Measurement of weak rates for stellar evolution via the (t,3He) reaction

✍ Scribed by R.G.T. Zegers

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 848 KB
• Volume: 787
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2006.12.052

✦ Synopsis

The (t, 3 He) charge-exchange reaction has been developed as a tool to extract Gamow-Teller strengths on nuclei of importance for stellar evolution. A secondary triton beam of 115 MeV/nucleon is used, either produced from a primary α beam, or, since recently, from a primary 16 O beam. Here, the (t, 3 He) reaction is used to study the Gamow-Teller strength distribution in 58 Co via the 58 Ni(t, 3 He) reaction. The experimental results are compared with calculations in large-scale shell models using the kb3g and gxpf1 interactions, as well as existing data from 58 Ni(n, p) and 58 Ni(d, 2 He) experiments. The differences between the data and theoretical models are studied in terms of electron-capture rates in the pre-collapse stages of core-collapse supernovae.