Spectroscopic structure of exotic Na-19 - Astrophysics implication
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abstract
The structure of proton-rich isotope 19Na was studied in resonance elastic scattering of a radioactive 18Ne beam on a proton target using inverse-kinematics method. Only one state of 19Na (the second excited state) was observed. A combined R-matrix and potential model analysis was performed. The spin-parity assignment of the second excited state was confirmed to be 1/2 +. We show that the position of the 1/2 + state significantly affects the astrophysicaly important 18Ne(2p,) reaction rate through that state but the totalreaction rate remains unchanged 2p-capture on 18Ne proceeds mostly via the ground and first excited states in 19Na at stellar temperatures. 2006 American Institute of Physics.
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CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS: 12th International Symposium