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Physical Review Letters 51 (1983) 1235-1238
Nuclei: a superfluid condensate of $\alpha$-particles ? A study with the interacting-boson model
Y.K. Gambhir, P. Ring, P. Schuck1

The authors have studied the question of whether pairs of neutrons and pairs of protons of the usual superfluid phases form a bound state to give rise to a superfluid condensate of "α particles." They indeed find indications for this to be the case from a BCS-like study for bosons using the proton-neutron interacting-boson model as well as from an even-odd effect in the number of pairs using experimental binding energies.
1 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Physique/Physique Nucléaire Théorique