According to the'Contributions of 20th Century Women to Physics'( CWP ) Project of the UCLA entry on Koller, Koller was a pioneer in several areas of nuclear and condensed matter physics, including the first identification of the double gamma decay of the observationally stable but theoretically unstable 40 Ca isotope to the ground state : a 0 + ?! 0 + transition; the observation of the interplay of single particle and collective motions in nuclei; and the description of a broad range of nuclear electromagnetic transitions in the rare earth region using a simple relation based on constant gyromagnetic ratios for nucleon pairs.
