Distribution of Spin Fragments of the Binary Fission of Atomic Nuclei Taking into Account Wriggling and Bending Oscillations

Abstract

A mechanism is proposed in quantum fission theory that describes the appearance of large values of the spins of light (\({{\vec {J}}_{1}}\)) and heavy (\({{\vec {J}}_{2}}\)) fission fragments (FFs) and large relative orbital momentum \(\vec {L}\). An important difference between the approach proposed in this study and the widely used statistical model, which assumes heating of the FFs to temperatures of the order of 1 MeV, is the “coldness” of the fissile nucleus at all stages of its evolution, starting from the descent of the nucleus from the outer saddle point and ending with the moment of its fission into the indicated fragments. The approach proposed, which makes it possible to describe the spin distributions (SD) of binary fission fragments, both in the case of induced fission of the \({}^{{232}}{\text{Th}}\left( {n,f} \right)\) and \({}^{{238}}{\text{U}}\left( {n,f} \right)\) nuclei and spontaneous fission of the \({}^{{252}}{\text{Cf}}\left( {s,f} \right)\) nucleus is based on the joint consideration of zero-point wriggling and bending oscillations.