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关键天体反应18Ne（α，p）21Na的实验研究
관건천체반응18Ne（α，p）21Na적실험연구
Experimental Study of Key 18Ne(α, p)21Na Astrophysical Reaction

万方数据

原子核物理评论原子覈物理評論 원자핵물리평론
Nuclear Physics Review
2013年 4期 385-390 ,共6页

张立勇%许世伟%何建军%H. Yamaguchi%S. Kubono%Y. Wakabayashi%陈思泽%胡钧%马朋%Y. Togano%T. Hashimoto%D. Kahl%T. Teranishi%陈若富%王宏伟%田文栋%郭冰%S. Hayakawa%N. Iwasa%T. Yamada%T. Komatsubara

장립용%허세위%하건군%H. Yamaguchi%S. Kubono%Y. Wakabayashi%진사택%호균%마붕%Y. Togano%T. Hashimoto%D. Kahl%T. Teranishi%진약부%왕굉위%전문동%곽빙%S. Hayakawa%N. Iwasa%T. Yamada%T. Komatsubara

核天体物理%X射线暴%放射性束%厚靶方法%共振散射覈天體物理%X射線暴%放射性束%厚靶方法%共振散射
핵천체물리%X사선폭%방사성속%후파방법%공진산사
nuclear astrophysics%X-ray burst%radioactive beam%thick target method%resonant scattering

在X射线暴高温高密度的环境中，18Ne(α, p)21Na很可能是由热CNO循环突破到rp过程的一个重要反应。到目前为止，人们测得的反应率还存在很大的不确定性。实验中用CRIB(CNS Radioactive Ion Beam separator)提供的21Na放射性束轰击8.8 mg/cm2的聚乙烯厚靶，利用放置在θlab=-14°，0°，14°处的3套硅条探测器望远镜阵列对反冲轻粒子进行鉴别和测量，测得在一段能区(Ex=5.5～9.2 MeV)内21 Na(p, p)21 Na的激发函数。通过对21 Na(p, p)共振弹性散射截面进行R矩阵拟合，得到了22 Mg共振能级的自旋宇称以及质子宽度等信息，从而为计算18Ne(α, p)21Na反应率提供了实验参数。
재X사선폭고온고밀도적배경중，18Ne(α, p)21Na흔가능시유열CNO순배돌파도rp과정적일개중요반응。도목전위지，인문측득적반응솔환존재흔대적불학정성。실험중용CRIB(CNS Radioactive Ion Beam separator)제공적21Na방사성속굉격8.8 mg/cm2적취을희후파，이용방치재θlab=-14°，0°，14°처적3투규조탐측기망원경진렬대반충경입자진행감별화측량，측득재일단능구(Ex=5.5～9.2 MeV)내21 Na(p, p)21 Na적격발함수。통과대21 Na(p, p)공진탄성산사절면진행R구진의합，득도료22 Mg공진능급적자선우칭이급질자관도등신식，종이위계산18Ne(α, p)21Na반응솔제공료실험삼수。
The 18Ne(α,p)21Na reaction is thought to be one of the key breakout reaction from the hot CNO cycle to the rp-process in X-ray bursts. Over stellar temperatures achieved in XRBs, this rate has not been sufficiently determined. The experiment was performed using CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study (CNS) of the University of Tokyo. An 89 MeV 21Na radioactive ion beam was produced and bombarded an 8.8 mg/cm2 thick polyethylene target. The recoiled light particles were detected with three Micron silicon?E-E telescopes centered at angles ofθlab=0°, +14° and -14° with respect to the beam direction, respectively. The 21Na+p elastic-scattering excitation functions were reconstructed with a thick-target method over energies Ex=5.5～9.2 MeV. The resonance parameters have been determined through an R-matrix analysis,which will be used to evaluate the 18Ne(α, p)21Na reaction rate.