Angular Momentum of Fission Fragments from Microscopic Theory

Marević, Petar; Schunck, Nicolas; Randrup, Jorgen; Vogt, Ramona

doi:10.48550/arxiv.2101.03406

Cited by 1 publication

(3 citation statements)

References 54 publications

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“…Finally it should be noted that the modified moments of inertia tend to favor the light fragments (because of their deformations), so these will now have larger spins than their heavy partners, as found experimentally [1] (This is also consistent with recent microscopic studies [18,19].) However, importantly, fragment spins remain approximately uncorrelated after the modification of the moments of inertia, as illustrated in Table I and Fig.…”

Section: Mass Dependencesupporting

confidence: 84%

“…(It should also be noted that S f (A f ) would still display a sawtooth form even in the extreme scenario where only the wriggling modes were populated, causing the two fragment spins to be perfectly parallel in each event.) The finding, based on the observed sawtooth behavior of S f (A f ), that the light fragment carries more angular momentum than its heavy partner, was anticipated recently on the basis of microscopic studies [18,19].…”

Section: Discussionmentioning

confidence: 75%

“…Thus they have considerably larger moments of inertia and can acquire correspondingly larger angular momenta. (These expectations were indeed borne out by recent microscopic studies of scission comnfigurations [17][18][19]. )…”

Section: Mass Dependencementioning

confidence: 84%

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Generation of fragment angular momentum in fission

Randrup,

Vogt

2021

Preprint

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A recent analysis of experimental data [1] found that the angular momenta of nuclear fission fragments are uncorrelated. Based on this finding, the authors concluded that the spins are therefore determined only after scission has occurred. We show here that the nucleon-exchange mechanism, as implemented in the well-established event-by-event fission model FREYA, while agitating collective rotational modes in which the two spins are highly correlated, nevertheless leads to fragment spins that are largely uncorrelated. This fact invalidates the reasoning of those authors. Furthermore, it was reported [1] that the mass dependence of the average fragment spin has a sawtooth structure. We demonstrate that such a behavior naturally emerges when shell and deformation effects are included in the moments of inertia of the fragments at scission.

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Section: Mass Dependencesupporting

confidence: 84%

Section: Discussionmentioning

confidence: 75%