scholarly journals Analysis of 9Be fusion cross sections via a simple cluster model

2021 ◽  
Author(s):  
Murat AYGUN
Keyword(s):  
Cross Sections ◽  
Cluster Model

Reaction rate of n12C radiative capture at temperature from 0.01 to 10 T9

2021 ◽  
pp. 142-148
Author(s):  
S.B. Dubovichenko ◽  
◽  
N.A. Burkova ◽  
R.R. Shamitova ◽  
◽  
...  
Keyword(s):  
Cross Sections ◽  
Cluster Model ◽  
Bound States ◽  
Reaction Rate ◽  
Applied Research ◽  
Radiative Capture ◽  
Potential Cluster Model ◽  
Total Cross Sections ◽  
Forbidden States ◽  
Wide Resonance

Within the framework of a modified potential cluster model with forbidden states, radiation n12C capture at energies from 10-5 keV to 5 MeV is considered, taking into account a wide resonance at Ex = 8.2 MeV. It is shown that on the basis of potentials that are consistent with the energies of the bound states, it is possible to correctly transfer the available experimental data. Based on the obtained total cross sections, the n12C capture reaction rate was calculated. The results for reaction rate are approximated by simple expressions, which simplifies their use in applied research.

scholarly journals Elastic scattering and breakup reactions with light proton- and neutron-rich exotic nuclei

2018 ◽  
Vol 194 ◽  
pp. 07002
Author(s):  
M.K. Gaidarov ◽  
V.K. Lukyanov ◽  
D.N. Kadrev ◽  
E.V. Zemlyanaya ◽  
A.N. Antonov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Cross Sections ◽  
Cluster Model ◽  
Microscopic Analysis ◽  
High Energy ◽  
The Real ◽  
Optical Potentials ◽  
Generator Coordinate ◽  
Energy Approximation

A microscopic analysis of the optical potentials (OPs) and cross sections of elastic scattering of 8B on 12C, 58Ni, and 208Pb targets at energies 20 < E < 170 MeV and 12,14Be on 12C at 56 MeV/nucleon is carried out. The real part of the OP is calculated by a folding procedure and the imaginary part is obtained on the base of the high-energy approximation (HEA). The density distributions of 8B evaluated within the variational Monte Carlo (VMC) model and the three-cluster model (3CM) are used to construct the potentials. The 14Be densities obtained in the framework of the the generator coordinate method (GCM) are used to calculate the optical potentials, while for the same purpose both the VMC model and GCM densities of 12Be are used. In the hybrid model developed and explored in our previous works, the only free parameters are the depths of the real and imaginary parts of OP obtained by fitting the experimental data. The use of HEA to estimate the imaginary OP at energies just above the Coulomb barrier is discussed. In addition, cluster model, in which 8B consists of a p-halo and the 7Be core, is applied to calculate the breakup cross sections of 8B nucleus on 9Be, 12C, and 197Au targets, as well as momentum distributions of 7Be fragments. A good agreement of the theoretical results with the available experimental data is obtained. It is concluded that the reaction studies performed in this work may provide supplemental information on the internal spatial structure of the proton- and neutron-halo nuclei.

ELASTIC SCATTERING OF DEUTERONS ON α-CLUSTER NUCLEI

1995 ◽  
Vol 10 (38) ◽  
pp. 2915-2921 ◽  
Author(s):  
V.P. MIKHAILYUK
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Scattering Theory ◽  
Cluster Model ◽  
Differential Cross Sections ◽  
Diffraction Scattering ◽  
Multiple Diffraction

The differential cross-sections for elastic scattering of deuterons on 12 C and 16 O nuclei at 700 MeV are calculated on the basis of multiple diffraction scattering theory and the α-cluster model with dispersion. For d−12 C scattering it was shown that the results of the calculations by the model, when the effects related with the deuteron structure included via deuteron-α amplitude are in better agreement with the experimental data than those by the model, in which incident deuteron is considered as composed of neutron and proton.

STAU-CATALYZED BIG-BANG NUCLEOSYNTHESIS AND NUCLEAR CLUSTER MODEL

2009 ◽  
Vol 24 (11) ◽  
pp. 2076-2083 ◽  
Author(s):  
M. KAMIMURA ◽  
Y. KINO ◽  
E. HIYAMA
Keyword(s):  
Cross Sections ◽  
Cluster Model ◽  
Nuclear Reactions ◽  
Light Element ◽  
Bound State ◽  
Big Bang ◽  
Reaction Cross ◽  
Big Bang Nucleosynthesis ◽  
Model Calculations ◽  
Three Body

Three-body cluster-model calculations are performed for the new types of big-bang nucleosynthesis (BBN) reactions that are calalyzed by a supersymmetric (SUSY) particle stau, a scalar partner of the tau lepton. If a stau has a lifetime ≳ 103s, it would capture a light element previously synthesized in standard BBN and form a Coulombic bound state. The bound state, an exotic atom, is expected to induce various reactions, such as (αX-) + d → 6 Li + X-, in which a negatively charged stau (denoted as X-) works as a catalyzer. Recent literature papers have claimed that some of these stau-catalyzed reactions have significantly large cross sections so that inclusion of the reactions into the BBN network calculation can change drastically abundances of some elements, giving not only a solution to the 6 Li -7 Li problem (calculated underproduction of 6 Li by ~ 1000 times and overproduction of 7 Li +7 Be by ~ 3 times) but also a constraint on the lifetime and the primordial abundance of the elementary particle stau. However, most of these literature calculations of the reaction cross sections were made assuming too naive models or approximations that are unsuitable for those complicated low-energy nuclear reactions. We use a few-body calculational method developed by the authors, and provides precise cross sections and rates of the stau-catalyzed BBN reactions for the use in the BBN network calculation.

ELASTIC SCATTERING OF INTERMEDIATE ENERGY PARTICLES ON 20Ne NUCLEI

1999 ◽  
Vol 08 (05) ◽  
pp. 485-492 ◽  
Author(s):  
YU. A. BEREZHNOY ◽  
V. P. MIKHAILYUK
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Scattering Theory ◽  
Cluster Model ◽  
Cluster Structure ◽  
Intermediate Energy ◽  
Proton Scattering ◽  
Diffraction Scattering ◽  
Multiple Diffraction

The differential cross-sections and polarization observables of 800 MeV proton and 1.37 GeV α-particle elastic scattering on 20 Ne nuclei are calculated on the basis of multiple diffraction scattering theory and α-cluster model with dispersion. It is shown that α-cluster structure is strongly manifested in 20 Ne nuclei and the assumption about that allows us to agree with the calculated and measured observables in the elastic 800 MeV proton scattering on these nuclei.

scholarly journals Radiative n11B capture accounting 21 and 430 keV resonances

2014 ◽  
Vol 29 (07) ◽  
pp. 1450036 ◽  
Author(s):  
S. B. Dubovichenko ◽  
N. A. Burkova
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Cluster Model ◽  
Radiative Capture ◽  
Potential Cluster Model ◽  
Total Cross Sections

In the framework of the modified potential cluster model (PCM), the possibility of describing the available experimental data for the total cross-sections for n11 B radiative capture at thermal and astrophysical energies were considered with taking into account the 21 keV and 430 keV resonances.

ELASTIC 12C–12C SCATTERING AT INTERMEDIATE ENERGIES

2002 ◽  
Vol 11 (04) ◽  
pp. 281-287 ◽  
Author(s):  
YU. A. BEREZHNOY ◽  
V. P. MIKHAILYUK
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Scattering Theory ◽  
Cluster Model ◽  
Differential Cross Sections ◽  
Diffraction Scattering ◽  
Multiple Diffraction ◽  
Intermediate Energies

The differential cross-sections for elastic 12C–12C scattering at 2400 and 1449 MeV are calculated on the basis of the multiple diffraction scattering theory and α-cluster model with dispersion. At the energy 2400 MeV the calculations were performed by means of "effective" and "free" α–α amplitudes. It is shown that the results obtained differ significantly.

scholarly journals CLUSTER MODEL FOR REACTIONS INDUCED BY WEAKLY BOUND AND/OR EXOTIC HALO NUCLEI WITH MEDIUM-MASS TARGETS

2011 ◽  
Vol 20 (04) ◽  
pp. 943-946 ◽  
Author(s):  
C. BECK ◽  
N. ROWLEY ◽  
P. PAPKA ◽  
S. COURTIN ◽  
M. ROUSSEAU ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Cluster Model ◽  
Reaction Cross ◽  
Halo Nuclei ◽  
Weakly Bound ◽  
Medium Mass ◽  
Transfer Channels ◽  
Reaction Cross Sections ◽  
Existing Data

An experimental overview of reactions induced by the stable, but weakly-bound nuclei 6 Li , 7 Li and 9 Be , and by the exotic, halo nuclei 6 He , 8 B , 11 Be and 17 F on medium-mass targets, such as 58 Ni , 59 Co or 64 Zn , is presented. Existing data on elastic scattering, total reaction cross sections, fusion, breakup and transfer channels are discussed in the framework of a CDCC approach taking into account the breakup degree of freedom.

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