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

K. G. Leach, J. D. Holt, P. E. Garrett, S. R. Stroberg, G. C. Ball, P. C. Bender, V. Bildstein, A. Diaz Varela, R. Dunlop, T. Faestermann

Abstract

Detailed spectroscopic measurements of excited states in $^{50}\mathrm{Cr}$ and $^{62}\mathrm{Zn}$ were performed using 24-MeV $(p,t)$ transfer reactions on $^{52}\mathrm{Cr}$ and $^{64}\mathrm{Zn}$, respectively. In total, 45 states in $^{50}\mathrm{Cr}$ and 67 states in $^{62}\mathrm{Zn}$ were observed up to excitation energies of 5.5 MeV, including several previously unobserved states. These experimental results are compared to ab-initio shell-model calculations using chiral effective field theory with the valence-space in-medium similarity renormalization group method. This comparison demonstrates good agreement in the level orderings with these new theoretical methods, albeit with a slight overbinding in the calculations. This work is part of a continued push to benchmark ab-initio theoretical techniques to nuclear-structure data in ${0}^{+}\ensuremath{\rightarrow}{0}^{+}$ superallowed Fermi $\ensuremath{\beta}$-decay systems.

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