【摘要】 ²²Na（p, γ）²³Mg和¹⁹Ne（α, p）²²Na是新星环境下NeNa-MgAl循环以及rp-过程的两个关键反应，对于理解新星的演化和元素核合成有重要意义。因为涉及奇A核²³Mg质子分离阈上的众多共振能级，目前这两个反应的反应率仍有较大分歧。在兰州重离子加速器国家实验室的RIBLL1放射性束流线上，利用²²Na+p厚靶逆运动学弹性散射方法对复合核²³Mg的质子共振态进行了测量，获得了质心系能量1.5～4 MeV区间²²Na（p,p）的激发函数，发现了复合核²³Mg明显的质子共振态结构，利用R-矩阵理论分析确定了复合核²³Mg的22条质子共振态的共振参数，为进一步计算¹⁹Ne（α, p）²²Na反应的天体物理反应率奠定了基础。更多还原

【Abstract】 ²²Na（p, γ）²³Mg and ¹⁹Ne（α, p）²²Na are two crucial reactions in the so-called NeNa-MgAl cycle and the rapid-proton process, their astrophysical reaction rates are indispensable inputs in understanding the outburst mechanism and element synthesis of novae. Since many proton resonance levels in odd-A compound nucleus ²³Mg may be involved at nova temperature, existing measurements can only provide partial effective information on the ²²Na（p, γ）²³Mg reaction, large discrepancies still exist in the astrophysical reaction rates of the two reactions. In the present work, ²²Na+p resonance scattering via thick target inverse kinematics was studied at RIBLL1 radioactive beam line in the HIRFL national laboratory at Lanzhou. Excitation functions of ²²Na（p, p） are obtained in the energy range of E_c.m.= 1.5 to 4 MeV. Obvious resonance structure is observed in the ²³Mg compound nucleus, resonance parameters are deduced for 22 proton resonance states in ²³Mg via R-matrix analysis, which will be used for the evaluation of the astrophysical reaction rates of ²²Na（p, γ）²³Mg and ¹⁹Ne（α, p）²²Na.更多还原