Measurement of (n, γ) reaction cross sections at stellar energies for 58Ni and 78Se

✍ Scribed by G. Rugel; I. Dillmann; T. Faestermann; M. Heil; F. Käppeler; K. Knie; G. Korschinek; W. Kutschera; M. Poutivtsev; A. Wallner

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 168 KB
• Volume: 259
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2007.01.206

✦ Synopsis

The energy averaged (n, c) cross sections of 58 Ni and 78 Se at a stellar energy of kT = 25 keV have been investigated with the so called activation technique, which represents a well established tool for measurements of stellar neutron cross sections. For both nuclides, offline decay counting is prohibitive due to the long half-lives of the reaction products as well as the absence of suitable c-ray transitions. The measurements reported here are, therefore, based on accelerator mass spectrometry (AMS) determination of the number of 59 Ni and 79 Se nuclei produced by irradiation of Ni and Se targets in a quasi-stellar neutron spectrum. We present in this paper preliminary results of r exp (kT = 25 keV) = 27.2 ± 1.8 mb and 61 ± 10 mb for neutron capture cross sections of 58 Ni and 78 Se, respectively.