Determination of the ${}^{209}$Bi(n,${\hat{I}}^3$)${}^{210g}$Bi cross section using the NICE-Detector

Abstract

The capture cross section of ${}^{209}$Bi(n,${\hat{I}}^3$)${}^{210g}$Bi was measured at different astrophysically energies including thermal capture cross section (25 meV), resonance integral, and the Maxwellian averaged cross section at a thermal energy of $kT$ = 30 keV. The partial capture cross section ($\ddot{I}{ƒ}_g$) was determined using the activation technique and by measuring the ${}^{210}$Po activity. The newly developed and tested NICE detector setup was used to measure the $\hat{I}\pm$-activity of the ${}^{210}$Po. Using this setup the thermal and resonance integral cross sections were determined to be $16.2\pm 0.97$~mb and $89.81\pm 8.0$~mb, respectively. And the Maxwellian average cross section was measured to be $2.01\pm 0.38$~mb.

26 pages, 8 figures