Spin distribution of fission fragments involving bending and wriggling modes
This paper presents a theoretical description of the spin distributions of fragments from low-energy induced and spontaneous nuclear fission, expressed in an analytical form. The mechanism of pumping high spin values for deformed fission fragments is explained. The idea is that the source of the gen...
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Zusammenfassung: | This paper presents a theoretical description of the spin distributions of
fragments from low-energy induced and spontaneous nuclear fission, expressed in
an analytical form. The mechanism of pumping high spin values for deformed
fission fragments is explained. The idea is that the source of the generation
of high relative orbital moments and spins of the fragments are the transverse
wriggling and bending vibrations of the pre-fragments, while the nucleus
remains "cold" until the moment of fission. To verify this hypothesis,
experimental distributions for the induced fission of $\rm ^{232}Th$ and $\rm
^{238}U$ nuclei, as well as the spontaneous fission of $\rm ^{252}Cf$, were
compared. The results show reasonable agreement both in the magnitude of the
mean spin values and in the sawtooth shape of the sip distribution with respect
to the fragment mass number. The results are also compared with other
approaches to the description of these quantities, and possible reasons for
their discrepancies are discussed. |
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DOI: | 10.48550/arxiv.2412.04410 |