论文标题
$ e2 $过渡强度到2 $^+_ 1 $状态的精确度量的$^{12} $ c状态
Precision measurement of the $E2$ transition strength to the 2$^+_1$ state of $^{12}$C
论文作者
论文摘要
$^{12} $ c的电磁激发至其2 $^+_ 1 $状态的外形因素在S-Dalinac的电子散射实验中以极低的动量传输进行了测量。与世界形式数据的组合分析导致过渡强度$ b（e2; 2^+_ 1 \ rightarrow 0^+_ 1）= 7.63（19）$ e $^2 $ fm $^4 $，精度提高到2.5 \％。中等内核壳模型的结果与手性有效场理论得出的相互作用能够重现结果。四杆力矩$ q（2^+_ 1）= 5.97（30）$ efm $^2 $可以从与$ b（（E2）$强度在计算中出现的严格关联中提取。
The form factor of the electromagnetic excitation of $^{12}$C to its 2$^+_1$ state was measured at extremely low momentum transfers in an electron scattering experiment at the S-DALINAC. A combined analysis with the world form factor data results in a reduced transition strength $B(E2; 2^+_1\rightarrow 0^+_1) =7.63(19)$ e$^2$fm$^4$ with an accuracy improved to 2.5\%. In-Medium-No Core Shell Model results with interactions derived from chiral effective field theory are capable to reproduce the result. A quadrupole moment $Q(2^+_1) = 5.97(30)$ efm$^2$ can be extracted from the strict correlation with the $B((E2)$ strength emerging in the calculations.
