γγ-Tripelkorrelationsmessungen am Fe56 bei (pp′ γγ)-Reaktionen

The investigations ofγγ-triple correlations following (pp′)-reactions are used to determine the spins of the second and third excited level in Fe⁵⁶ and theE2/M1 mixing ratio of the transition from the third to the first excited level. The population numbers of the substates are also determined. AtE _p =4.9 MeV the correlation associated with the second level was measured. AtE _p =5.5 MeV the correlations associated with the second and third level and the angular distributions of the photons were investigated. The spin series of 0^ü, 2^ü, 4^ü, 2^ü and a mixing ratio ofδ=0.20 was obtained. The results of the angular distributions and the correlations are compared. They agree well with experimental results of other authors, obtained by various methods of measurement, and with theoretical predictions.