Crespo Campo, LuciaGuttormsen, MBello Garrote, F.L.Eriksen, TomasGiacoppo, FGorgen, A.Hadynska-Klek, K.Klintefjord, M.Larsen, A CRenstrøm, TSahin, ESiem, SSpringer, A.Gabor Tornyi, TamasTveten, G M2020-03-102020-03-102469-9993http://hdl.handle.net/1885/202110Previously published particle-γ coincidence data on the 64Ni(p,p′γ) 64Ni and 64Ni(dpγ)65Ni reactions were further analyzed to study the statistical properties of γ decay in64, 65Ni. To do so, the γ-decay to the quasicontinuum region and discrete low-lying states was investigated at γ -ray energies of 2.0–9.6 and 1.6–6.1 MeV in 64 Ni and 65 Ni, respectively. In particular, the dependence of the γ-strength function with initial and final excitation energy was studied to test the validity of the generalized Brink-Axel hypothesis. Finally, the role of fluctuations in transition strengths was estimated as a function of γ-ray and excitation energy. The γ-strength function is consistent with the hypothesis of the independence of initial excitation energy, in accordance with the generalized Brink-Axel hypothesis. The results show that the γdecay to low-lying levels displays large fluctuations for low initial excitation energies.We are also grateful for the financial support received from the Research Council of Norway (NFR). S.S. and G.M.T. acknowledge funding under NFR project Grants No. 210007 and No. 262952/F20. A.C.L. acknowledges financial support from the ERC-STG2014 under Grant No. 637686.10 pagesapplication/pdfen-AU© 2018 American Physical Society. L. Crespo Campo, M. Guttormsen, F. L. Bello Garrote, T. K. Eriksen, F. Giacoppo, A. Görgen, K. Hadynska-Klek, M. Klintefjord, A. C. Larsen, T. Renstrøm, E. Sahin, S. Siem, A. Springer, T. G. Tornyi, and G. M. Tveten, Test of the generalized Brink-Axel hypothesis in ⁶⁴ ⁶⁵Ni , Physical Review C, 98(5) 2018, 054303, doi 10.1103/PhysRevC.98.054303Electromagnetic transitions, H & He induced nuclear reactions, Nuclear reactions, Nuclear structure & decays, Resonance reactions, Statistical phenomena & chaos,Transfer reactions2018-11-0610.1103/PhysRevC.98.0543032019-11-25