核耗散降低了裂变截面值(σdropf )。基于Langevin模型，研究了角动量对σdropf 作为鞍点前摩擦强度β函数的影响。发现在低自旋，摩擦对σdropf 的影响显著增强。通过考察系统195Bi，201Bi 和207Bi的σdropf 随β的演化，发现摩擦效应随着Bi核中质比(N/Z )的增加而变大。这些结果建议，为了更好地在实验上用裂变截面探测β，应产生那些具有低自旋、高N/Z的热核系统。
Using the Langevin model, we study the effect of angular momentum on the drop of fission cross sections caused by friction over its standard statistical-model value,σdropf , as a function of presaddle friction strength β. It is found that friction effects on σdropf are substantially enhanced at low spin. In addition, by investigating the evolution of σdropf with β for 195Bi, 201Bi and 207Bi nuclei, we find that friction effects become greater with increasing the neutron-to-proton ratio (N/Z) of Bi nucleus. These results suggest that on the experimental side, to precisely probe presaddle dissipation by measuring fission excitation functions, it is best to yield excited nuclear systems with a small spin and a large N/Z.
参考文献
| [1] | JACQUET D;MORJEAN M.[J].Prog Part Nucl Phys,200963:155. |
| [2] | FELDMEIER H.[J].Rep Prog Phys,198750:915. |
| [3] | HILSCHER D;ROSSNER H.[J].Ann Phys(Paris),199217:471. |
| [4] | SANDAL R;BEHERA B R;SINGH V.[J].Phys Rev C,201387:014604. |
| [5] | HINDE D J;HILSCHER D;ROSSNER H.[J].Phys Rev C,199245:1229. |
| [6] | BACK B B;BLUMENTHAL D J;DAVIDS C N.[J].Phys Rev C,199960:044602. |
| [7] | SHIDLING P D;MADHAVAN N;RAMAMURTHY V S.[J].Phys Rev C,200674:064603. |
| [8] | RAMACHANDRAN K;CHATTERJEE A;NAVIN A.[J].Phys Rev C,200673:064609. |
| [9] | LESTONE J P;MCCALLA S G.[J].Phys Rev C,200979:044611. |
| [10] | SINGH H;BEHERA B R;SINGH G.[J].Phys Rev C,200980:064615. |
| [11] | MANCUSI D;CHARITY R J;CUGNON J.[J].Phys Rev C,201082:044610. |
| [12] | FABRIS D;VIESTI G;FIORETTO E.[J].Phys Rev Lett,199473:2676. |
| [13] | FR ¨OBRICH P.[J].Prog Theor Phys Suppl,2004154:279. |
| [14] | WADA T;ABE Y;CARJAN N.[J].Phys Rev Lett,199370:3538. |
| [15] | POMORSKI K;NERLO-POMORSKA B;SUROWIEC A.[J].Nucl Phys A,2000679:25. |
| [16] | NADTOCHY P N;ADEEV G D;KARPOV A V.[J].Phys Rev C,200265:064615. |
| [17] | YE W;YANG H W;WU F.[J].Phys Rev C,200877:011302. |
| [18] | YE W.[J].Phys Lett B,2009681:413. |
| [19] | SADHUKHAN J;PAL S.[J].Phys Rev C,200878:011603(R). |
| [20] | MIRFATHI S M;PAHLAVANI M R.[J].Phys Rev C,200878:064612. |
| [21] | WANG N;YE W.[J].Phys Rev C,201378:051601(R). |
| [22] | FR ¨OBRICH P;GONTCHAR I I.[J].Phys Rep,1998292:131. |
| [23] | FR ¨OBRICH P.[J].Nucl Phys A,2007787:170c. |
| [24] | SIERK A J.[J].Phys Rev C,198633:2039. |
| [25] | M ¨OLLERP;MY-ERS W D;SWIATECKI W J.[J].At Data & Nucl Data Tables,198839:225. |
| [26] | IGNATYUK A V;ITKIS M G;OKOLOVICH V N.[J].Sov J Nucl Phys,197521:612. |
| [27] | GONTCHAR I I;FR ¨OBRICH P;PISCHASOV N I.[J].Phys Rev C,199347:2228. |
| [28] | BLANN M.[J].Phys Rev C,198021:1770. |
| [29] | LAZAREV YU A;GONTCHAR I I;MAVLITOV N D.[J].Phys Rev Lett,199370:1220. |
| [30] | SCHMITT C;SCHMIDT K H;KELI ′CA.[J].Phys Rev C,201081:064602. |
| [31] | JURADO B;SCHMITT C;SCHMIDT K H.[J].Phys Rev Lett,200493:072501. |
| [32] | BENLLIURE J;CASAREJOS E;PEREIRA J.[J].Phys Rev C,200674:014609. |
| [33] | LOTT B;GOLDENBAUM F;BOHM A.[J].Phys Rev C,200163:034616. |
| [34] | JAHNKE U;BOHNE W;EGIDY T.[J].Phys Rev Lett,199983:4959. |
| [35] | YE W.[J].Phys Rev C,201285:011601(R). |
| [36] | YE W.[J].Phys Rev C,200980:011601(R). |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%