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This paper presents recent experimental results on the yield of promptfission $\gamma$ rays from the spontaneous fission of $^{252}$Cf. We use anionization chamber to tag fission events and measure the masses and kineticenergies of the fission fragments and trans-stilbene organic scintillators tomeasure the neutrons and $\gamma$ rays emitted by the fission fragments. Thecombination of the ionization chamber and trans-stilbene scintillators allowsus to determine the properties of neutrons and $\gamma$ rays in coincidencewith the fragments. The yield of $\gamma$ rays is known to be influenced by theangular momenta (AM) of the fission fragments. We present new experimentalevidence that indicates that the total $\gamma$-ray multiplicity, i.e., the sumof both fragments' emission, saturates at sufficiently high internal fragmentexcitation energies. We also observe distinct behaviors for the yield of$\gamma$ rays from the light and heavy fragment, which for certain mass andtotal kinetic energy (TKE) regions are weakly or anti-correlated, indicatingthe presence of complex AM generation modes. We also observed a mass- andTKE-dependent anisotropy of the $\gamma$ rays, which challenges and expands onthe conventional notion that the fragments' AM are always alignedperpendicularly to the fission axis. Moreover, the dependence of the anisotropyon mass and TKE indicates a dependence of these properties on the specificfission channels, thus providing an insight into the deformations and dynamicsin fission and their connection with experimentally observable quantities.

Measurement of fragment-correlated $\gamma$-ray emission from $^{252}$Cf(sf)