and constant in the ground state band underlining the prolate axially deformed ground state band of. The present experimental data confirm that the O(6) symmetry is substantially broken in.