Document Type
Article
Publication Date
3-29-2019
Abstract
The O15(α,γ)Ne19 reaction is responsible for breakout from the hot CNO cycle in type I x-ray bursts. Understanding the properties of resonances between Ex=4 and 5 MeV in Ne19 is crucial in the calculation of this reaction rate. The spins and parities of these states are well known, with the exception of the 4.14- and 4.20-MeV states, which have adopted spin-parities of 9/2- and 7/2-, respectively. γ-ray transitions from these states were studied using triton-γ-γ coincidences from the F19(He3,tγ)Ne19 reaction measured with the GODDESS (Gammasphere ORRUBA Dual Detectors for Experimental Structure Studies) at Argonne National Laboratory. The observed transitions from the 4.14- and 4.20-MeV states provide strong evidence that the Jπ values are actually 7/2- and 9/2-, respectively. These assignments are consistent with the values in the F19 mirror nucleus and in contrast to previously accepted assignments.
Publication Source (Journal or Book title)
Physical Review C
Recommended Citation
Hall, M., Bardayan, D., Baugher, T., Lepailleur, A., Pain, S., Ratkiewicz, A., Ahn, S., Allen, J., Anderson, J., Ayangeakaa, A., Blackmon, J., Burcher, S., Carpenter, M., Cha, S., Chae, K., Chipps, K., Cizewski, J., Febbraro, M., Hall, O., Hu, J., Jiang, C., Jones, K., Lee, E., O'Malley, P., Ota, S., Rasco, B., Santiago-Gonzalez, D., Seweryniak, D., Sims, H., Smith, K., Tan, W., Thompson, P., & Thornsberry, C. (2019). New γ -ray transitions observed in Ne 19 with implications for the O 15 (α,γ) Ne 19 reaction rate. Physical Review C, 99 (3) https://doi.org/10.1103/PhysRevC.99.035805