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We study the role of configuration mixing in the heavier even-even isotopesof Argon. We begin by limiting the configurations of the even-even Ar isotopesto $(d_{3/2}^2)_{\pi}$ $(f_{7/2}^n)_{\nu}$. There, due to the particularlocation in this shell model space of $^{40}$Ar and $^{44}$Ar, we find that thespectra, B(E2)'s and magnetic moments of these two nuclei are identical. Anydeviation from this equality is direct evidence of configuration mixing. In alarger shell model space there are significant differences between these twonuclei, with $^{44}$Ar being more collective. We also consider other even-evenisotopes of Argon and study how their nuclear structure effects evolve with N.We compare in the full 0$\hbar \omega$ space $(sd)_{\pi}$ $(fp)_{\nu}$ theresults of calculations with the WBT interaction and with the newer SDPF,denoted SDPF-U, interaction.

Nuclear Structure of the even-even Argon isotopes with a focus on magnetic moments