| η production in proton-nucleus collisions near threshold |
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| 引用本文： | 杨友昌,陈洪,姜焕清.η production in proton-nucleus collisions near threshold[J].中国物理 C,2008,32(4):254-258. |
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| 作者姓名： | 杨友昌 陈洪 姜焕清 |
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| 作者单位： | School of Physical Science and Technology Southwest University，School of Physical Science and Technology，Southwest University，School of Physical Science and Technology，Southwest University，Chongqing 400715，China Department of Physics，Zunyi Normal College，Zunyi 563002，China，Chongqing 400715，China Center of Theoretical Nuclear Physics，National Laboratory of Heavy Ion Accelerator，Lanzhou 730000，China，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 |
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| 基金项目： | National Natural Science Foundation of China(10575083,10435080) |
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| 摘 要： | 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
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| 关 键 词： | η meson proton-nucleus collision N*(1535) |
| 收稿时间： | 2007-6-21 |
| 修稿时间： | 2007-7-30 |
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