부산대학교 도서관

The structure of the unbound proton-rich isotope 19.sup.Na was studied in resonance elastic scattering of a radioactive 18.sup.Ne beam on a proton target using the thick-target inverse-kinematics method. The experiment covered the excitation energy range from 0.5 to 2.7 MeV in c.m.s. Only one state of 19.sup.Na (the second excited state) was observed. A combined R-matrix and potential model analysis was performed. The spin and parity assignment of this second excited state was confirmed to be 1/2.sup.+. We show that the position of the 1/2.sup.+ state significantly affects the reaction rate through that state, but the total reaction rate remains unchanged since the 18.sup.Ne(2p, I3) proceeds mostly via the ground and first excited states in 19.sup.Na at stellar temperatures.