Coupling constants of commonly used nuclear probes

Dzhazairov-Kakhramanov

2017

Int. J. Mod. Phys. E

Abstract:We have studied the neutron-capture reactions 8 Li(n,) 9 Li and its role in the primordial nucleosynthesis. The n+ 8 Li 9 Li+ reaction has a significant astrophysical interest, because it includes into one of the variants of chain of primordial nucleosynthesis processes of the Universe and thermonuclear reactions in type II supernovae. Furthermore, we consider the 9 Be(p,) 10 B reaction in the astrophysical energy range in the modified potential cluster model with splitting of orbital states according to Young tableaux and, in some cases, with forbidden states. The reaction 9 Be(p,) 10 B plays an important role in primordial and stellar nucleosynthesis of light elements in the p shell. Hydrogen burning in secondgeneration stars occurs via the proton-proton (pp) chain and CNO cycle, with the 9 Be(p,) 10 B reaction serving as an intermediate link between these cycles. Furthermore, the possibility of describing available experimental data for the total reaction cross sections of neutron radiative capture on 10 Be at thermal and astrophysical energies has been shown. This reaction is a part of one of the variants of the chain of primordial nucleosynthesis of the Universe due to which the elements with a mass of A > 11-12 may be formed. The results in the field of study of thermonuclear proton capture reaction on 10 B at ultralow, i.e., astrophysical energies will be presented further. The possibility of description of the experimental data for the astrophysical S-factor of the proton radiative capture on 16 O to the ground state of Keywords: Nuclear astrophysics; primordial nucleosynthesis; light atomic nuclei; low and astrophysical energies; radiative capture; total cross section; thermonuclear processes; potential cluster model; forbidden states. 21.60.Gx, 25.20.Lj, 25.40.Lw, 26.20.Np, 26.35.+c, 26.50.+x, 26.90.+n PACS Number(s): IntroductionThis review is the logical continuation of our works devoted to the radiative proton and neutron capture on light nuclei that were published in Int. J. Mod. Phys. E 21, 1250039 (2012); 22, 1350028 (2013); 22, 1350075 (2013); 23, 1430012 (2014). Astrophysical aspects of the reviewAs we know, light radioactive nuclei play an important role in many astrophysical environments. In addition, such parameter as cross section of the capture reactions as 2 a function of energy and reaction rates are very important for investigation of many astrophysical problems such as primordial nucleosynthesis of the Universe, main trends of stellar evolution, novae and super-novae explosions, X-ray bursts etc. The continued interest in the study of processes of radiative neutron capture on light nuclei at thermal (> 10 meV) and astrophysical (> 1 keV) energies is caused by several reasons. Firstly, this process plays a significant part in the study of many fundamental properties of nuclear reactions, and secondly, the data on the capture cross sections are widely used in a various applications of nuclear physics and nuclear astrophysics, for example, in the process of studying of...

Section: Model and Calculation Methodsmentioning

confidence: 99%

“…where C is the asymptotic constant in fm -1/2 , which is related to the dimensionless AC C W , 59 used by us in the following way:…”

Section:  mentioning

confidence: 99%

See 1 more Smart Citation

Study of the nucleon radiative captures 8Li(n,γ)9Li, 9Be(p,γ)10B, 10Be(n,γ)11Be, 10B(p,γ)11C, and 16O(p,γ)17F at thermal and astrophysical energies

Dzhazairov-Kakhramanov

2017

Int. J. Mod. Phys. E

“…where S is the spectroscopic factor; C is the asymptotic constant in fm -1/2 , which join with the dimensionless AC [41] C W , using by us further in the next way:…”

Section: Asymptotic Constantsmentioning

confidence: 99%

Radiative p 16O Capture at Astrophyiscal Energies

2016

Russ Phys J

:The possibility of description of the experimental data for the astrophysical S-factor of the proton radiative capture on 16 O to the ground and first excited states of 17 F was considered in the frame of the modified potential cluster model with forbidden states and classification of the states according to Young tableaux. It was shown that on the basis of the E1 transitions from the P states of p 16 O scattering to the bound states of 17 F in the p 16 O channel, it generally succeed to explain the value of measured astrophysical S-factors and reaction rates at astrophysical energies.

“…As a result the following parameters for the potential of 16 The potential leads to the binding energy -2.49100003 MeV at the finite-difference method accuracy 10 -8 MeV, the root mean square radius 2.63 Fm and mass radius 2.76 Fm. For the AC defined in work [35] and written in the nondimensional form…”

Section: Interaction Potentialsmentioning

confidence: 99%

Neutron capture by light nuclei at astrophysical energies

2013

Phys. Part. Nuclei

Abstract.Within the potential cluster model with the forbidden states and an orbital states classification according to the Young diagrams the possibility of description of experimental data for the total cross-sections of radiative n 15 N-capture at energies from 25 to 370 keV was considered. It was shown that only on basis of the E1-transitions from the different states of n 15 N-scattering to the ground state of 16 N nucleus in n 15 N-channel it is well succeed to explain the value of the total cross-sections in the considered energy range and to prognosticate its behavior at energy E  1 eV. These cross-sections at energies E  10 keV are approximated by the simple analytical form.