scholarly journals Entrance channel mass asymmetry dependence of compound nucleus formation

2008 ◽  
Vol 665 (4) ◽  
pp. 314-317 ◽  
Author(s):  
Bao-An Bian ◽  
Feng-Shou Zhang ◽  
Hong-Yu Zhou
Keyword(s):  
Compound Nucleus ◽  
Entrance Channel ◽  
Nucleus Formation ◽  
Mass Asymmetry ◽  
Compound Nucleus Formation

SHELL CORRECTION ENERGY AND THE ENTRANCE CHANNEL EFFECT ON THE FORMATION OF SUPERHEAVY NUCLEI

2008 ◽  
Vol 17 (supp01) ◽  
pp. 80-96 ◽  
Author(s):  
BAO-AN BIAN ◽  
FENG-SHOU ZHANG ◽  
SAI-SAI DU
Keyword(s):  
Compound Nucleus ◽  
Cross Sections ◽  
Entrance Channel ◽  
Shell Correction ◽  
Superheavy Nuclei ◽  
Nucleus Formation ◽  
Mass Asymmetry ◽  
Compound Nucleus Formation ◽  
The One ◽  
Shell Correction Energy

Based on the improved isospin dependent molecular dynamics model in which the shell correction energy of the system is calculated by using deformed two-center shell model and the surface energy of the system is improved by introducing a switch function that combines the surface energies of projectile and target with the one of the compound nucleus. The effects of the shell correction energy on synthesis of superheavy nuclei and the fusion cross sections in asymmetric and nearly symmetric reaction systems leading to the same compound nuclei 62 Zn , 76 Kr , and 202 Pb are studied. The entrance channel mass asymmetry dependence of compound nucleus formation is found by analyzing the shell correction energies, Coulomb barriers and fusion cross sections. The experimental data are described quantitatively by the present model. It is found that the compound nucleus formation is favorable for the systems with larger mass asymmetry.

Compound nucleus formation in the 14N + 16O system

1977 ◽  
Vol 38 (10) ◽  
pp. 1179-1183 ◽  
Author(s):  
C. Volant ◽  
M. Conjeaud ◽  
S. Harar ◽  
E.F. Da Silveira
Keyword(s):  
Compound Nucleus ◽  
Nucleus Formation ◽  
Compound Nucleus Formation

Quasi-compound nucleus formation with 84 MeV/N12C projectiles

1981 ◽  
Vol 303 (1) ◽  
pp. 85-86 ◽  
Author(s):  
J. Blachot ◽  
J. Cran�on ◽  
H. Nifenecker ◽  
A. Lleres ◽  
A. Gizon ◽  
...  
Keyword(s):  
Compound Nucleus ◽  
Nucleus Formation ◽  
Compound Nucleus Formation

Compound Nucleus Formation Mechanisms in Reaction of Heavy Ions with Medium-Mass Elements

1962 ◽  
Vol 127 (5) ◽  
pp. 1722-1731 ◽  
Author(s):  
Jacques B. J. Read ◽  
Inge-Maria Ladenbauer-Bellis ◽  
Richard Wolfgang
Keyword(s):  
Compound Nucleus ◽  
Heavy Ions ◽  
Formation Mechanisms ◽  
Nucleus Formation ◽  
Medium Mass ◽  
Compound Nucleus Formation

COMPOUND NUCLEUS FORMATION IN NITROGEN–OXYGEN AND OXYGEN–OXYGEN REACTIONS

1962 ◽  
Vol 40 (1) ◽  
pp. 139-149
Author(s):  
W. A. Cartledge
Keyword(s):  
Cross Section ◽  
Compound Nucleus ◽  
Center Of Mass ◽  
Branching Ratio ◽  
Nuclear Interaction ◽  
Experimental Cross Section ◽  
Interaction Radius ◽  
Nucleus Formation ◽  
Experimental Cross ◽  
Compound Nucleus Formation

The experimental cross section for the reaction O16(N14,2p)Al28 is compared with the predictions of the square-well model of compound nucleus formation over the range 6.3 to 12 Mev (center of mass energy). The branching ratio is estimated from the experimental cross section for the comparison reaction Si29(p,2p)Al28 over the same range of excitation in the compound nucleus P30*. It is found that the branching ratio probably increases from about 10% to 20%, which requires the nuclear interaction radius for N14 + O16 to decrease from about 8.5 to 7.5 fermis as the energy is increased over this range.Because of the similarity in mass and observed charge distributions in N14 and O16, the interaction radius for compound nucleus formation in a collision between two oxygen nuclei is probably also similar and in the range 8.0 to 9.1 fermis at energies far below the Coulomb barrier. A consequence of this result is that oxygen ions, which may be present in the cores of sufficiently developed red giant stars, will be destroyed by O16 + O16 collisions in about 105 years and 1 year respectively, at temperatures in the vicinity of 13.0 and 18.5 × 108 °K.

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