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质子与4He核碰撞反应中N*(1440)的共振激发

N* (1 440) Resonance Production in the Collision Reaction of Proton and 4He Nucleus
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摘要 在介子交换模型下,考虑质子入射动能为2.8GeV时,对p+4 He→p+π+4 He反应中共振激发N*(1 440)(Roper共振态)进行了研究,在π介子与核子不变质量为1 440MeV附近重现了Roper共振峰;得出了末态π介子的角分布和动量分布,讨论了在兰州重离子冷却储存环(CSR)上开展该实验研究的可行性. Based on the meson-exchange model, the excited nucleon N* (1 440) was studied in the reaction channel p+4 He→p+π+4 He, when the kinetic energy of the incoming proton was 2.8 GeV. The peak of Roper resonance was reproduced perfectly near 1 440 MeV of invariant mass of the πN system, and the an-gle distribution and the momentum distribution of the final-state π pion were obtained. The feasibility ofexperimental study of N* (1 440) resonance at the Cooling Store Ring (CSR) of Lanzhou is discussed.
出处 《西南大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第7期43-47,共5页 Journal of Southwest University(Natural Science Edition)
基金 国家自然科学基金资助项目(11047023) 贵州省教育厅自然科学类科研重点资助项目(黔教科20100084) 贵州省科学技术基金资助项目(黔科合J字[2011]2364号) 贵州省重点支持学科(黔教高发〔2011〕275号) 合肥师范学院博士基金资助项目
关键词 Roper共振态 散射截面 不变质量 Roper resonance scattering cross section invariant mass
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