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The photodisintegration reaction cross-sections for  94 Mo( γ ,n) and  90 Zr( γ ,n) have been experimentally investigated with quasi-monochromatic photon beams at the High Intensity  γ -Ray Source (HI γ S) facility, Triangle University Nuclear Laboratory (TUNL). The measurements were focused primarily on studying the energy dependence of the photoneutron cross sections, which is the most direct way of testing statistical models, and were performed close to the respective neutron thresholds and above up to ~ 20 MeV. Neutrons from the ( γ ,n) reactions were detected using a 4 π  assembly of  3 He proportional counters developed at Los Alamos National Laboratory and presently available at TUNL. While the  94 Mo( γ ,n) cross section measurement aims to contribute to a broader investigation for understanding the  γ -process (the mechanism responsible for the nucleosynthesis of the so-called  p -nuclei), the information from the  90 Zr( γ ,n) data is relevant to constrain QRPA calculations of  γ -ray strength functions in this mass region. In this contribution, we will present our preliminary results of the total ( γ ,n) excitation functions for the two photoneutron reactions on  94 Mo and  90 Zr.

Cross-section measurements of the 94Mo(γ,n) and 90Zr(γ,n) reactions using real photons at the HIγS facility

Cross-section measurements of the ⁹⁴Mo(γ,n) and ⁹⁰Zr(γ,n) reactions using real photons at the HIγS facility