论文标题
$^7 $ be + $^{12} $ c的弹性和非弹性散射的研究35 meV
Study of elastic and inelastic scattering of $^7$Be + $^{12}$C at 35 MeV
论文作者
论文摘要
$^7 $的弹性和非弹性散射是从$^{12} $ c的，以35 meV的事件能量测量。首次测量了$^{12} $ C的4.439 MEV激发态的无弹性散射。实验数据涵盖了$θ_{cm} $ = 15 $^{\ circ} $ -120 $^{\ circ} $的角范围。使用依赖于密度的M3Y（DDM3Y）有效相互作用，使用木材撒克逊木材和双重折叠电势进行光学模型分析。弹性数据的显微镜分析表明分解通道耦合效果。基于集体形式的非弹性散射的耦合通道分析表明，$^7 $ be和$^{12} $ c的相互激发均明显小于$^{12} $ c的单个激发。从DWBA分析获得的较大变形长度可以通过在耦合通道分析中包括$^7 $的激发来解释。 $^7 $ BE的分手横截面估计小于反应横截面的10 $ \％$。 $^{12} $ c $^*$（4.439 meV）状态为$Δ_2$ = 1.37 fm的固有变形长度。从分析中得出的总反应横截面与Wong对$^{12} $ C目标的类似弱结合的光核的计算非常吻合。
The elastic and inelastic scattering of $^7$Be from $^{12}$C have been measured at an incident energy of 35 MeV. The inelastic scattering leading to the 4.439 MeV excited state of $^{12}$C has been measured for the first time. The experimental data cover an angular range of $θ_{cm}$ = 15$^{\circ}$-120$^{\circ}$. Optical model analyses were carried out with Woods-Saxon and double-folding potential using the density dependent M3Y (DDM3Y) effective interaction. The microscopic analysis of the elastic data indicates breakup channel coupling effect. A coupled-channel analysis of the inelastic scattering, based on collective form factors, show that mutual excitation of both $^7$Be and $^{12}$C is significantly smaller than the single excitation of $^{12}$C. The larger deformation length obtained from the DWBA analysis could be explained by including the excitation of $^7$Be in a coupled-channel analysis. The breakup cross section of $^7$Be is estimated to be less than 10$\%$ of the reaction cross section. The intrinsic deformation length obtained for the $^{12}$C$^*$ (4.439 MeV) state is $δ_2$ = 1.37 fm. The total reaction cross section deduced from the analysis agrees very well with Wong's calculations for similar weakly bound light nuclei on $^{12}$C target.
