$\gamma$-ray Strength Function for Barium Isotopes

Abstract

Photoneutron cross sections were measured for ${}^{137}$Ba and ${}^{138}$Ba at energies below two-neutron threshold using quasi-monochromatic $\gamma$-ray beams produced in laser Compton-scattering at the NewSUBARU synchrotron radiation facility. The photoneutron data are used to constrain the $\gamma$-ray strength function on the basis of the Hartree-Fock-Bogolyubov plus quasi-particle random phase approximation using the Gogny D1M interaction. Supplementing the experimentally constrained $\gamma$-ray strength function with the zero-limit E1 and M1 contributions which are unique to the deexcitation mode, we discuss radiative neutron capture cross sections relevant to the s-process nucleosynthesis of barium isotopes in the vicinity of the neutron magic number 82.

arXiv commentarXiv admin note: substantial text overlap with arXiv:1811.00291, arXiv:1804.07654

References in corpus (11)

• Astrophysical Reaction Rates From Statistical Model Calculations
• Radiative strength functions in 93-98Mo
• Large enhancement of radiative strength for soft transisitons in the quasicontinuum
• Low-energy enhancement of magnetic dipole radiation
• Large-scale deformed quasiparticle random-phase approximation calculations of the $\gamma$-ray strength function using the Gogny force
• Large low-energy $M1$ strength for ${}^{56,57}$Fe within the nuclear shell model
• Verification of detailed balance for $\gamma$ absorption and emission in Dy isotopes
• Thermodynamic Properties of ${}^{56,57}$Fe
• Photoneutron cross sections for Ni isotopes: Toward understanding $(n,\gamma )$ cross sections relevant to the weak s-process nucleosynthesis
• Low energy magnetic radiation enhancement in the f${}_{7/2}$ shell
• The $\gamma$-ray strength function for Thallium isotopes relevant to the ${}^{205}$Pb - ${}^{205}$Tl chronometry