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

Results and Discussions Outlines YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 1 Introduction Theoretical Models Results and Discussions Summary

Introduction – Heavy-ion Nuclear Reaction YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 2

Nuclear Dissipation YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 3 D. Hilscher, I.I. Gontchar and H. Rossner, Phys. Atom. Nucl. 57, 1353 (1994)

Theoretical results I YCMAO, 2012SHN, Lanzhou, 2012-08-11 — 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, 064603 (2001); ibids 63, 064603 (2001). G. Abal, et al., Nucl. Phys. A 683, 279 (2001).

Theoretical results II YCMAO, 2012SHN, Lanzhou, 2012-08-11 — 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).

Theoretical Models In overdamped condition，Langevin equation reads： YCMAO, 2012SHN, Lanzhou, 2012-08-11 — 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)

Important parameters I Entropy: Temperature: Level density parameter (LDP): YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 7

Important parameters II YCMAO, 2012SHN, Lanzhou, 2012-08-11 — 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)

Important parameters III YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 9 Coordinate Relationship of Nuclear Dissipation

Motive YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 10

MCDSM (Driving Potential) I YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 11 W. J. Swiatecki, Nucl. Phys. A 574, 233 (1994)

MCDSM (Driving Potential) II YCMAO, 2012SHN, Lanzhou, 2012-08-11 — 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)

MCDSM (LDP) LDP a (q) YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 13

Results and Disscusions YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 14 Y.C. Mao, and B.P. Gu, J. Phys.G 32, 2109 (06)

Pathwise Analysis Method I YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 15

Pathwise Analysis Method II YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 16 191,194,197,200,203Au

Pathwise Analysis Method III YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 17

Pathwise Analysis Method IV YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 18

Pathwise Analysis Method V YCMAO, 2012SHN, Lanzhou, 2012-08-11 — page 19

Summary YCMAO, 2012SHN, Lanzhou, 2012-08-11 — 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.

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