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  • 标题:Activation Measurement of the 19F(n,γ)20F cross section
  • 本地全文:下载
  • 作者:E. Uberseder ; M. Heil ; F. Käppeler
  • 期刊名称:PoS - Proceedings of Science
  • 印刷版ISSN:1824-8039
  • 出版年度:2006
  • 出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
  • 摘要:Much progress has been made in the study of the production and destruction mechanisms of 19F. Recent model simulations indicate that the 19F(n, g)20F reaction could be the primary destruction channel for fluorine during the thermal pulses of AGB stars, therefore an accurate determination of the neutron capture cross section is of great importance. An activation measurement of the neutron capture cross section of 19F has been performed at a stellar temperature of kT = 25 keV using the Karlsruhe 3.7 MV Van de Graaff accelerator. The short half life of 20F (t1/2 = 11 s) required the employment of the fast cyclic activation technique. A preliminary analysis indicates a significantly lower neutron capture cross section at kT = 25 keV than is suggested in the current literature. The new mesurement also greatly reduces the quoted uncerainty of 20%.
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