Girsanov density for a stopped Bessel process ($(R_T/x{)}^{(\delta -1)/2}\exp \{-\frac{1}{8}(\delta -1)(\delta -3){\int }_0^T{R}_s^{-2}ds\}$)

For reference Brownian motion $R=x+W$, stopped at $T=t\wedge {\tau }_{(a,b)}$ with $0<a<x<b$, this expression is the Radon-Nikodym derivative of the stopped Bessel process law of dimension $\delta$. The bounded stopped drift verifies the Novikov condition. The comparison laws must have the same initial value and the same stopping rule.