Isomeric ratios in photonuclear reactions of molybdenum isotopes induced by bremsstrahlung in the giant dipole resonance region

New measurements of 92Mo(γ, n) and (γ, 3n) reactions using laser-driven bremsstrahlung γ-ray

“…The present FACSs and IRs are listed in Table 2 and shown in Figures 3, 4, 5 with comparisons of the previous works [31][32][33][34][35][36][37][38][39]. The statistical errors in this experiment range from 4.4% to 11.3% for different decay γ-ray, and the systematic errors include the instabilities of each electron pulse, the γ-ray spectrum calculation, the calibration of detection efficiency, and the correction of the activation target.…”

“…For 92 Mo(γ, n) 91 Mo reaction, 91 Mo can be formed with the isomeric state with a spin of 1/2 − or the ground state with a spin of 9/2 + . A lot of works had reported the cross sections [31][32][33] and IRs [31,[34][35][36][37][38][39] of 92 Mo(γ, n) 91m,g Mo reaction, but the experimental IRs did not match each other very well, especially at high energy region. In the giant dipole resonance (GDR) region, Thiep et al [39] and Davidov et al [37] had a maximum difference of 26%.…”

“…A lot of works had reported the cross sections [31][32][33] and IRs [31,[34][35][36][37][38][39] of 92 Mo(γ, n) 91m,g Mo reaction, but the experimental IRs did not match each other very well, especially at high energy region. In the giant dipole resonance (GDR) region, Thiep et al [39] and Davidov et al [37] had a maximum difference of 26%. In high energy region, Bartsch et al [38] reported an IR of 0.97 at end-point energy of 55 MeV while Haustein et al [35] measured an IR of 0.52 at endpoint energy of 70 MeV, the huge difference is quite doubtful for high-energy IRs.…”

Expanding Nuclear Physics Horizons with the Gamma Factory

“…The isomer ratio, i.e., ratio of produced nuclei in the isomeric state to those in the ground state, has been studied with many nuclear reactions including (γ, n) via GDR (see, for example, Ref. [389]) using bremsstrahlung photons. The knowledge of isomer ratios of different isotopes and their energy dependences could help to reveal the nuclear structure and mechanism of nuclear reactions.…”

“…The knowledge of isomer ratios of different isotopes and their energy dependences could help to reveal the nuclear structure and mechanism of nuclear reactions. But currently available data are scarce and have significant discrepancies [389]. Secondary photons at the GF would offer significant improvement in measuring such data compared with bremsstrahlung photons, as a result of better energy resolution and higher photon fluxes.…”