New neutron capture and transmission measurements for 134,136Ba at ORELA and their impact on s-process nucleosynthesis calculations

Autor:	John A. Harvey, R. R. Spencer, Michael Scott Smith, N. W. Hill, R. R. Winters, P. E. Koehler, Klaus H Guber
Rok vydání:	1997
Předmět:	Nuclear physics Physics Reaction rate Nuclear and High Energy Physics Neutron capture Range (particle radiation) Electron linear accelerator Transmission (telecommunications) Nucleosynthesis s-process Lower energy
Zdroj:	Nuclear Physics A. 621:258-261
ISSN:	0375-9474
DOI:	10.1016/s0375-9474(97)00250-9
Popis:	We have made high-resolution neutron capture and transmission measurements on isotopically enriched samples of 134 Ba and 136 Ba at the Oak Ridge Electron Linear Accelerator (ORELA) in the energy range from 20 eV to 500 keV. Previous measurements had a lower energy limit of 3 – 5 keV, which is too high to determine accurately the Maxwellian-averaged capture cross section at the low temperatures (kT ≈ 6 – 12 keV) favored by the most recent stellar models of the s-process. Our results for the astrophysical reaction rates are in good agreement with the most recent previous measurement at the classical s -process temperature, kT = 30 keV, but show significant differences at lower temperatures. We discuss the astrophysical implications of these differences.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::043f9d239d713a350a43e95a37697408 https://doi.org/10.1016/s0375-9474(97)00250-9 Zobrazit plný text záznamu Full Text from ScienceDirect