High-resolution (p,t) reaction measurements as spectroscopic tests of {\it ab-initio} theory in the mid $pf$-shell

Abstract

Detailed spectroscopic measurements of excited states in ${}^{50}$Cr and ${}^{62}$Zn were performed using 24~MeV (p,t) transfer reactions on ${}^{52}$Cr and ${}^{64}$Zn, respectively. In total, forty-five states in ${}^{50}$Cr and sixty-seven states in ${}^{62}$Zn were observed up to excitation energies of 5.5~MeV, including several previously unobserved states. These experimental results are compared to {\it ab-initio} shell-model calculations using chiral effective field theory ($\chi$-EFT) with the valence-space in-medium similarity renormalization group (VS-IMSRG) method. This comparison demonstrates good agreement in the level orderings with these new theoretical methods, albeit with a slight over binding in the calculations. This work is part of a continued push to benchmark {\it ab-initio} theoretical techniques to nuclear structure data in $0^{+}\to 0^{+}$ superallowed Fermi $\beta$ decay systems.

Comments: Submitted to Physical Review C as a Regular Article. 10 pages, 9 figures, 2 tables