Photon strength distributions in stable even-even molybdenum isotopes

TL;DR

This study measures electromagnetic dipole-strength distributions in stable molybdenum isotopes using photon scattering, providing refined data that enhances understanding of nuclear responses below particle separation energies.

Contribution

It offers new, precise measurements of dipole strength distributions in molybdenum isotopes, correcting for inelastic transitions and improving the parametrization of the giant-dipole resonance.

Findings

Photon-scattering cross-sections connect smoothly to $( ext{γ,n})$ data.

Enhanced precision in the isovector giant-dipole resonance parametrization.

Corrected for inelastic transitions using gamma cascade simulations.

Abstract

Electromagnetic dipole-strength distributions up to the particle separation energies are studied for the stable even-even nuclides $^{92,94,96,98,100}$Mo in photon scattering experiments at the superconducting electron accelerator ELBE of the Forschungszentrum Dresden-Rossendorf. The influence of inelastic transitions to low-lying excited states has been corrected by a simulation of $\gamma$ cascades using a statistical model. After corrections for branching ratios of ground-state transitions, the photon-scattering cross-sections smoothly connect to data obtained from $(\gamma,n)$-reactions. With the newly determined electromagnetic dipole response of nuclei well below the particle separation energies the parametrisation of the isovector giant-dipole resonance is done with improved precision.