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Proton-neutron pairing and alpha-type quartet condensation in nuclei

机译:质子中子配对和核中的α型四重奏凝聚

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Proton-neutron pairing in nuclei is commonly described by generalized BCS/HFB models. By construction, these models do not conserve the particle number and the isospin. Here we shall review an alternative approach, based on quartets instead of Cooper pairs, in which both the particle number and the isospin are exactly conserved. In this approach the ground state of N=Z nuclei is approximated by a condensate of alpha-like quartets built by two neutrons and two protons coupled to the isospin T=0. For nuclei with N > Z the ground state is taken as a superposition of a quartet condensate and a pair condensate formed by the neutrons in excess relative to the isotope with N=Z.
机译:核中的质子中子配对通常由广义的BCS / HFB模型描述。通过施工,这些模型不保存粒子数和丝孔。在这里,我们将基于四重奏而不是Cooper对的替代方法来审查替代方法,其中粒子数和索泊宾宾杉共实保守。在这种方法中,n = z核的地位近似于由两个中子构建的α样四重奏的冷凝物近似,两种质子耦合到isospin t = 0。对于N> Z的核,将接地状态作为四重子缩合物的叠加,并且由中央形成的一对缩合物相对于具有n = Z的同位素形成。

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