辐射俘获反应中门态过程的干涉现象  

Interference Phenomenona of Doorday State Procedure in Radiative Capture Reactions

作　　者：赵维娟[1] 杨柳[2] 刘建峰[1] 霍裕昆[3] 

机构地区：[1]郑州大学物理工程学院,郑州450052 [2]焦作教育学院物理系,焦作454152 [3]复旦大学物理二系,上海200433

出　　处：《高能物理与核物理》2001年第9期850-858,共9页High Energy Physics and Nuclear Physics

基　　金：河南省科委基金 (0 0 4 0 5 1 5 0 0 )资助~~

摘　　要：主要计算中子能量为 5— 2 5MeV12 C(n ,γ)反应截面 ,计算结果表明 ,在Ex=1 3MeV处有矮共振存在 ,同时 ,也计算了质子能量为 8— 3 5MeV12 C(p ,γ)反应截面 .计算表明对应13N激发能量为 1 1 .74MeV和 1 4.0 6MeV处反应截面有谷点存在 .这是因为半直接俘获与门态过程中的共振俘获之间有相消干涉效应 。Particle radiative capture cross sections of 12 C(n,γ) and 12 C(p,γ) have been calcaulated at 90° in the neutron energy range of 5—25MeV and proton energy range of 8—35MeV. Pigmy resonance exists at the excitation energy E x=13MeV in 12 C(n,γ) reaction. The dips observed at the excitation energy around 11.74MeV and 14.06MeV in 12 C(p,γ) reaction are attributed to the destructive interference between semidirect capture and fine resonance capture in the process of doorday state. The calculations agree with expermental results.

关 键 词：矮共振 门态过程 相消干涉效应 辐射俘获反应 反应截面 

分 类 号：O571.4[理学—粒子物理与原子核物理]