论文标题
质子和α非弹性散射的微观耦合 - 通道计算$ 4^+_ 1 $和$ 4^+_ 2 $状态$^{24} $ mg
Microscopic coupled-channel calculation of proton and alpha inelastic scattering to the $4^+_1$ and $4^+_2$ states of $^{24}$Mg
论文作者
论文摘要
背景：K = 0+和K = 2+带的三轴和六二核变形已通过各种探针的非弹性散射（包括电子，质子和质子和α颗粒）长时间。但是，解释通过反应计算观察到的$ 4^+_ 1 $状态的散射的独特特性一直是一项挑战。目的：研究24mg的K = 0+和K = 2+条带的结构和过渡性能，该特性通过无弹性质子和α散射的微观结构和反应计算。特别是，重新审查了E4过渡到$ 4^+_ 1 $和$ 4^+_ 2 $状态。方法：在反对称分子动力学（AMD）的框架中，使用奇偶校验和总角度动量投影计算了24mg的结构。通过微观耦合通道（MCC）方法计算非弹性质子和α反应，通过将墨尔本G-Matrix NN与AMD密度折叠的相互作用折叠，以24mg的速度折叠。结果：在结构的性质上获得了合理的结果，包括k = 0+和k = 2+频段的能量光谱和E4和E4跃迁，这是由于三亚型变形的集体增强。 MCC+AMD计算成功地重现了$ 4^+_ 1 $和$ 4^+_ 2 $质子散射的$ 4^+_ 1 $的角度分布，$ e_p $ = 40--100mev和$e_α$ = 100-400-400-400-400mev。结论：这是第一个描述$ 0^+_ 1 \至4^+_ 1 $ transition的独特属性的微观计算。在$ 4^+_ 1 $状态的无弹性散射中，$ 0^+_ 1 \ to 2^+_ 1 \至4^+_ 1 $过渡的主要两步过程，而解构干扰是弱的单步过程。
Background: The triaxial and hexadecapole deformations of the K=0+ and K=2+ bands of 24Mg have been investigated by the inelastic scatterings of various probes, including electrons, protons, and alpha particles, for a prolonged time. However, it has been challenging to explain the unique properties of the scatterings observed for the $4^+_1$ state through reaction calculations. Purpose: To investigate the structure and transition properties of the K=0+ and K=2+ bands of 24Mg employing the microscopic structure and reaction calculations via inelastic proton and alpha-scattering. Particularly, the E4 transitions to the $4^+_1$ and $4^+_2$ states were reexamined. Method: The structure of 24Mg was calculated employing the variation after the parity and total-angular momentum projections in the framework of the antisymmetrized molecular dynamics(AMD). The inelastic proton and alpha reactions were calculated by the microscopic coupled-channel (MCC) approach by folding the Melbourne g-matrix NN interaction with the AMD densities of 24Mg. Results: Reasonable results were obtained on the properties of the structure, including the energy spectra and E2 and E4 transitions of the K=0+ and K=2+ bands owing to the enhanced collectivity of triaxial deformation. The MCC+AMD calculation successfully reproduced the angular distributions of the $4^+_1$ and $4^+_2$ cross sections of proton scattering at incident energies of $E_p$=40--100MeV and alpha-scattering at $E_α$=100--400MeV. Conclusions: This is the first microscopic calculation that described the unique properties of the $0^+_1\to 4^+_1$ transition. In the inelastic scattering to the $4^+_1$ state, the dominant two-step process of the $0^+_1\to 2^+_1\to 4^+_1$ transitions and the deconstructive interference is the weak one-step process were essential.
