滴注线上的双中子转移几率和空间局域效应
Two-neutron transfer probabilities and spatial-localization effects at the drip line
摘要：
我们检查Cr同位素在滴水线，其中表面效应相关的存在下，一个弱结合的$s1/2$状态被认为是重要的，紧密相连的配对现象（反晕效应）。对于这些弱束缚的同位素，我们评估的基态的基态内的平均场为基础的方法的两个中子转移的概率。讨论的一个重要部分是专门分析的几个程序，可以用来约束的参数的现象学配对相互作用。首先调整参数以再现用五点公式评估的实验间隙。然而，这种选择有一些后果的配对相关性的演变沿同位素链，特别是在壳封闭。其他程序，然后（调整理论配对间隙在中间壳层和两个中子分离能量）。对于转移概率，我们讨论了与配对相互作用的空间定位的不同选择相关的影响。我们指出，对这种情况下（最后的绑定状态是一个低的$l$状态的弱绑定核）的转移反应的分析，可以提高我们的理解两个方面：在核中的配对相关的空间分布和在滴线的配对的持久性的一般问题。
英文摘要：
We examine Cr isotopes at the drip line, where surface effects related to the existence of a weakly bound $s1/2$ state are known to be important and tightly connected with the pairing phenomenon (anti-halo effect). For these weakly-bound isotopes, we evaluate the ground state to ground state two-neutron transfer probabilities within a mean-field-based approach. An important part of the discussion is devoted to the analysis of several procedures that can be employed to constrain the parameters of a phenomenological pairing interaction. The parameters are first adjusted to reproduce the experimental gaps evaluated with the five-point formula. This choice has however some consequences on the evolution of the pairing correlations along the isotopic chains and, in particular, at shell closures. Other procedures are then followed (adjustment on a theoretical pairing gap at mid-shell and on the two-neutron separation energies). For the transfer probabilities, we discuss the effects associated to different choices of the spatial localization of the pairing interaction. We indicate that the analysis of pair-transfer reactions for such cases (where the last bound state is a low-$l$ state in a weakly bound nucleus) may improve our understanding of two aspects: the spatial distribution of pairing correlations in nuclei and the general problem of the persistence of pairing at the drip lines.
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