Statistical model of heavy-ion fusion-fission reactions

被引：138

作者：

Lestone, J. P. ^{[1
]}

McCalla, S. G. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Div Appl Phys, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW C | 2009年 / 79卷 / 04期

关键词：

CHARGED-PARTICLE MULTIPLICITIES; LEVEL-DENSITY; NEUTRON EMISSION; ANGULAR-MOMENTUM; TEMPERATURE-DEPENDENCE; FRAGMENT ANISOTROPIES; EXCITATION-FUNCTIONS; NUCLEAR-FISSION; WALL FORMULA; BARRIER;

D O I：

10.1103/PhysRevC.79.044611

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Cross-section and neutron-emission data from heavy-ion fusion-fission reactions are consistent with the fission of fully equilibrated systems with fission lifetime estimates obtained via a Kramers-modified statistical model that takes into account the classical collective motion of the system about the ground state, the temperature dependence of the location and height of fission transition points, and the orientation degree of freedom. If the "standard" techniques for calculating fission lifetimes are used, then the calculated excitation-energy dependence of fission lifetimes is incorrect. We see no evidence to suggest that the nuclear viscosity has a temperature dependence. The strong increase in the nuclear viscosity above a temperature of similar to 1.3 MeV deduced by others is an artifact generated by an inadequate fission model.

引用

页数：24

共 85 条

[1] NUCLEAR FRICTION AND LIFETIME OF INDUCED FISSION [J].

BHATT, KH ;

GRANGE, P ;

HILLER, B .

PHYSICAL REVIEW C, 1986, 33 (03) :954-968

[2]

BLANN M, 1982, 19390 UCID LAWR LIV

[3]

Blann M., 1982, 19614 UCID LAWR LIV

[4]

Bohr A., 1975, NUCL STRUCTURE, VII

[5]

Bohr A., 1969, Nuclear Structure

[6] The mechanism of nuclear fission [J].

Bohr, N ;

Wheeler, JA .

PHYSICAL REVIEW, 1939, 56 (05) :426-450

[7] NUCLEAR-FISSION WITH A LANGEVIN EQUATION [J].

BOILLEY, D ;

SURAUD, E ;

ABE, Y ;

AYIK, S .

NUCLEAR PHYSICS A, 1993, 556 (01) :67-87

[8] RESIDUE EXCITATION-FUNCTIONS FROM COMPLETE FUSION OF O-16 WITH AU-197 AND PB-208 [J].

BRINKMANN, KT ;

CARALEY, AL ;

FINEMAN, BJ ;

GAN, N ;

KELKOVSKA, J ;

MCGRATH, RL .

PHYSICAL REVIEW C, 1994, 50 (01) :309-316

[9] TEMPERATURE-DEPENDENCE OF NUCLEAR-SURFACE PROPERTIES [J].

CAMPI, X ;

STRINGARI, S .

ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 1983, 309 (03) :239-242

[10] Investigation of the level density parameter using evaporative α-particle spectra from the 19F+181Ta reaction -: art. no. 054612 [J].

Caraley, AL ;

Henry, BP ;

Lestone, JP ;

Vandenbosch, R .

PHYSICAL REVIEW C, 2000, 62 (05) :10

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