Goodness of Isospin in Neutron Rich Systems from the Fission Fragment Distribution

TL;DR

This paper demonstrates that isospin conservation can effectively predict the distribution of neutron-rich fission fragments in heavy nuclei, providing new insights into nuclear structure and reactions.

Contribution

It introduces a novel application of isospin conservation to calculate fission fragment yields in neutron-rich systems, aligning well with experimental data.

Findings

Isospin conservation explains fragment yield distributions.

Calculated yields match experimental trends.

First direct evidence of isospin conservation in neutron-rich fission.

Abstract

We present the results of our calculations for the relative yields of neutron-rich fission fragments emitted in $^{208}$Pb ($^{18}$O, fission) reaction by using the concept of the conservation of isospin and compare with the experimental data. We take into account a range of isospin values allowed by the isospin algebra and assume that the fission fragments are formed in Isobaric Analog States. We also take into account the neutron multiplicity data for various neutron-emission channels in each partition, and use them to obtain the weight factors in calculating the yields. We then calculate the relative yields of the fission fragments. Our calculated results are able to reproduce the experimental trends reasonably well. This is the first direct evidence of the isospin conservation in neutron-rich systems and may prove a very useful tool in their studies.