Fluctuation-dissipation model for synthesis of superheavy elements

被引：153

作者：

Aritomo, Y ^{[1
]}

Wada, T

Ohta, M

Abe, Y

机构：

[1] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan

[2] Kyoto Univ, YITP, Kyoto 6068501, Japan

来源：

PHYSICAL REVIEW C | 1999年 / 59卷 / 02期

关键词：

D O I：

10.1103/PhysRevC.59.796

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：

Fusion-fission dynamics in superheavy elements is investigated by an approximate fluctuation-dissipation model, i.e., a diffusion model in the deformation space, assuming that the kinetic energy of the incident ion dissipates immediately after the contact. The probability accumulated inside the fission barrier is calculated by the one-dimensional Smoluchowski equation taking account of the temperature dependence of the shell correction energy. A new mechanism for an optimum condition is found as a compromise of two conflicting requirements: higher incident energy for larger fusion probability and lower excitation energy of compound nuclei for larger survival probability. Enhancements of the residue cross sections at the optimum condition are obtained for the cases in which the cooling is quick to restore the shell correction energy, combined with slow fissioning motion due to the strong friction. With symmetric combinations of incident ions, the (HI, 3-4n) channels show the enhancement. [S0556-2813(99)01501-0].

引用

页码：796 / 809

页数：14

共 63 条

[1] A new mechanism for synthesis of superheavy elements [J].

Abe, Y ;

Aritomo, Y ;

Wada, T ;

Ohta, M .

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 1997, 23 (10) :1275-1284

[2] On stochastic approaches of nuclear dynamics [J].

Abe, Y ;

Ayik, S ;

Reinhard, PG ;

Suraud, E .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1996, 275 (2-3) :49-196

[3] THERMAL FLUCTUATIONS IN HEAVY-ION FUSION REACTIONS .2. MULTIDIMENSIONAL MODELS [J].

AGUIAR, CE ;

BARBOSA, VC ;

DONANGELO, R .

NUCLEAR PHYSICS A, 1990, 517 (01) :205-220

[4] THERMAL FLUCTUATIONS IN HEAVY-ION FUSION REACTIONS .1. ONE-DIMENSIONAL MODELS [J].

AGUIAR, CE ;

BARBOSA, VC ;

DONANGELO, R ;

SOUZA, SR .

NUCLEAR PHYSICS A, 1989, 491 (02) :301-313

[5] CROSS-SECTIONS OF 102 ELEMENT ISOTOPES FORMATION IN THE REACTIONS OF NE-22+U-236 AND MG-26+TH-232 [J].

ANDREYEV, AN ;

BOGDANOV, DD ;

CHEPIGIN, VI ;

KABACHENKO, AP ;

MALYSHEV, ON ;

SAGAIDAK, RN ;

SALAMATIN, LI ;

TERAKOPIAN, GM ;

YEREMIN, AV .

ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 1993, 345 (04) :389-394

[6] Diffusion mechanism for synthesis of superheavy elements [J].

Aritomo, Y ;

Wada, T ;

Ohta, M ;

Abe, Y .

PHYSICAL REVIEW C, 1997, 55 (03) :R1011-R1014

[7] Diffusion model for the synthesis of superheavy elements [J].

Aritomo, Y ;

Okazaki, K ;

Wada, T ;

Ohta, M ;

Abe, Y .

TOURS SYMPOSIUM ON NUCLEAR PHYSICS III, 1998, (425) :61-71

[8]

ARMBRUSTER P, 1985, ANNU REV NUCL PART S, V35, P135

[9]

Bass R., 1980, Nuclear Reactions with Heavy Ions

[10] DYNAMICAL ASPECTS OF NUCLEUS-NUCLEUS COLLISIONS [J].

BJORNHOLM, S ;

SWIATECKI, WJ .

NUCLEAR PHYSICS A, 1982, 391 (02) :471-504

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