利用^(22)Na+p厚靶弹性散射研究^(23)Mg质子共振态  

Study of the Proton Resonant States in ^(23)Mg via ^(22)Na+p Thick-target Elastic Scattering

作　　者：张玉强 景龙[2] 王友宝[1] 胡钧[2] 韩治宇[1] 李云居[1] 李志宏[1] 连钢[1] 谌阳平 颜胜权[1] 曾晟[1] 郭冰[1] 柳卫平[1] 白真[2] 贾宝路 金仕纶[2] 马军兵[2] 马朋[2] 马少波 许世伟[2] 杨彦云[2] 张宁涛[2] 唐晓东 张立勇[2] 苏俊 何建军 孙立杰[4] 黄美容 王建松 王宏伟[7] ZHANG Yuqiang;JING Long;WANG Youbao;HU Jun;HAN Zhiyu;LI Yunju;LI Zhihong;LIAN Gang;SHEN Yangping;YAN Shenquan;ZENG Sheng;GUO Bing;LIU Weiping;BAI Zhen;JIA Baolu;JIN Shilun;MA Junbing;MA Peng;MA Shaobo;XU Shiwei;YANG Yanyun;ZHANG Ningtao;TANG Xiaodong;ZHANG Liyong;SU Jun;HE Jianjun;SUN Lijie;HUANG Meirong;WANG Jiansong;WANG Hongwei(China Institute of Atomic Energy,Beijing 102413,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Nuclear and Particle Physics,Shanghai Jiao Tong University,Shanghai 200240,China;College of Physics and Electronic Information,Inner Mongolia Minzu University,Tongliao 028000,Inner Mongolia Autonomous Region,China;School of Science,Huzhou University,Huzhou 313000,Zhejiang,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]中国科学院近代物理研究所,兰州730000 [3]北京师范大学核科学与技术学院,北京100875 [4]上海交通大学粒子与核物理研究所,上海200240 [5]内蒙古民族大学物理与电子信息学院,内蒙古通辽028000 [6]湖州师范学院理学院,浙江湖州313000 [7]中国科学院上海应用物理研究所,上海201800

出　　处：《原子核物理评论》2024年第4期936-942,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(12275361,U2267205)。

摘　　要：^(22)Na(p,γ)^(23)Mg和19Ne(α,p)^(22)Na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^(23)Mg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^(22)Na+p厚靶逆运动学弹性散射方法对复合核^(23)Mg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^(22)Na(p,p)的激发函数,发现了复合核^(23)Mg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^(23)Mg的22条质子共振态的共振参数,为进一步计算^(19)Ne(α,p)^(22)Na反应的天体物理反应率奠定了基础。^(22)Na(p,γ)^(23)Mg and 19Ne(α,p)^(22)Na 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 ^(23)Mg may be involved at nova temperature,existing measurements can only provide partial effective information on the ^(22)Na(p,γ)^(23)Mg reaction,large discrepancies still exist in the astrophysical reaction rates of the two reactions.In the present work,^(22)Na+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 ^(22)Na(p,p)are obtained in the energy range of Ec.m.=1.5 to 4 MeV.Obvious resonance structure is observed in the ^(23)Mg compound nucleus,resonance parameters are deduced for 22 proton resonance states in ^(23)Mg via R-matrix analysis,which will be used for the evaluation of the astrophysical reaction rates of ^(22)Na(p,γ)^(23)Mg and ^(19)Ne(α,p)^(22)Na.

关 键 词：新星核合成 天体物理反应率 共振散射 厚靶逆运动学方法 

分 类 号：O571.53[理学—粒子物理与原子核物理]