학술논문
Photoneutron cross sections for Ni isotopes: Toward understanding $(n,\gamma)$ cross sections relevant to the weak s-process nucleosynthesis
Document Type
Working Paper
Author
Utsunomiya, H.; Renstrøm, T.; Tveten, G. M.; Goriely, S.; Katayama, S.; Ari-izumi, T.; Takenaka, D.; Symochko, D.; Kheswa, B. V.; Ingeberg, V. W.; Glodariu, T.; Lui, Y. -W.; Miyamoto, S.; Larsen, A. C.; Midtbø, J. E.; Görgen, A.; Siem, S.; Campo, L. Crespo; Guttormsen, M.; Hilaire, S.; Péru, S.; Koning, A. J.
Source
Phys. Rev. C 98, 054619 (2018)
Subject
Language
Abstract
Photoneutron cross sections were measured for $^{58}$Ni, $^{60}$Ni, $^{61}$Ni, and $^{64}$Ni at energies between the one-neutron and two-neutron thresholds using quasi-monochromatic $\gamma$-ray beams produced in laser Compton-scattering at the NewSUBARU synchrotron radiation facility. The new photoneutron data are used to extract the $\gamma$-ray strength function above the neutron threshold complementing the information obtained by the Oslo method below the threshold. We discuss radiative neutron capture cross sections and the Maxwellian-averaged cross sections for Ni isotopes including $^{63}$Ni, a branching point nucleus along the weak s-process path. The cross sections are calculated with the experimentally constrained $\gamma$-ray strength functions from the Hartree-Fock-Bogolyubov plus quasi-particle-random phase approximation based on the Gogny D1M interaction for both $E1$ and $M1$ components and supplemented with the $M1$ upbend.
Comment: 9 pages, 7 figures, re-submitted to PRC
Comment: 9 pages, 7 figures, re-submitted to PRC