1 GeV/nucleon p散射$alpha$中π介子产生的机制
Mechanism of Pion Production in $alpha$p Scattering at 1 GeV/nucleon
摘要：
本文用散射α粒子和次级π介子或质子的同时记录方法研究了能量为4.2GeV的p（α，α ′）X反应中的一π和二π介子的产生。结果表明，在实验能量下，α粒子与质子的非弹性散射要么是通过入射粒子中δ共振的激发和衰变，要么是通过靶质子中Roper共振的激发而进行的，Roper共振主要在I = 0的同位旋S波中的一个核子和一个π介子或一个核子和一个两个π介子的σ介子系统上衰变。
英文摘要：
The one-pion and two-pion production in the p(alpha, alpha prime)X reaction at an energy of E{alpha} = 4.2 GeV has been studied by simultaneous registration of the scattered alpha particles and the secondary pion or proton. The obtained results demonstrate that the inelastic alpha-particle scattering on the proton at the energy of the experiment proceeds either through excitation and decay of Delta resonance in the projectile or through excitation in the target proton of the Roper resonance, which decays mainly on a nucleon and a pion or a nucleon and a sigma meson - system of two pions in the isospin I = 0, S-wave.
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