论文标题
较弱的8LI分手中的库仑 - 核动力学
Coulomb-nuclear dynamics in the weakly-bound 8Li breakup
论文作者
论文摘要
通过考虑$^8 $^8 $ li+$^{12} $^{12} $ c和$^8 $ li+$^{208} $ pb分解反应，对弹丸地面结合能$ \ VAREPSILON_B $的详细研究依赖于弹丸地面结合能$ \ VAREPSILON_B $。为此，还考虑了$^8 $ li nucleus（$ \ varepsilon_b = 2.03 $ 〜mev）的实验性单中子分离能量，也正在考虑$ \ varepsilon_b $降低到$ \ varepsilon_b = 0.01 $ 〜Mev的较低值。结果表明，所有分解过程都会成为外围，因为$ \ varepsilon_b \ to 0.01 $ meV，这被理解为据知名的与弱弹丸相关的地面波函数的众所周知的大空间扩展。发现库仑分手横截面更强地依赖于$ \ varepsilon_b $，而核破裂横截面比$ \ varepsilon_b $降低，即使在自然核定为主导的反应中，库仑破裂变得更加重要。这主要是由于库仑力的远程性质，导致库仑破裂直接依赖于电磁过渡矩阵。还强调了这样一个事实，即当分裂变得更加周围时，核吸收对小结合起较小的作用。
A detailed study of total, Coulomb and nuclear breakup cross sections dependence on the projectile ground-state binding energy $\varepsilon_b$ is presented, by considering the $^8$Li+$^{12}$C and $^8$Li+$^{208}$Pb breakup reactions. To this end, apart from the experimental one-neutron separation energy of $^8$Li nucleus ($\varepsilon_b=2.03$~MeV), lower values of $\varepsilon_b$ down to $\varepsilon_b=0.01$~MeV, are also being considered. It is shown that all breakup processes become peripheral as $\varepsilon_b\to 0.01$ MeV, which is understood as due to the well-known large spacial extension of ground-state wave functions associated to weakly-bound projectiles. The Coulomb breakup cross section is found to be more strongly dependent on $\varepsilon_b$ than the nuclear breakup cross section, such that the Coulomb breakup becomes more significant as $\varepsilon_b$ decreases, even in a naturally nuclear-dominated reaction. This is mainly due to the long-range nature of the Coulomb forces, leading to a direct dependence of the Coulomb breakup on the electromagnetic transition matrix. It is also highlighted the fact that the nuclear absorption plays a minor role for small binding when the breakup becomes more peripheral.
