17 F + p 厚靶实验对 18 Ne共振态性质的研究

Abstract

实验通过17F+p共振弹性散射研究了复合核18Ne激发态中与天体核反应14O(α， p)17F相关的共振态性质。利用兰州放射性束流线(RIBLL)对弹核碎裂反应产生的放射性束17F进行了分离和提纯。经过降能后，能量为4.22 AMeV 的17F束流轰击在T2终端的厚氢靶(CH2)n上。 两套∆E-E Si探测器望远镜放置在两个不同的探测角度θlab≈2.3°和14°上，对反冲质子的角度和能量进行了测量。实验观测到了复合核18Ne的几条质子共振能级。通过R-Matrix理论程序对激发函数进行拟合，得到了共振态的能量、 自旋、 宇称和衰变宽度等共振参数。 Resonant properties in18Ne relevant to the stellar reaction of 14O(α, p)17F have been investigated through a resonant elastic scattering of 17F+p. The 17F RI beam was produced via a projectilefragmentation reaction， and subsequently separated and purified by Radioactive Ion beam Line in Lanzhou(RIBLL). After a series of energy degradation，a 4.22 AMeV 17F beam bombarded a thick(CH2)ntarget at T2 terminal. Energy and angle of the recoiled protons were measured by two sets of ∆E-E silicon telescope at θlab≈2.3°，14° respectively. Several resonances in 18Ne were observed，and their resonant parametersincluding energy，spinparity and decay width have been determined by an R-Matrix analysis of the experimental excitation function.