Probable observation of the nuclear Cooper pair mean square radius in superfluid nuclei

BCS condensation of nuclear Cooper pairs leading to superfluid nuclei violates pair of particles conservation, thus defining a privileged direction in gauge space. The nuclear tweezer specific to tether the associated gauge angle cannot be but another system which also violates pairs of particles conservation. That is, another nuclear condensate in weak contact with the first one through the Josephson-like junction transiently established in a heavy-ion collision. The associated single Cooper pair "current" being the specific probe of the intrinsic structure of the transferred quasi-boson. The corresponding absolute cross section normalized with respect to the single-quasiparticle transfer one, constitutes the connection to the experimental results where from one can read the value of the Cooper pair correlation length. One can then conclude that the mean square radius of nuclear Cooper pairs joins the ranks of those quantities characterizing the atomic nucleus which, in principle, are measurable.