Study of astrophysically important resonant states in 26Si by the 28Si(4He,6He)26Si reaction

The emission of 1.809 MeV gamma-ray from the first excited state of ²⁶Mg followed by betadecay of ²⁶Al in its ground state (denoted as ²⁶Alg.s.) has been identified by gamma-ray telescopes such the Compton Gamma-Ray Observatory (CGRO) [1]. To resolve controversy over the possible sources of the observational 1.809 MeV gamma-rays, one needs accurate knowledge of the production rate of ²⁶Al. The ²⁵Al(p,γ )²⁶Si reaction which is the competition reaction for production of ²⁶Alg.s. is one of the important subjects to be investigated. In this work, the astrophysically important ²⁶Si states above the proton threshold were studied via the ²⁸Si( ⁴He,⁶He)²⁶Si reaction. We have preformed an angular distribution measurement using the high resolution QDD spectrograph (PA) at Center for Nuclear Study (CNS), University of Tokyo. The experimental results and data analysis will be presented. © Copyright owned by the author(s).