中国物理B ›› 2009, Vol. 18 ›› Issue (2): 531-536.doi: 10.1088/1674-1056/18/2/024

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Helium production from 84Kr-- and 197Au--emulsion interactions at high energies

张东海, 程锦霞, 成宾, 王芳, 王琦, 张海青, 许蓉, 贾会明, 李雪琴   

  1. Institute of Modern Physics, Shanxi Normal University, Linfen 041004, China
  • 收稿日期:2008-03-06 修回日期:2008-06-24 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10475054 and 10675077), the Foundation for Key Program of Ministry of Education of China (Grant No 2 05026), the Natural Science Foundation of Shanxi Province, China (Grant N

Helium production from 84Kr-- and 197Au--emulsion interactions at high energies

Zhang Dong-Hai(张东海)†, Cheng Jin-Xia(程锦霞), Cheng Bin(成宾), Wang Fang(王芳), Wang Qi(王琦), Zhang Hai-Qing(张海青), Xu Rong(许蓉), Jia Hui-Ming(贾会明), and Li Xue-Qin(李雪琴)   

  1. Institute of Modern Physics, Shanxi Normal University, Linfen 041004, China
  • Received:2008-03-06 Revised:2008-06-24 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10475054 and 10675077), the Foundation for Key Program of Ministry of Education of China (Grant No 2 05026), the Natural Science Foundation of Shanxi Province, China (Grant N

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摘要： The properties of the relativistic helium fragments produced in interactions of 84Kr at 1.8 A GeV and 197Au at 10.7 A GeV in emulsion are investigated. The experimental results are compared with those obtained from various projectiles with emulsion collisions at different energies. It is found that the multiplicity distribution of helium projectile fragments (HPFs) is well described by the Koba--Nielsen--Olesen (KNO) scaling presentation. The second Mueller moment f2 of the HPF multiplicity distribution is independent of the projectile energy for the same projectile, but it is dependent on the projectile mass number. The value of f2 increases with the increase of projectile mass number Ap. The negative value of f2, when Ap<69, means that the emission of HPFs is anticorrelated, but positive value of f2, when Ap>69, refers to that the emission of HPFs is correlated. The non-zero f2 moment in this experiment implies the strong correlation existing between the HPFs.

关键词: relativistic heavy-ion collisions, projectile fragmentation, nuclear emulsion

Abstract: The properties of the relativistic helium fragments produced in interactions of 84Kr at 1.8 A GeV and 197Au at 10.7 A GeV in emulsion are investigated. The experimental results are compared with those obtained from various projectiles with emulsion collisions at different energies. It is found that the multiplicity distribution of helium projectile fragments (HPFs) is well described by the Koba--Nielsen--Olesen (KNO) scaling presentation. The second Mueller moment f2 of the HPF multiplicity distribution is independent of the projectile energy for the same projectile, but it is dependent on the projectile mass number. The value of f2 increases with the increase of projectile mass number Ap. The negative value of f2, when Ap<69, means that the emission of HPFs is anticorrelated, but positive value of f2, when Ap>69, refers to that the emission of HPFs is correlated. The non-zero f2 moment in this experiment implies the strong correlation existing between the HPFs.

Key words: relativistic heavy-ion collisions, projectile fragmentation, nuclear emulsion

中图分类号:  (Particle and resonance production)

  • 25.75.Dw
25.70.Mn (Projectile and target fragmentation) 27.50.+e (59 ≤ A ≤ 89) 27.60.+j (90 ≤ A ≤ 149) 21.65.-f (Nuclear matter)