Ponente
Descripción
The intense flux of high energy neutrons, that will be generated at the upcoming DONES facility offers a unique possibility for material production, cross section measurements and investigation of exotic nuclear properties.
Radioactive material for samples that are interesting for nuclear astrophysics, but difficult to produce in the right amount and purity, could be made here. This enables measurements of never before measured cross sections.
For example the $^{85}$Kr(n,$\gamma$) reaction is a branching point for the s-process and has never been directly experimentally determined in the astrophysical important keV-regime. The isotopically pure production could be done at DONES via $^{85}$Rb(n,p) or $^{88}$Sr(n, $\alpha$). Another interesting reaction would be $^{185}$W(n,$\gamma$). One possible way of production could be $^{185}$Re(p,n).
In addition to the sample production via (n,p) and (n,$\alpha$) also the production via (n,2n) is interesting. DONES is almost uniquely suited for measurement of (n,2n) cross sections via the activation method. Furthermore (n,2n) cross sections allow the production of rare proton-rich isotopes, important for the p-process. Experimental data for this process is especially rare.
If the neutron spectrum can be successfully shaped, astrophysical relevant cross sections could be measured directly on site. The high neutron flux allows the observation of double neutron captures on isotopes like $^{30}$Si and $^{58}$Fe, enabling the determination of the capture cross sections of $^{31}$Si(2.5$~$h) or $^{59}$Fe(44$~$d).
