$^{18}$ Ne中关键6.15 MeV态的自旋宇称确认
A confirmative spin-parity assignment for the key 6.15 MeV state in $^{18}$Ne of astrophysical importance
摘要：
用$^{17}$ F+ $p$的共振弹性散射研究了$^{18}$ Ne中质子的共振态.用CNS放射性离子束分离器（CRIB）分离出$^{17}$ F束流，以3.6 MeV/核子的能量轰击H $_2$厚靶。用三套$Δ$ E-E Si望远镜分别在$θ$ $_{lab}$ $\approx 3^\circ$、10 $^\circ$和18 $^\circ$的散射角下测量了反冲光粒子。四个共振，{ \it，即}，在$E_{x}$ =6.15、6.30、6.85和7.05 MeV时，清楚地观察到了。通过对激发函数的$R$矩阵分析，将$J^π$ =1的$^-$归属于计算$^{14}$ O（$α$，$p$）$^{17}$ F反应速率的关键态6.15 MeV。该反应被认为是I型X射线暴中从热CNO循环突破到$rp$过程的最可能的关键反应之一。此外，在$E_{x}$ =6.85 MeV处观察到的一个新的激发态被暂定为0 $^{-}$，它可能是镜像$^{18}$ O中6.880 MeV，0 $^{-}$的模拟态。
英文摘要：
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 $Δ$E-E Si telescope at scattering angles of $θ$$_{lab}$$\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, $J^π$=1$^-$ was firmly assigned to the 6.15 MeV state which is a key state in calculating the reaction rate of $^{14}$O($α$,$p$)$^{17}$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.
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