Abstract
At low stellar temperatures the energy release due to the CN cycle is regulated by its slowest reaction , the rate of which strongly depends on the subthreshold resonance at , which corresponds to the 6.79 MeV state in . By using the Doppler-shift attenuation method and the reaction to populate the state, we obtained an upper limit on the lifetime of this state of [68.3% confidence level (C.L.)]. In addition we measured the lifetimes of the 6.18 and 6.86 MeV states to be and , respectively (68.3% C.L.), in good agreement with the literature.
3 More- Received 25 April 2014
- Revised 2 July 2014
DOI:https://doi.org/10.1103/PhysRevC.90.035803
©2014 American Physical Society