Transport model studies on the fast fission of the target-like fragments in heavy ion collisions
Transport model studies on the fast fission of the target-like fragments in heavy ion collisions
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重离子碰撞中靶状碎片快速裂变输运模型研究
DOI：
10.1016/j.physletb.2019.134808
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发表时间：
2019-10
影响因子：
4.4
通讯作者：
Xiao Zhigang
中科院分区：
文献类型：
--
作者：
Wu Qianghua;Diao Xinyue;Guan Fenhai;Wang Yijie;Zhang Yingxun;Li Zhuxia;Wu Xizhen;Pomorski Krzysztof;Xiao Zhigang
用改进的量子分子动力学模型（ImQMD）研究了能量为20 ~ 40 MeV/u的重离子（40 Ar+ 197 Au，B= 8 fm）碰撞中类靶碎片（TLF）的裂变. TLF裂变在100 fm/c（10− 21 s）的时间尺度与快裂变发生的图像一致。快裂变的动力学特征由裂变轴的质量不对称性和角分布来描述。讨论了表面能系数和束流能量对裂变动力学特性的影响。在束流能量较高或表面能系数较大时，裂变碎片的质量不对称性较大，裂变轴的角分布在束流方向附近有一个较明显的峰值，同时裂变时间尺度也较短。这种变化表明裂变观测值可以作为探测原子核表面能系数的灵敏探针。与束流能量或表面能系数无关，裂变碎片相对速度的平均值位于2.4cm/ns附近，与Viola系统学在统计裂变中的应用一致。该值可作为所有重离子裂变实验的刻度常数。研究表明，输运模型在描述重离子碰撞中作为大振幅集体运动模式的快裂变方面具有适用性。
The fission of the target-like fragments (TLF) in heavy ion collisions (40 Ar+ 197 Au, b= 8 fm) at beam energies from 20 to 40 MeV/u has been studied by an improved quantum molecular dynamics model (ImQMD). The time scale at a few 100 fm/c (10− 21 s) of the TLF fission is consistent with the picture that fast fission occurs. The dynamic feature of the fast fission is illustrated by the mass asymmetry and the angular distribution of the fission axis. The effect of the surface energy coefficient and the beam energy on the dynamic feature of the fission is demonstrated. At higher beam energy, or with larger surface energy coefficient, the mass asymmetry of the fission fragments is larger and the angular distribution of the fission axis shows a more pronounced peak near beam direction, coincidentally the fission time scale is shorter. The variation suggests that the fission observables can be used as sensitive probes to the surface energy coefficient of nucleus. Irrelevant to the beam energy or the surface energy coefficient, the mean value of the relative velocity of the fission fragments situates in the vicinity of 2.4 cm/ns, in accordance with the Viola systematics applied in statistic fission. This value can be used as a calibration constant in all heavy ion fission experiments. The studies demonstrate the applicability of the transport model in the description of fast fission as a large amplitude collective motion mode in heavy ion collisions.
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DOI：
10.1016/0375-9474(84)90526-8
发表时间：
1984-06
期刊：
Nuclear Physics
影响因子：
--
作者：
Z. Zheng;B. Borderie;D. Gardès;H. Gauvin;F. Hanappe;J. Peter;M. Rivet;B. Tamain;A. Zaric
通讯作者：
Z. Zheng;B. Borderie;D. Gardès;H. Gauvin;F. Hanappe;J. Peter;M. Rivet;B. Tamain;A. Zaric
影响因子：
5
作者：
D. Florian;R. Sassot
通讯作者：
D. Florian;R. Sassot
影响因子：
3.1
作者：
Junlong Tian;Xi-zhen Wu;Zhu-xia Li;K. Zhao;Y. Zhang;Xian Li;S. Yan
通讯作者：
Junlong Tian;Xi-zhen Wu;Zhu-xia Li;K. Zhao;Y. Zhang;Xian Li;S. Yan
DOI：
10.1016/s0375-9474(00)00193-7
发表时间：
2000-08
期刊：
Nuclear Physics
影响因子：
--
作者：
F. Bocage;J. Colin;M. Louvel;G. Auger;C. Bacri;N. Bellaize;B. Borderie;R. Bougault;R. Brou;P. Buchet;J. Charvet;A. Chbihi;D. Cussol;R. Dayras;N. Cesare;A. Demeyer;D. Doré;D. Durand;J. Frankland;E. Galichet;E. Genouin-Duhamel;E. Gerlic;D. Guinet;P. Lautesse;J. Laville;J. Lecolley;R. Légrain;N. Neindre;O. Lopez;A. Maskay;L. Nalpas;A. Nguyen;M. Pârlog;J. Peter;E. Plagnol;M. Rivet;E. Rosato;F. Saint-Laurent;S. Salou;J. Steckmeyer;M. Stern;G. Tabacaru;B. Tamain;O. Tirel;L. Tassan-got;E. Vient;M. Vigilante;C. Volant;J. Wieleczko;C. Brun;A. Genoux-Lubain;G. Rudolf;L. Stuttgé
通讯作者：
F. Bocage;J. Colin;M. Louvel;G. Auger;C. Bacri;N. Bellaize;B. Borderie;R. Bougault;R. Brou;P. Buchet;J. Charvet;A. Chbihi;D. Cussol;R. Dayras;N. Cesare;A. Demeyer;D. Doré;D. Durand;J. Frankland;E. Galichet;E. Genouin-Duhamel;E. Gerlic;D. Guinet;P. Lautesse;J. Laville;J. Lecolley;R. Légrain;N. Neindre;O. Lopez;A. Maskay;L. Nalpas;A. Nguyen;M. Pârlog;J. Peter;E. Plagnol;M. Rivet;E. Rosato;F. Saint-Laurent;S. Salou;J. Steckmeyer;M. Stern;G. Tabacaru;B. Tamain;O. Tirel;L. Tassan-got;E. Vient;M. Vigilante;C. Volant;J. Wieleczko;C. Brun;A. Genoux-Lubain;G. Rudolf;L. Stuttgé
DOI：
10.1016/0375-9474(82)90084-7
发表时间：
1982-08
期刊：
Nuclear Physics
影响因子：
--
作者：
C. Grégoire;C. Ngô;B. Remaud
通讯作者：
C. Grégoire;C. Ngô;B. Remaud