The work addresses the isotopic shift of nuclear radii for the even-even $^{ 36-52}$Ca isotopes using the interacting boson model (IBM) that includes the mixing from normal and intruder configurations. We obtain a good agreement between the calculated and experimental data, particularly for the dip at $^{ 48}$Ca. A direct correlation between nuclear size and electric monopole transitions is established to compute the electric monopole transition strengths, $\rho^2(E0)$. We further study the isotopic shift for the even-even $^{ 32-46}$Ar and $^{ 44-50}$Ti isotopes.
Categories: nucl-th