Role of isospin and its conservation in neutron-rich fission fragments

Abstract

Following upon our earlier paper [1] containing some initial results, we present detailed discussion and complete results in this paper, which provide the first direct evidence for the validity of isospin as a nearly good quantum number in neutron-rich systems. The evidence comes from the reproduction of the general features of the partition-wise relative yields of neutron-rich fission fragments produced in two heavy-ion induced fusion fission reactions, namely ${}^{208}$Pb (${}^{18}$O, f) and ${}^{238}$U (${}^{18}$O, f), by using the concept of isospin conservation. To fix the isospin values and use the isospin algebra, we invoke what we term as Kelson's conjectures. We present a consistent scheme for isospin assignments based on these considerations. Our calculated results confirm that isospin behaves as an approximately good quantum number in neutron-rich systems, in this case, the fission fragments.

arXiv comment25 pages, 6 figures

References in corpus (3)

• Conservation of Isospin in Neutron-Rich Fission Fragments
• Goodness of Isospin in Neutron Rich Systems from the Fission Fragment Distribution
• Isospin Conservation in Neutron Rich Systems of Heavy Nuclei

Cited by in corpus (1)

• Measurement of relative isotopic yield distribution of even-even fission fragments from ${}^{235}$U($n_{th}$,$f$) following $\gamma$ ray spectroscopy