Possible Mechanisms of Ternary Fission in the ^197Au＋^197Au System at 15 A MeV  

作　　者：田俊龙 李贤 吴锡真 李祝霞 晏世伟 

机构地区：[1]College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 [2]China Institute of Atomic Energy, Beijing 102413 [3]Institute of Theoretical Physics, Chinese Academic of Sciences, Beijing 100190

出　　处：《Chinese Physics Letters》2009年第6期95-98,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10875031 and 10675172, and the Ministry of Personnel under Grant No MOP2006138 and the Ministry of Education of China under Grant No MOE2005383, and the National Basic Research Program under Grant No 2007CB209900.

摘　　要：Ternary fission in ^197Au＋^197Au collisions at 15 A MeV is investigated by using the improved quantum molecular dynamical （ImQMD） model. The experimental mass distributions for each of the three fragments are reproduced for the first time without any freely adjusting parameters. The mechanisms of ternary fission in central and semicentral collisions are dynamically studied. In direct prolate ternary fission, two necks are found to be formed almost simultaneously and rupture sequentially in a very short time interval. Direct oblate ternary fission is a very rare fission event, in which three necks are formed and rupture simultaneously, forming three equally sized fragments along space-symmetric directions in the reaction plane. In sequential ternary fission a binary division is followed by another binary fission event after hundreds of fm/c.Ternary fission in ^197Au＋^197Au collisions at 15 A MeV is investigated by using the improved quantum molecular dynamical （ImQMD） model. The experimental mass distributions for each of the three fragments are reproduced for the first time without any freely adjusting parameters. The mechanisms of ternary fission in central and semicentral collisions are dynamically studied. In direct prolate ternary fission, two necks are found to be formed almost simultaneously and rupture sequentially in a very short time interval. Direct oblate ternary fission is a very rare fission event, in which three necks are formed and rupture simultaneously, forming three equally sized fragments along space-symmetric directions in the reaction plane. In sequential ternary fission a binary division is followed by another binary fission event after hundreds of fm/c.

分 类 号：O571.43[理学—粒子物理与原子核物理] S66[理学—物理]