Particle decays of levels in 12N11 and 12O investigated with the invariant-mass method
Abstract
Particle-decaying states of the light nuclei 12N11 and 12O were studied using the invariant-mass method. The decay energies and intrinsic widths of a number of states were measured, and the momentum correlations of three-body decaying states were considered. A second 2 p -decaying 2+ state of 12O was observed for the first time, and a higher-energy 12O state was observed in the 4 p +2 α decay channel. This 4 p +2 α channel also contains contributions from fissionlike decay paths, including g .s . 6Be + g .s . 6Be. Analogs to these states in 12O were found in 12N in the 2 p +10B and 2 p +α +6Li channels. The momentum correlations for the prompt 2 p decay of g .s . 12O were found to be nearly identical to those of g .s . 16Ne, and the correlations for the new 2+ state were found to be consistent with sequential decay through excited states in 11N. The momentum correlations for the 21+ state in 12O provide a new value for the 11N ground-state energy. The states in 12N/12O that belong to the A =12 isobaric sextet do not deviate from the quadratic isobaric multiplet mass equation form.
- Publication:
-
Physical Review C
- Pub Date:
- August 2019
- DOI:
- 10.1103/PhysRevC.100.024306
- arXiv:
- arXiv:1906.11347
- Bibcode:
- 2019PhRvC.100b4306W
- Keywords:
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- Nuclear Experiment
- E-Print:
- 16 pages, 16 figures, 7 tables, tables corrected