摘要
在p(α,α′)πN反应的几种反应机制中研究N 激发,利用蒙卡模拟的办法重现N (1440)共振峰的位置,在给定入射能量情况下模拟出末态各出射粒子的动量分布、角分布情况。计算结果可以在πN的不变质量谱中观察到明显的N (1440)共振峰,同时达里兹图在πN系统能量平方为2100MeV2附近事件分布密集,而别的组态却没有观察到这些情况,这都说明了πN共振粒子N (1440)的产生。
We study the roper N~*(1440) excitation in the p(α,α′)πN reaction and reproduce the peak position N~*(1440) of resonance in the target by using Monte Carlo simulation approach .Given a definite beam energy we could simulate the momentum distributions and angular distributions of final particles.By calculating one can observe the N~*(1440) resonance peak obviously in the invariant mass spectrum ,also ,the events distribution is dense at 2 100 MeV^2 of πN system energy square in Dalitz plots .But there are no such phenomenon in other composed systems. All of those things indicate that N*(1440) produced.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第1期128-130,134,共4页
Journal of Chongqing University
基金
国家自然科学基金资助项目(10147208).
