Nuclear structure of the even-even argon isotopes with a focus on magnetic moments
S.J.Q. Robinson et al.
We study the role of configuration mixing in the heavier even-even isotopes of argon. We begin by limiting the configurations of the even-even Ar isotopes to (d3/22)&pi (f7/2n)ν. There, due to the particular location in this shell-model space of 40Ar and 44Ar, we find that the spectra, B(E2)’s, and magnetic moments of these two nuclei are identical. Any deviation from this equality is direct evidence of configuration mixing. In a larger shell-model space there are significant differences between these two nuclei, with 44Ar being more collective. We also consider other even-even isotopes of argon and study how their nuclear structure effects evolve with N. We compare in the full 0ℏ ω space (sd)π (fp)ν the results of calculations with the WBT interaction and with the newer SDPF, denoted SDPF-U, interaction.