Influence of entrance channel on multinucleon transfer cross sections

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Zhi Cheng ◽  
Xiao Jun Bao
Keyword(s):  
Cross Sections ◽  
Entrance Channel

Entrance Channel Dependence of Production Cross Sections of Superheavy Nuclei in Cold Fusion Reactions

2005 ◽  
Vol 22 (4) ◽  
pp. 846-849 ◽  
Author(s):  
Feng Zhao-Qing ◽  
Jin Gen-Ming ◽  
Fu Fen ◽  
Zhang Feng-Shou ◽  
Jia Fei ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Cold Fusion ◽  
Entrance Channel ◽  
Superheavy Nuclei ◽  
Fusion Reactions

CROSS SECTIONS CALCULATED FOR COLD FUSION REACTIONS WITH EMISSION OF ONLY ONE NEUTRON FOR PRODUCING THE HEAVIEST ELEMENTS

2005 ◽  
Vol 14 (03) ◽  
pp. 373-375 ◽  
Author(s):  
ROBERT SMOLAŃCZUK
Keyword(s):  
Cross Sections ◽  
Level Density ◽  
Cold Fusion ◽  
Entrance Channel ◽  
Fusion Reactions ◽  
Coupled Channels ◽  
Dynamical Deformation ◽  
Channel Effects ◽  
The Difference ◽  
Heaviest Elements

Entrance-channel effects in cold fusion reactions that lead to heavy and superheavy nuclei are discussed in the framework of the coupled-channels theory. Dynamical deformation besides collective excitations is taken into account in the entrance channel. Exit channel is described by using the modified statistical model that takes into account the difference between the level density in the equilibrium configuration and that in the saddle-point configuration. Comparison of the calculated fusion cross sections with experimental data is given.

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.

Effect of the entrance channel mass asymmetry on the limitation of light heavy-ion fusion cross sections

1990 ◽  
Vol 42 (1) ◽  
pp. 354-362 ◽  
Author(s):  
R. M. Anjos ◽  
V. Guimares ◽  
N. Added ◽  
N. Carlin Filho ◽  
M. M. Coimbra ◽  
...  
Keyword(s):  
Cross Sections ◽  
Heavy Ion ◽  
Entrance Channel ◽  
Mass Asymmetry ◽  
Heavy Ion Fusion

ENTRANCE-CHANNEL EFFECTS IN SUPPRESSION OF FUSION OF HEAVY NUCLEI

2008 ◽  
Vol 17 (01) ◽  
pp. 12-22 ◽  
Author(s):  
K. SIWEK-WILCZYŃSKA ◽  
A. BOROWIEC ◽  
I. SKWIRA-CHALOT ◽  
J. WILCZYŃSKI
Keyword(s):  
Coulomb Interaction ◽  
Interaction Parameter ◽  
Cross Sections ◽  
Entrance Channel ◽  
Hindrance Factor ◽  
Heavy Nuclei ◽  
Channel Effects ◽  
Extract Information

A set of 28 reactions of heavy and superheavy systems for which measured evaporation cross sections are available in the literature was analyzed with the aim to extract information on the fusion hindrance factor. Systematics of the deduced "experimental" hindrance factors (or in other words – fusion probabilities Pfus), based on the dependence of Pfus on the Coulomb interaction parameter [Formula: see text] and the excess of energy above the interaction barrier, E - B0, is presented.

THE NEAR-THRESHOLD PRODUCTION OF ϕ-MESONS IN PROTON–NUCLEON COLLISIONS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 317-324 ◽  
Author(s):  
◽  
M. Hartmann ◽  
Y. Maeda ◽  
I. Keshelashvili ◽  
S. Barsov ◽  
...  
Keyword(s):  
Energy Dependence ◽  
Cross Section ◽  
Cross Sections ◽  
Entrance Channel ◽  
Significant Enhancement ◽  
Total Cross Sections ◽  
Deuterium Target ◽  
The Cross ◽  
Near Threshold

The pp → ppϕ and quasi–free pn → dϕ reactions have been studied at the Cooler Synchrotron COSY–Jülich, using the internal beam and the ANKE facility. Total cross sections in the pp entrance channel have been determined at three excess energies ∊ in the range of 18.5–75.9 MeV. In case of the pn entrance channel the energy dependence of the cross section up to 80 MeV has been extracted by exploiting the intrinsic momentum of the neutron inside a deuterium target. Taken together with data for ω–production, a significant enhancement of the ϕ/ω ratio for both entrance channels of a factor 8 is found compared to predictions based on the Okubo–Zweig–Iizuka rule.

Fragment mass identification and related aspects in the decay of 40Ca* and 39K* nuclei

2014 ◽  
Vol 23 (10) ◽  
pp. 1450063 ◽  
Author(s):  
Gurvinder Kaur ◽  
Manoj K. Sharma
Keyword(s):  
Cross Sections ◽  
Entrance Channel ◽  
Cluster Decay ◽  
Channel Effects ◽  
Nice Agreement ◽  
The Cross ◽  
Fragmentation Potential ◽  
First Time ◽  
Mass Identification

The dynamics involved in the decay of light mass nuclei formed in asymmetric channels 12 C + 28 Si , 11 B + 28 Si and 12 C + 27 Al have been investigated using the dynamical cluster-decay model (DCM). In reference to the experimentally measured charge particle cross-sections, the fragment masses contributing towards the decay of 40 Ca * and 39 K * nuclei have been identified using spherical choice of fragmentation. Also, the role of entrance channel has been investigated by studying the decay of 39 K * nuclear system formed in two different reactions at same excitation energy. The behavior of fragmentation potential, preformation probability, penetrability and emission time, is analyzed to figure out the favorable mass fragments, their relative emergence and the entrance channel effects observed in the decay of light mass nuclei. In addition to this, the cross-sections for the light particles (LPs) and heavier charge fragments have been estimated for the compound nucleus (CN) decay. Besides this, one of the noncompound nucleus (nCN) process, deep inelastic collision (DIC) has been addressed in context of DCM approach for the first time. The cross-sections obtained in framework of DCM for both CN and nCN processes are found to have nice agreement with the available experimental data.

INFLUENCE OF ENTRANCE-CHANNEL SHELL EFFECTS ON FUSION HINDRANCE

2008 ◽  
Vol 17 (01) ◽  
pp. 23-30
Author(s):  
J. BŁOCKI ◽  
J. WILCZYŃSKI
Keyword(s):  
Diffusion Model ◽  
Cross Sections ◽  
Evaporation Residue ◽  
Entrance Channel ◽  
Dynamical Model ◽  
Striking Difference ◽  
Injection Point ◽  
Shell Effects ◽  
Diffusion Stage

A study is presented to what extent a striking difference in the evaporation-residue cross sections for two reactions, 86 Kr + 130 Xe and 86 Kr + 136 Xe , originates from different shell effects in 130 Xe and 136 Xe nuclei. A classical dynamical model with one-body dissipation was used to calculate the injection point to the "diffusion" stage of the Fusion-by-Diffusion model of Światecki, Siwek-Wilczyńska and Wilczyński. Only a factor of 6 in the ratio of the fusion hindrance factors in these two reactions can be associated with the entrance-channel shell effects.

Fusion of Li and C and a search for entrance channel limitations to fusion cross sections

1982 ◽  
Vol 26 (3) ◽  
pp. 981-988 ◽  
Author(s):  
L. C. Dennis ◽  
K. M. Abdo ◽  
A. D. Frawley ◽  
K. W. Kemper
Keyword(s):  
Cross Sections ◽  
Entrance Channel
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