1. 基于热核退激的路径分析
对核耗散的研究
毛英臣
辽宁师范大学物理学院
2012超重核合成与性质讨论会, 兰州大学, 2012年8月

2. Results and Discussions
Outlines
YCMAO, 2012SHN, Lanzhou, — page 1
Introduction
Theoretical Models
Results and Discussions
Summary

3. Introduction – Heavy-ion Nuclear Reaction
YCMAO, 2012SHN, Lanzhou, — page 2

4. Nuclear Dissipation
YCMAO, 2012SHN, Lanzhou, — page 3
D. Hilscher, I.I. Gontchar and H. Rossner, Phys. Atom. Nucl. 57, 1353 (1994)

5. Theoretical results I
YCMAO, 2012SHN, Lanzhou, — page 4
One-Body Dissipation Theory + Wall and Window Formulism
J. Blocki et al.
J. Blocki, et al., Ann. Phys. 113, 330 (1978); H. Feldmeier, Rep. Prog. Phys. 50, 915 (1987)
J. R. Nix and A. J. Sierk, Proc. Of the 6th Adriatic Conference in Nuclure Physics: Frontiers of Heavy-Ion Physics, Dubrovnik, Yugoslavia (1987), edited by N. Cindro et al. (Singapore, World Scientific, 1990), p. 333.
S. Pal et al. Phys. Rev. C 63, (2001); ibids 63, (2001).
G. Abal, et al., Nucl. Phys. A 683, 279 (2001).

6. Theoretical results II
YCMAO, 2012SHN, Lanzhou, — page 5
Quantal Transport Theory by H. Hofmann et al.
H. Hofmann and P. J. Siemens, Nucl. Phys. A 257, 165 (1976);
H. Hofmann, Phys. Rep. 284, 137 (1997) ;
H. Hofmann, The physics of warm nuclei: with analogies to mesoscopic systems, Oxford, OUP, 2008
Dissipative Diabatic Dynamics by W. Nörenberg
W. Nörenberg, Nucl. Phys. A 409, 191c (1983).

7. Theoretical Models In overdamped condition，Langevin equation reads：
YCMAO, 2012SHN, Lanzhou, — page 6
The Combined Dynamical Statistical Model (CDSM model)
P. Fröbrich and I. I. Gontchar, Phys. Rep. 292, 131 (1998).
In overdamped condition，Langevin equation reads：
P. Fröbrich, Nucl. Phys. A 787, 107c (2007)

8. Important parameters I
Entropy:
Temperature:
Level density parameter (LDP):
YCMAO, 2012SHN, Lanzhou, — page 7

9. Important parameters II
YCMAO, 2012SHN, Lanzhou, — page 8
OBD nuclear dissipation parameter：
N. Carjan
I.I. Gontchar, L.A. Litnevsky, Z. Phys. A 359, 149 (1997)
SPS nuclear dissipation parameter：
P. Fröbrich, I.I. Gontchar, N.D. Litnevsky, N. Phys. A 556, 281 (1993)

10. Important parameters III
YCMAO, 2012SHN, Lanzhou, — page 9
Coordinate Relationship of Nuclear Dissipation

11. Motive
YCMAO, 2012SHN, Lanzhou, — page 10

12. MCDSM (Driving Potential) I
YCMAO, 2012SHN, Lanzhou, — page 11
W. J. Swiatecki, Nucl. Phys. A 574, 233 (1994)

13. MCDSM (Driving Potential) II
YCMAO, 2012SHN, Lanzhou, — page 12
The Modified Combined Dynamical Statistical Model (MCDSM model)
Potential V (q)
R.W. Hasse, Ann. Phys. 68, 377 (1971)
Y.C. Mao, and B.P. Gu, J. Phys.G 32, 2109 (06)

14. MCDSM (LDP)
LDP a (q)
YCMAO, 2012SHN, Lanzhou, — page 13

15. Results and Disscusions
YCMAO, 2012SHN, Lanzhou, — page 14
Y.C. Mao, and B.P. Gu, J. Phys.G 32, 2109 (06)

16. Pathwise Analysis Method I
YCMAO, 2012SHN, Lanzhou, — page 15

17. Pathwise Analysis Method II
YCMAO, 2012SHN, Lanzhou, — page 16
191,194,197,200,203Au

18. Pathwise Analysis Method III
YCMAO, 2012SHN, Lanzhou, — page 17

19. Pathwise Analysis Method IV
YCMAO, 2012SHN, Lanzhou, — page 18

20. Pathwise Analysis Method V
YCMAO, 2012SHN, Lanzhou, — page 19

21. Summary
YCMAO, 2012SHN, Lanzhou, — page 20
The emission of prescission paritcle decends with increasing coordinate relationship of LDP. In order to ascertain the deformation and temperature relationship of nuclear dissipation, it is necessary to take other parameters into account in the synchronizing and self-consistent way.
The emission of prescission paritcle is controled by the competition between the driving force (from the free energy)
and the nuclear damping force (nuclear dissipation) in local deformation section.

22. Thank You!