arXiv 1212.24372012-12-11nucl-thnucl-ex

11 Li和12 Be的核场论预言：阐明核中配对的起源

Nuclear Field Theory predictions for 11Li and 12Be: shedding light on the origin of pairing in nuclei

Gregory Potel, Andrea Idini, Francisco Barranco, Enrico Vigezzi, Ricardo A. Broglia

备注：: 61 pages, 27 figures, submitted to PRC

摘要：

最近通过对~（11）Li的双核子转移反应的研究，用核结构直接反应统一理论进行了分析，通过~（91）Li的第一激发态布居和对强猝灭基态跃迁的观察，提供了强有力的直接和间接的证实。声子介导的对相互作用是8.5ms寿命的11 Li核中子晕的主要结合机制。换句话说，11 Li的基态可以被看作是束缚在9 Li核上的中子库珀对，主要通过核的集体振动和由中子晕来回晃动对核的质子所产生的pigmy共振的交换，平均场导致未束缚的两个粒子态，这种情况基本上不会被作用在晕中子之间的裸核子-核子相互作用所改变。两个中子拾取数据，连同（t，p）的数据7 Li，建议存在一个配对的振动带的基础上9 Li，其成员可以激发的逆运动学实验的帮助下，在11 Li（p，t）9 Li反应的情况下。偏离谐性可以提供洞察介质极化效应对库珀对核配对的作用，更不用说关于N=6壳层闭合的“刚性”的具体信息了。关于这些问题的进一步信息由与反应12 Be（p，t）10 Be（gs）和12 Be（p，t）10 Be（pv）（~ 10 Be（p，t）8 Be（gs））相关的预测绝对微分截面提供。特别地，对于最后一个反应，σ_{abs}的预测值可以改变一个数量级，这取决于在计算（对去除）模式的基态关联时是否自洽地处理与d_{5/2}轨道相关的晕性质。

英文摘要：

Recent data resulting from studies of two-nucleon transfer reaction on 11Li, analyzed through a unified nuclear-structure-direct-reaction theory have provided strong direct as well as indirect confirmation, through the population of the first excited state of 9Li and of the observation of a strongly quenched ground state transition, of the prediction that phonon mediated pairing interaction is the main mechanism binding the neutron halo of the 8.5 ms-lived 11Li nucleus. In other words, the ground state of 11Li can be viewed as a neutron Cooper pair bound to the 9Li core, mainly through the exchange of collective vibration of the core and of the pigmy resonance arizing from the sloshing back and forth of the neutron halo against the protons of the core, the mean field leading to unbound two particle states, a situation essentially not altered by the bare nucleon-nucleon interaction acting between the halo neutrons. Two-neutron pick-up data, together with (t,p) data on 7Li, suggest the existence of a pairing vibrational band based on 9Li, whose members can be excited with the help of inverse kinematic experiments as was done in the case of 11Li(p,t)9Li reaction. The deviation from harmonicity can provide insight into the workings of medium polarization effects on Cooper pair nuclear pairing, let alone specific information concering the "rigidity" of the N=6 shell closure. Further information concerning these questions is provided by the predicted absolute differential cross sections associated with the reactions 12Be(p,t)10Be(gs) and 12Be(p,t)10Be(pv)(~10Be(p,t)8Be(gs)). In particular, concerning this last reaction, predictions of σ_{abs} can change by an order of magnitude depending on whether the halo properties associated with the d_{5/2} orbital are treated selfconsistently in calculating the ground state correlations of the (pair removal) mode, or not.

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英文摘要：

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