Chinese Physics C > 1990, Vol. 14 > Issue(S4): 399-406

Fission Measurement on 5.5 to 22 MeV/A²⁸Si +¹⁹⁷Au Systems (I) Linear Momentum Transfer and Angular Distribution off Reaction Plane

1 Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, Gansu, China;
2 Lawrence Berkeley Laboratory, Berkeley, USA

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Abstract：
The velocities and angular distributions of correlated fission fragments emitted from reaction of ¹⁹⁷Au bombarded by a ²⁸Si beam with energies from 5.5 to 21.7 MeV/ Aare measured. The results show that when the incident energy is larger than 10 MeV/ A, the incomplete fusion-fission (ICF) associated with incomplete linear momentum transfer ( LMT) appears. Furthermore, when E _cm> 200 MeV, as a companion of ICF, the sequential fission (SF) with lower LMTthan that of ICF, has apparent yields. By comparing the difference of LMTvalues from ICF and SF, the ratio of SF over total fission cross-section has been obtained. Moreover, the angular distribution off the reaction plane of one fragment and its standard deviation have been obtained. It seems that there is a general linear relationship between the deviation and excitation energy per nucleon in heavier composite systems.

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Dai Guangxi, Qi Yujin, Zheng Jiwen, Liu Ximing, Chen Yuanda, R. Stokstad, J. Pouliot, A. Harmon and D. Digregorio. Fission Measurement on 5.5 to 22 MeV/A ²⁸Si + ¹⁹⁷Au Systems (I) Linear Momentum Transfer and Angular Distribution off Reaction Plane[J]. Chinese Physics C, 1990, 14(S4): 399-406.

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Received: 1989-05-29

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Supported by the National Natural Science Foundation of China.

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Fission Measurement on 5.5 to 22 MeV/A²⁸Si +¹⁹⁷Au Systems (I) Linear Momentum Transfer and Angular Distribution off Reaction Plane

1 Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, Gansu, China;

2 Lawrence Berkeley Laboratory, Berkeley, USA

Received Date:1989-05-29

Fund Project:Supported by the National Natural Science Foundation of China.

Abstract:The velocities and angular distributions of correlated fission fragments emitted from reaction of¹⁹⁷Au bombarded by a²⁸Si beam with energies from 5.5 to 21.7 MeV/Aare measured. The results show that when the incident energy is larger than 10 MeV/A, the incomplete fusion-fission (ICF) associated with incomplete linear momentum transfer (LMT) appears. Furthermore, whenE_cm> 200 MeV, as a companion of ICF, the sequential fission (SF) with lowerLMTthan that of ICF, has apparent yields. By comparing the difference ofLMTvalues from ICF and SF, the ratio of SF over total fission cross-section has been obtained. Moreover, the angular distribution off the reaction plane of one fragment and its standard deviation have been obtained. It seems that there is a general linear relationship between the deviation and excitation energy per nucleon in heavier composite systems.

Fission Measurement on 5.5 to 22 MeV/A²⁸Si +¹⁹⁷Au Systems (I) Linear Momentum Transfer and Angular Distribution off Reaction Plane

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