Configuration interaction calculations for the region of $^{76}$Ge

I will present a short history of the configuration interaction Hamiltonians that have been developed for the $ (0f_{5/2},1p_{3/2},1p_{1/2},0g_{9/2}) $ ($ jj44 $) model space. This model space is appropriate for the region of nuclei bounded by the nickel isotopes for $ Z=28 $ and the isotones with $ N=50 $. I will discuss results for the double-beta decay of $^{76}$Ge that lies in the $ jj44 $ region. I will show results for the structure of nuclei around $^{76}$Ge for some selected data from gamma decay, Gamow-Teller beta decay, charge-exchange reactions, one-nucleon transfer reactions, and two-nucleon transfer reactions.