Investigation of gamma-ray transitions in56Ni

Angular correlation measurements for the⁵⁴Fe(³He,n γ)⁵⁶Ni reaction were performed at \(E_{3_{He} } = 12.5\) MeV. Method II of Litherland and Ferguson was used to determine the multipole mixing ratio of theγ-radiation and the spins of the excited levels at 3925 and 3956 keV. As the most probable spin assignments we deduced 4⁺ (3925 keV) and 0⁺ (1,2) (3956 keV). The mixing ratio found for the 1225 keV transition from 4⁺→2 ₁ ⁺ isδ(M3/E2)=+0.21 _?0.16 ^+0.23 This result is compared with a shell model calculation.