Speaker
Description
In nuclear fission, a heavy nucleus splits and the fission fragments emerge
spinning [2]. The isomeric yield ratio (IYR) i.e. the population frequency of
an isomer, is know to be sensitive to the angular momentum of the fragment.
Measuring the IYR can therefore give information about about the initial
sate of the fission fragments.
This work uses a technique to reach short lived isomeric states where
the IYR has not been measured before [1]. We study the IYR of the 52ns
isomer in 130Sn, extracted for the fissoning system 238U(n,f) at two different
energies, as well as the 511ns isomer in 135Te extracted for the fissoning
systems 232Th(n,f) and 238U(n,f) at two different energies. From looking at
how the different fissoning systems affect the IYR, we get more knowledge
about what impact the angular momentum generation. The fission code
GEF is used in combination with the nuclear decay code TALYS to find the
fragment angular momentum from the IYR.
References
[1] D. Gjestvang, J. N. Wilson, A. Al-Adili, S. Siem, Z. Gao, and J. Randrup.
Examination of how properties of a fissioning system impact isomeric
yield ratios of the fragments. Phys. Rev. C, 108:064602, Dec 2023.
[2] J. N. Wilson, D. Thisse, M. Lebois, N. Jovancevic, and D. Gjestvang.
Angular momentum generation in nuclear fission. Nature (London),
590(7847):566–570, 2021.
