论文标题
$ \ left | t_z \ right | = \ frac {1} {2} $，$ a = 23 $镜像对
Coulomb excitation of the $\left|T_z\right|=\frac{1}{2}$, $A=23$ mirror pair
论文作者
论文摘要
背景：电肢（$ e2 $）的优势与核的潜在四极变形有关，并对许多核理论提出了挑战。 $ n = z $的线附近的镜子核代表了用于测试这种模型中缺陷的方便实验室，利用了系统的isospin对称性。目的：与文学$ e2 $相关的不确定性\ textsuperscript {23} mg是$ t_z = \ left | \ frac {1} {2} {2} \ right | $ nuclei in $ sd $ -shell中最大的。当前工作的目的是提高已知值的精度，以便更好地与理论模型进行比较。方法：$^{23} $ mg和$^{23} $ na的库仑激发测量值在Triumf-ISAC设施中使用Tigress Spectrometer进行。他们被用来确定混合$ e2 $/$ m1 $过渡的$ e2 $矩阵元素。结果：为\ textsuperscript {23} mg和\ textsuperscript {23} na提取了减少的$ e2 $过渡强度，$ b（e2）$。两种同位素的因素约为六个，同时与先前的测量同意，两种同位素的因素都得到了提高。结论：与壳模型和{\ it i a in hibio}价值内相似性重归化组计算进行比较。与先前的研究一致，发现价值空间内相似性 - 纯正组计算的绝对$ E2 $强度。
Background: Electric-quadrupole ($E2$) strengths relate to the underlying quadrupole deformation of a nucleus and present a challenge for many nuclear theories. Mirror nuclei in the vicinity of the line of $N=Z$ represent a convenient laboratory for testing deficiencies in such models, making use of the isospin-symmetry of the systems. Purpose: Uncertainties associated with literature $E2$ strengths in \textsuperscript{23}Mg are some of the largest in $T_z=\left|\frac{1}{2}\right|$ nuclei in the $sd$-shell. The purpose of the present work is to improve the precision with which these values are known, to enable better comparison with theoretical models. Methods: Coulomb-excitation measurements of $^{23}$Mg and $^{23}$Na were performed at the TRIUMF-ISAC facility using the TIGRESS spectrometer. They were used to determine the $E2$ matrix elements of mixed $E2$/$M1$ transitions. Results: Reduced $E2$ transition strengths, $B(E2)$, were extracted for \textsuperscript{23}Mg and \textsuperscript{23}Na. Their precision was improved by factors of approximately six for both isotopes, while agreeing within uncertainties with previous measurements. Conclusions: A comparison was made with both shell-model and {\it ab initio} valence-space in-medium similarity renormalization group calculations. Valence-space in-medium similarity-renormalization-group calculations were found to underpredict the absolute $E2$ strength - in agreement with previous studies.
