A confirmative spin-parity assignment for the key 6.15 MeV state in
$^{18}$Ne of astrophysical importance
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abstract
Proton resonant states in $^{18}$Ne have been investigated by the resonant
elastic scattering of $^{17}$F+$p$. The $^{17}$F beam was separated by the CNS
radioactive ion beam separator (CRIB), and bombarded a thick H$_2$ gas target
at 3.6 MeV/nucleon. The recoiled light particles were measured by using three
sets of ${\Delta}$E-E Si telescope at scattering angles of
$\theta$$_{lab}$$\approx 3^\circ$, 10$^\circ$ and 18$^\circ$, respectively.
Four resonances, {\it i.e.}, at $E_{x}$=6.15, 6.30, 6.85, and 7.05 MeV, were
observed clearly. By $R$-matrix analysis of the excitation functions,
$J^{\pi}$=1$^-$ was firmly assigned to the 6.15 MeV state which is a key state
in calculating the reaction rate of $^{14}$O($\alpha$,$p$)$^{17}$F reaction.
This reaction was thought to be one of the most probable key reactions for the
breakout from the hot-CNO cycle to the $rp$-process in type I x-ray bursts In
addition, a new excited state observed at $E_{x}$=6.85 MeV was tentatively
assigned as 0$^{-}$, which could be the analog state of 6.880 MeV, 0$^{-}$ in
mirror $^{18}$O.
