Determination of photo-nuclear cross section of ${}^{61}$Ni($\gamma$,xp) reaction via surrogate ratio technique

The photo nuclear reaction cross section of ${}^{61}$Ni($\gamma$,xp) reaction have been measured by employing surrogate reaction technique. This indirect method is used for the first time to obtain the cross section of photo nuclear reaction. The compound nucleus ${}^{61}$Ni${}^{\ast }$ was populated using the transfer reaction ${}^{59}$Co(${}^6$Li,$\alpha$) at E${}_{lab}=$ 40.5 MeV. To calculate the surrogate ratio, ${}^{60}$Ni($\gamma$,xp) was selected as reference reaction and the corresponding compound nucleus ${}^{60}$Ni${}^{\ast }$ was populated using the transfer reaction ${}^{56}$Fe(${}^6$Li,d) at E${}_{lab}=$ 35.9 MeV. The experimental cross section data of the reference reaction has been taken from EXFOR data libraries. Compound nuclear cross section calculations have been done using EMPIRE 3.2.3 code.