The η-meson production in proton-nucleus （pA） collisions near threshold is studied within a rela- tivistic meson-exchange model. The primary production amplitude is presented in the distorted-wave impulse approxima...The η-meson production in proton-nucleus （pA） collisions near threshold is studied within a rela- tivistic meson-exchange model. The primary production amplitude is presented in the distorted-wave impulse approximation for the nucleus with isospin 0 or 1 by assuming that N^＊（1535） is excited via a meson exchange and then decays into η and nucleon pair（nN）. Taking ISO and 12C nuclei as examples, we evaluate the prouction cross sections as a function of the incident proton energy, and analyze the effects of nuclear medium and various meson-exchange contributions. Finally we discuss implications for further experimental studies at the Cooling Storage Ring （CSR） in Lanzhou.展开更多
基金National Natural Science Foundation of China(10575083,10435080)
文摘The η-meson production in proton-nucleus （pA） collisions near threshold is studied within a rela- tivistic meson-exchange model. The primary production amplitude is presented in the distorted-wave impulse approximation for the nucleus with isospin 0 or 1 by assuming that N^＊（1535） is excited via a meson exchange and then decays into η and nucleon pair（nN）. Taking ISO and 12C nuclei as examples, we evaluate the prouction cross sections as a function of the incident proton energy, and analyze the effects of nuclear medium and various meson-exchange contributions. Finally we discuss implications for further experimental studies at the Cooling Storage Ring （CSR） in Lanzhou.
