标题： 介子和轴子自由度在A($\vec{e},e'\vec{p}$)反应中的研究 at $0.2 \leq Q^2 \leq 0.8 (GeV/c)^2$ 显示英文标题

标题： Meson and Isobar Degrees of Freedom in A($\vec{e},e'\vec{p}$) reactions at $0.2 \leq Q^2 \leq 0.8 (GeV/c)^2$

摘要： 介子和重子自由度在A($\vec{e},e'\vec{p}$)和A(e,e'n)中的影响被研究，四动量转移Q^2的范围在0.2到0.8 (GeV/c)^2之间。计算是在非相对论框架下进行的，包括显式的(N,\Delta ,\pi )自由度。对于所研究的动量转移整个范围，介子交换和重子自由度的相对影响是显著的。在低缺失动量和准弹性条件下，注意到(e,e'p)和(e,e'n)微分截面有减少的趋势。最大的敏感性发现在干涉结构函数$W_{LT}$和$W_{TT}$中。另一方面，反冲极化观测量受到介子交换和$\Delta$-重子电流的影响较为适中。 显示英文摘要

摘要： The effect of meson and isobar degrees of freedom in A($\vec{e},e'\vec{p}$) and A(e,e'n) is studied for four-momentum transfers Q^2 in the range between 0.2 and 0.8 (GeV/c)^2. The calculations are performed in a non-relativistic framework with explicit (N,\Delta,\pi) degrees-of-freedom. For the whole range of momentum transfers under investigation the relative effect of the meson-exchange and isobar degrees of freedom is significant. At low missing momenta and quasi-elastic conditions, a tendency to reduce the (e,e'p) and (e,e'n) differential cross sections is noticed. The greatest sensitivity is found in the interference structure functions $W_{LT}$ and $W_{TT}$. The recoil polarization observables, on the other hand, are moderately affected by the meson-exchange and $\Delta$-isobar currents.