中国物理B ›› 2004, Vol. 13 ›› Issue (6): 836-844.doi: 10.1088/1009-1963/13/6/009

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Electromagnetic dissociation of 3.7 A GeV 16O in nuclear emulsion

李俊生, 张东海, 李振宇, 吴凤娟   

  1. Institute of Modern Physics, Shanxi Teachers' University, Linfen 041004, China
  • 收稿日期:2003-06-06 修回日期:2003-12-18 出版日期:2004-07-05 发布日期:2005-07-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China(Grant No 10275042), the Natural Science Foundation of Shanxi Province (Grant No 20021007) and Shanxi Provincial Foundation for Returned Scholars, China.

Electromagnetic dissociation of 3.7 A GeV 16O in nuclear emulsion

Li Jun-Sheng (李俊生), Zhang Dong-Hai (张东海), Li Zhen-Yu (李振宇), Wu Feng-Juan (吴凤娟)   

  1. Institute of Modern Physics, Shanxi Teachers' University, Linfen 041004, China
  • Received:2003-06-06 Revised:2003-12-18 Online:2004-07-05 Published:2005-07-05
  • Supported by:
    Project supported by the National Natural Science Foundation of China(Grant No 10275042), the Natural Science Foundation of Shanxi Province (Grant No 20021007) and Shanxi Provincial Foundation for Returned Scholars, China.

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摘要： The electromagnetic dissociation (ED) of 3.7 A GeV {}^{16}O in nuclear emulsion is investigated with high statistics. It is found that the electromagnetically dissociated cross section increases with increasing beam energy, the charge distribution of projectile fragments is the same as the results at 60 and 200 A GeV, and the production probability of projectile fragments with charge 3≤Z≤5 is less than that of the other projectile fragments. These results can be well explained by use of Weizsacker and Williams method for calculating the ED contributions. The percentile abundance of various decay modes for ED at 3.7 A GeV is close to the result at 60 and 200 A GeV, but it is different from the result at 14.6 A GeV. The ED of 3.7 A GeV is mainly caused by the giant dipole and quadrupole resonance of E1 and E2, which can be qualitatively explained by the multiplicity distribution of projectile proton in ED. The multiplicity distribution of the α fragments in ED and nuclear events have different functional forms. This difference may be a consequence of the different reaction mechanism involved.

关键词: electromagnetic dissociation, projectile fragments, fragmentation

Abstract: The electromagnetic dissociation (ED) of 3.7 A GeV $^{16}$O in nuclear emulsion is investigated with high statistics. It is found that the electromagnetically dissociated cross section increases with increasing beam energy, the charge distribution of projectile fragments is the same as the results at 60 and 200 A GeV, and the production probability of projectile fragments with charge 3≤Z≤5 is less than that of the other projectile fragments. These results can be well explained by use of Weizsacker and Williams method for calculating the ED contributions. The percentile abundance of various decay modes for ED at 3.7 A GeV is close to the result at 60 and 200 A GeV, but it is different from the result at 14.6 A GeV. The ED of 3.7 A GeV is mainly caused by the giant dipole and quadrupole resonance of E1 and E2, which can be qualitatively explained by the multiplicity distribution of projectile proton in ED. The multiplicity distribution of the α fragments in ED and nuclear events have different functional forms. This difference may be a consequence of the different reaction mechanism involved.

Key words: electromagnetic dissociation, projectile fragments, fragmentation

中图分类号:  (Projectile and target fragmentation)

  • 25.70.Mn
24.30.Cz (Giant resonances) 27.20.+n (6 ≤ A ≤ 19)