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We study a mixture of s-bosons and like-nucleon pairs with the standardpairing interaction outside a inert core. Competition between the nucleon-pairsand s-bosons is investigated in this scenario. The robustness of the BCS-BECcoexistence and crossover phenomena is examined through an analysis of pf-shellnuclei with realistic single-particle energies in which two configurations withPauli blocking of nucleon-pair orbits due to the formation of the s-bosons istaken into account. When the nucleon-pair orbits are considered to beindependent of the s-bosons, the BCS-BEC crossover becomes smooth with thenumber of the s-bosons noticeably more than that of the nucleonpairs near thehalf-shell point, a feature that is demonstrated in the pf-shell for severalvalues of the standard pairing interaction strength. As a further test of therobustness of the BCS-BEC coexistence and crossover phenomena in nuclei,results are given for B(E2; 0^{+}_{g}->2^{+}_1) values of even-even 102-130Snwith 100Sn taken as a core and valence neutron pairs confined within the 1d5/2,0g7/2, 1d3/2, 2s1/2, 1h11/2 orbits in the nucleon-pair orbit and the s-bosonindependent approximation. The results indicate that the B(E2) values are wellreproduced.

A nucleon-pair and boson coexistent description of nuclei