The 141 Pr (γ, , n) cross-section is critical to the nucleosynthesis of p-nuclides ¹36, 138Ce in thermonuclear supernovae and in massive stars. The photonuclear reaction of ¹41Pr (γ, , n) s a new method for producing ^ 140 Pr radioisotopes for positron emission tomography tracing in nuclear medicine. We aim to perform an accurate measurement of the 141 Pr (γ, , n) ¹40Pr cross-section over a sufficiently wide range of gamma energies of the p-process and deduce the ¹40Pr (n, , γ) ¹41Pr cross-section with γSF and TALYS-SMLO models. We determined the astrophysical reaction rate of ¹41Pr (γ, , n) ¹40Pr at the temperature range of 0. 2-10, GK based on the new measurement cross-section of the 140 Pr reaction. We performed a new measurement of the 141 Pr photoneutron cross-section at the Shanghai Laser Electron Gamma Source of the Shanghai Synchrotron Radiation Facility using quasi-monoenergetic laser Compton scattered γ-ray beam s. The neutrons emitted by the ¹41Pr target were detected by the flat-efficiency detector array, while the γ beam transmitted by the ¹41Pr target were attenuated by a copper absorber and then measured by a bismuth germanate detector in order to reconstruct the γ spectrum incident on the target. The cross-section data of 141 Pr (γ, , n) were acquired using an unfolding iteration method with an uncertainty of less than 4%, and the inconsistencies between the available experimental data and evaluation libraries were discussed. The inverse reaction cross-section of ¹40Pr (n, , γ) and the reaction rates for the ¹41Pr (γ, , n) reaction were derived over the astrophysically relevant temperature range of the p-process nucleosynthesis model. The photodisintegration decay constants of the ¹41Pr (γ, , n) reaction for stellar temperatures between 0. 2, GK and 10, GK are provided in a tabular form and by an analytical fitting expression. The λ_ γ n (^ 141 Pr) = 0. 013 ± 0. 001, s ^ -1 at a typical p-process temperature of T=2. 5, GK was also computed. The photodisintegration decay constants of the 141 Pr (γ, , n) reaction deviate significantly from previous theoretical predictions, and the uncertainties are significantly reduced in the direct measurement.
Hu et al. (Fri,) studied this question.