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60 A GeV16O原子核在核乳胶中的电磁离解

张东海 孙汉城

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60 A GeV16O原子核在核乳胶中的电磁离解

张东海, 孙汉城

ELECTROMAGNETIC DISSOCIATION OF 60 A GeV16O IN EMULSION

ZHANG DONG-HAI, SUN HAN-CHENG
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  • 对60 A GeV16O在原子核乳胶中的电磁离解现象首次进行了高统计的研究,得到电磁离解截面随束流能量的增加而增加,射弹碎片电荷分布和200 A GeV16O在 乳胶中电磁离解的电荷分布一致,但电荷为3≤Z≤5的射弹碎片的发射概率低于200 A GeV能 区,这些特点和Weiszacker和Williams的经典电磁理论模型计算结果一致.60 A GeV16 O电磁离解下各反应道出现的概率和200 A GeV能区结果基本一致,但同14.6
    The electromagnetic dissociations (EDs) of 60 A GeV16O in nuclear emu lsion is investigated with high statistics for the first time. It is found that the interaction cross section for EDs increases with increasing beam energy, and the charge distribution of projectile fragments is the same as the results at 2 00 A GeV, but the production probability of projectile fragments with charge 3≤ Z≤5 is smaller than that of the results at 200 A GeV. These results can be expl ained by use of the Weizscker-Williams method for calculating the EDs contributi ons. The percentage abundances of various decay modes for EDs at 60 A GeV is the same as the results at 200 A GeV,but different from the results at 14.6 A GeV. The EDs of 60 A GeV16O is mainly caused by the giant dipole and quadr upole resonance of E1 and E2 and by the quasi deuteron effect, which can be qual itatively explained by the multiplicity distribution of projectile fragmentation proton in EDs. The multiplicity distribution of α fragments in EDs and nuclear events have different functional forms. This difference may be a consequence of the different reaction mechanisms involved in EDs and nuclear events.
    • 基金项目: 山西省青年科学基金(批准号:991004)和山西省归国人员基金资助的课题.
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出版历程
  • 收稿日期:  2000-01-30
  • 刊出日期:  2000-05-05

60 A GeV16O原子核在核乳胶中的电磁离解

  • 1. (1)山西师范大学物理系,山西临汾 041004;中国原子能科学研究院,北京 102413; (2)中国原子能科学研究院,北京 102413
    基金项目: 

    山西省青年科学基金(批准号:991004)和山西省归国人员基金资助的课题.

摘要: 对60 A GeV16O在原子核乳胶中的电磁离解现象首次进行了高统计的研究,得到电磁离解截面随束流能量的增加而增加,射弹碎片电荷分布和200 A GeV16O在 乳胶中电磁离解的电荷分布一致,但电荷为3≤Z≤5的射弹碎片的发射概率低于200 A GeV能 区,这些特点和Weiszacker和Williams的经典电磁理论模型计算结果一致.60 A GeV16 O电磁离解下各反应道出现的概率和200 A GeV能区结果基本一致,但同14.6

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