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.
| Original language | English |
|---|---|
| Article number | 035805 |
| Journal | Physical Review C |
| Volume | 99 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 29 2019 |
Funding
This research was supported in part by the National Science Foundation Grants No. PHY-1419765 (Notre Dame) and No. PHY-1404218 (Rutgers), the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Cooperative Agreement No. DE-NA002132, and by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2016R1A5A1013277 and No. NRF-2013M7A1A1075764). The authors also acknowledge support from the DOE Office of Science, Office of Nuclear Physics, under Contracts No. DE-AC05-00OR22725, No. DE-FG02-96ER40963, No. DE-FG02-96ER40978, and No. DE-AC02-06CH11357. This research used resources of Argonne National Laboratory's ATLAS facility, which is a DOE Office of Science User Facility.