Speaker
Description
Knowledge of the $^{19}$Ne resonance information near the proton threshold (E$_{x}$=6.410 MeV) is important for studying the $^{18}$F($p$,$\alpha$)$^{15}$O nuclear reaction rate in a classical nova [1-4]. Several states in the vicinity of the proton threshold still have not been observed in $^{19}$Ne but were predicted by assuming isospin symmetry from its mirror state in $^{19}$F [5,6]. The $\alpha$-elastic scattering experiment in a Thick Target Inverse Kinematics method (TTIK) was performed at RIKEN using the CNS RI Beam separator (CRIB) with a $^{15}$O radioactive beam for investigating the $^{19}$Ne level structure [7,8]. Two missing states were identified near the proton threshold, and one of the missing states affects the $^{18}$F($p$,$\alpha$)$^{15}$O reaction rate. Additionally, the candidates of rotational bands for the alpha cluster structure were measured. Experimental details and results will be discussed in the presentation.
[1] J. Jose et al., Eur. Phys. J. A 27, 107 (2006).
[2] A. Coc et al., Astron. and Astrophys. 357, 561 (2000).
[3] K. Chae et al., Phys. Rev. C 74, 012801 (2006).
[4] D. Kahl et al., Astron. and Astrophys. 653. A64 (2021).
[5] N. C. Shu et al., Phys. Rev. C 58, 1354 (1998).
[6] C. D. Nesaraja et al., Phys. Rev. C 75, 055809 (2007).
[7] Y. Yanagisawa et al., Nucl. Instrum. Methods Phys. Res. A 539, 74 (2005).
[8] H. Yamaguchi et al., Nucl. Instrum. Methods Phys. Res. A. 589, 150 (2008).
