$^{15}$ F的势垒上窄共振
An above-barrier narrow resonance in $^{15}$F
摘要：
用后加速的强流纯化放射性核束$^{14}$ O研究了游离$^{15}$ F核的低激发态。利用第二激发态厚靶逆运动学中的共振弹性散射，首次高精度地测量了E $\_R$ =4.757（6）（10）MeV，宽度为$Γ$ =36（5）（14）keV的共振。在耦合沟道表象下，用伽莫夫壳模型研究了位于质子滴线外两个中子处的原子核中的这种窄势垒以上态的结构，该核具有一个$^{12}$ C核和三价质子.发现它是$2s\_{1/2}$壳层中两个准束缚质子的几乎纯波函数。
英文摘要：
Intense and purified radioactive beam of post-accelerated $^{14}$O was used to study the low-lying states in the unbound $^{15}$F nucleus. Exploiting resonant elastic scattering in inverse kinematics with a thick target, the second excited state, a resonance at E$\_R$=4.757(6)(10)~MeV with a width of $Γ$=36(5)(14)~keV was measured for the first time with high precision. The structure of this narrow above-barrier state in a nucleus located two neutrons beyond the proton drip line was investigated using the Gamow Shell Model in the coupled channel representation with a $^{12}$C core and three valence protons. It is found that it is an almost pure wave function of two quasi-bound protons in the $2s\_{1/2}$ shell.
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