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γ -ray strength function for thallium isotopes relevant to the Pb 205 - Tl 205 chronometry

par Utsunomiya, Hiroaki;Renstrøm, Therese;Tveten, G.M.;Goriely, Stéphane ;Ari-Izumi, T.;Filipescu, Dan Mihai;Kaur, J.;Lui, Yiu-Wing;Luo, Wen;Miyamoto, Shyuji;Larsen, Ann-Cecilie;Hilaire, Stéphane;Péru, S.;Koning, Arjan J.
Référence Physical Review C, 99, 2, 024609
Publication Publié, 2019-02-01

Article révisé par les pairs

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Résumé :

Photoneutron cross sections were measured for Tl203 and Tl205 at energies between the one- and two-neutron thresholds using quasimonochromatic γ-ray beams produced in laser Compton scattering at the NewSUBARU synchrotron radiation facility. Our measurement results in cross sections significantly different from the previously reported bremsstrahlung experiment, leading to rather different giant dipole resonance (GDR) parameters, in particular to lower GDR peak energies and higher peak cross sections. The photoneutron data are used to constrain the γ-ray strength function on the basis of the Hartree-Fock-Bogolyubov plus quasiparticle random-phase approximation using the Gogny D1M interaction. Supplementing the experimentally constrained γ-ray strength function with the zero-limit E1 and M1 contributions for the de-excitation mode, we estimate the Maxwellian-averaged cross section for the s-process branching-point nucleus Tl204 in the context of the Pb205-Tl205 chronometry.