The Mg24+C12 fusion reaction was used to perform a detailed γ-ray spectroscopy study of the astrophysically important nucleus Ar34. In particular, an experimental setup, coupling the advanced γ-ray tracking array GRETINA with the well-established Argonne fragment mass analyzer (FMA), was employed to obtain excitation energies and spin-parity assignments for excited states in Ar34, both above and below the proton separation energy. For the first time, an angular distribution analysis of in-beam γ rays from fusion-evaporation reactions, using a tracking array, has been performed and Coulomb energy differences of analog states in the T=1, A=34 mirror system, explored from 0 to 6 MeV. Furthermore, we present a comprehensive discussion of the astrophysical Cl33(p,γ) stellar reaction rate, together with implications for the identification of nova presolar grains from sulfur isotopic abundances.
Publication Source (Journal or Book title)
Physical Review C
Kennington, A., Lotay, G., Doherty, D., Seweryniak, D., Andreoiu, C., Auranen, K., Carpenter, M., Catford, W., Deibel, C., Hadyńska-Klk, K., Hallam, S., Hoff, D., Huang, T., Janssens, R., Jazrawi, S., José, J., Kondev, F., Lauritsen, T., Li, J., Rogers, A., Saiz, J., Savard, G., Stolze, S., Wilson, G., & Zhu, S. (2021). Level structure of the Tz=-1 nucleus Ar 34 and its relevance for nucleosynthesis in ONe novae. Physical Review C, 103 (3) https://doi.org/10.1103/PhysRevC.103.035805