ηproduction in proton-nucleus collisions near threshold

The η-meson production in proton-nucleus(pA)collisions near threshold is studied within a relativistic 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(ηN).Taking 18O and 12C nuclei as examples,we evaluate the production 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.

作 者： YANG You-Chang CHEN Hong JIANG Huan-Qing   作者單位： YANG You-Chang(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Department of Physics,Zunyi Normal College,Zunyi,563002,China)

CHEN Hong(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou,730000,China)

JIANG Huan-Qing(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,100049,China;Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou,730000,China) 

刊 名： 中國物理C（英文版）  ISTIC 英文刊名： CHINESE PHYSICS C  年，卷(期)： 2008 32(4)  分類號：   關鍵詞： η meson   proton-nucleus collision   N*(1535)  

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