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 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 $^{130}$Sn, extracted for the fissoning system $^{238}$U(n,f) at two different energies, as well as the 511ns isomer in $^{135}$Te extracted for the fissoning systems $^{232}$Th(n,f) and $^{238}$U(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 et al., Phys. Rev C, 108 (2023) 064602.
[2] Wilson, J. N. et al., Nature (London) 590 (2021) 566-570.