The dependence of correlations of neutron multiplicity ν and gamma-ray multiplicity Mγ in spontaneous fission of 252 Cf on fragment mass A* and total kinetic energy TKE has been investigated employing the ratio of M γ /ν and the form of Mγ(ν). We show for the first time that Mγ and ν have a complex correlation for heavy fragment masses, while there is a positive dependence of Mγ(ν) for light fragment masses and for near-symmetric mass splits. The ratio Mγ/ν exhibits strong shell effects for the neutron magic number N = 50 and near the doubly magic number shell closure at Z = 50 and N = 82. The gamma-ray multiplicity Mγ has a maximum for TKE = 165-170 MeV. Above 170 MeV Mγ(TKE) is approximately linear, while it deviates significantly from a linear dependence at lower TKE. The correlation between the average neutron and gamma-ray multiplicities can be partly reproduced by model calculations.
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