TRITON BREAKUP AND FORMATION AT VERY LOW ENERGIES

2012 ◽  
Vol 21 (09) ◽  
pp. 1230008 ◽  
Author(s):  
H. SADEGHI
Keyword(s):  
Radiative Capture ◽  
Theoretical Models ◽  
Effective Field ◽  
Meson Exchange ◽  
Momentum Dependence ◽  
Nucleon Force ◽  
Capture Process ◽  
Low Energies ◽  
Nucleon Interactions ◽  
Three Body

Different theoretical models for two- and three-body electromagnetic currents are constructed using meson-exchange mechanisms and minimal substitution in the momentum dependence of two- and three-nucleon interactions. We review the use of effective field theory (EFT) to compute electromagnetic reactions in three-nucleon systems at very low energies. We first explain how EFT theory can be extended to incorporate the photon into the three-nucleon systems when also a three-nucleon force is acting. We also explain the predictions of the resulting EFT for neutron–deuteron radiative capture process at very low energies. In this work, a number of low-energy photonuclear observables, including neutron–deuteron radiative capture reactions and triton photodisintegration, are calculated in order to make a comparative study of the pion-less EFT results with the models based on the realistic Argonne v18(AV18) two-nucleon and Urbana IX or Tucson–Melbourne three-nucleon interactions. The calculated cross-section of neutron–deuteron radiative capture and photon polarization parameter of 3 H are in satisfactory agreement with the available experimental data.

scholarly journals Three-body systems in physics of cold atoms and halo nuclei

2016 ◽  
Vol 25 (05) ◽  
pp. 1641003 ◽  
Author(s):  
Chen Ji
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Cold Atoms ◽  
Effective Field ◽  
Low Energy ◽  
Halo Nuclei ◽  
Particle Interactions ◽  
Body Contact ◽  
Low Energies ◽  
Three Body

Few-body systems, such as cold atoms and halo nuclei, share universal features at low energies, which are insensitive to the underlying inter-particle interactions at short ranges. These low-energy properties can be investigated in the framework of effective field theory with two-body and three-body contact interactions. I review the effective-field-theory studies of universal physics in three-body systems, focusing on the application in cold atoms and halo nuclei.

scholarly journals The neutron within the deuteron as a surrogate for neutron-induced reactions

2019 ◽  
Vol 28 (12) ◽  
pp. 1950109 ◽  
Author(s):  
C. A. Bertulani ◽  
L. F. Canto ◽  
M. S. Hussein ◽  
Shubhchintak ◽  
T. V. Nhan Hao
Keyword(s):  
Momentum Distribution ◽  
Neutron Capture ◽  
Theoretical Models ◽  
Nucleon Nucleon ◽  
Nucl Phys ◽  
Incomplete Fusion ◽  
Radioactive Beams ◽  
Nucleon Force ◽  
Capture Process ◽  
C 32

We propose the use of neutron poisons in reactions induced by radioactive beams as a test of theoretical models aiming to relate neutron capture in nuclei with neutron surrogate reactions such as ([Formula: see text]) reactions. We exploit the approximations necessary to obtain a direct relation between the two reactions: surrogate versus neutron capture. We also show how this is intimately related to the momentum distribution of the neutron within the deuteron. The models we use are based on the theory of inclusive breakup reactions commonly employed in the treatment of incomplete fusion and surrogate method. Such theories were developed in the 1980s by Ichimura, Austern and Vincent [Phys. Rev. C 32 (1985) 431], Udagawa and Tamura [Phys. Rev. C 24 (1981) 1348] and Hussein and McVoy [Nucl. Phys. A 445 (1985) 124]. We use these theories to derive an expression for the proton yield in the reaction [Formula: see text]. The capture reaction [Formula: see text] is then extracted using reasonable approximations. By recalling an old method proposed by Serber [Phys. Rev. 80 (1950) 1098; Proc. Roy. Soc. A 208 (1951) 559] we explain how the momentum distribution of neutrons within the deuteron will depend on the short-range dependence of the nucleon–nucleon force. The relevance of our work to nucleosynthesis in the rapid neutron capture process is emphasized.

d−α Radiative capture process by effective field theory

New Astronomy ◽  
2020 ◽  
Vol 80 ◽  
pp. 101424
Author(s):  
S. Nahidinezhad ◽  
H. Sadeghi ◽  
H. Khalili
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Radiative Capture ◽  
Effective Field ◽  
Capture Process

scholarly journals A Six-Quark Dressed-Bag Description of np→dγ Radiative Capture

2003 ◽  
Vol 12 (04) ◽  
pp. 449-478 ◽  
Author(s):  
M. M. Kaskulov ◽  
P. Grabmayr ◽  
V. I. Kukulin
Keyword(s):  
Cross Sections ◽  
Radiative Capture ◽  
Form Factors ◽  
Nucleon Nucleon ◽  
Pion Exchange ◽  
Exchange Current ◽  
Meson Exchange ◽  
Capture Process ◽  
Nucleon Nucleon Interaction ◽  
Meson Exchange Currents

The radiative capture process np→dγ is considered within the framework of a recently developed six-quark dressed-bag model for the nucleon-nucleon interaction. The calculations presented here include both the nucleon current and the meson-exchange current contributions. The latter uses short-range hadronic form factors for the pion exchange currents consistent with the soft cut-off parameter ΛπNN from the NN-potential. Contributions of the pion exchange current and Δ-isobar current to the total cross-section still cannot explain the discrepancy between the theoretical and experimental cross-sections. Possibilities for new types of meson exchange currents associated with chiral fields inside multi-quark dressed-bag states in nuclei are discussed.

scholarly journals Influence of orthogonalization procedure on astrophysical S-factor for the direct α + d →6Li + γ capture process in a three-body model

2019 ◽  
Vol 49 ◽  
pp. 1960015 ◽  
Author(s):  
E. M. Tursunov ◽  
A. S. Kadyrov
Keyword(s):  
Good Description ◽  
Capture Process ◽  
Forbidden States ◽  
Body Model ◽  
S Factor ◽  
Mesh Method ◽  
Low Energies ◽  
Direct Data ◽  
Three Body ◽  
Orthogonalization Procedure

The astrophysical S-factor for the direct [Formula: see text] capture reaction is calculated in a three-body model based on the hyperspherical Lagrange-mesh method. A sensitivity of the E1 and E2 astrophysical S-factors to the orthogonalization method of Pauli forbidden states in the three-body system is studied. It is found that the method of orthogonalising pseudopotentials (OPP) yields larger isotriplet ([Formula: see text]) components than the supersymmetric transformation (SUSY) procedure. The E1 astrophysical S-factor shows the same energy dependence in both cases, but strongly different absolute values. At the same time, the E2 S-factor does not depend on the orthogonalization procedure. As a result, the OPP method yields a very good description of the direct data of the LUNA collaboration at low energies, while the SUSY transformation strongly underestimates the LUNA data.

Radiative capture reaction(p7,γ)8B at low energies

1987 ◽  
Vol 35 (1) ◽  
pp. 363-366 ◽  
Author(s):  
K. H. Kim ◽  
M. H. Park ◽  
B. T. Kim
Keyword(s):  
Radiative Capture ◽  
Capture Reaction ◽  
Radiative Capture Reaction ◽  
Low Energies

Rho-meson exchange three-body force effects

1992 ◽  
Vol 68 (24) ◽  
pp. 3503-3506 ◽  
Author(s):  
T. Sasakawa ◽  
S. Ishikawa ◽  
Y. Wu ◽  
T-Y. Saito
Keyword(s):  
Body Force ◽  
Meson Exchange ◽  
Rho Meson ◽  
Three Body

scholarly journals Shell evolution in neutron-rich Ge, Se, Kr and Sr nuclei within RHB approach

2020 ◽  
pp. 2050089
Author(s):  
M. El Adri ◽  
M. Oulne
Keyword(s):  
Energy Surface ◽  
Magic Number ◽  
Theoretical Models ◽  
Meson Exchange ◽  
Pairing Energy ◽  
Droplet Model ◽  
Energy Potential ◽  
Density Dependent ◽  
Number Formula ◽  
Dependent Point

The exotic even–even isotopic chains from [Formula: see text] to [Formula: see text] are investigated by means of the relativistic Hartree–Bogoliubov (RHB) approach with the explicit Density Dependent Meson-Exchange (DD-ME2) and Density-Dependent Point-Coupling (DD-PC1) models. The classic magic number [Formula: see text] is reproduced and the new number [Formula: see text] is predicted to be a robust shell closure by analysing several calculated quantities such as: two-neutron separation energies, two-neutron shell gap, neutron pairing energy, potential energy surface and neutron single particle energies. The obtained results are compared with the predictions of finite range droplet model (FRDM) and with the available experimental data. A reasonable and satisfactory agreement between the theoretical models and experiment is established.

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