scholarly journals Properties of exotic nuclei and their linkage to the nucleonic interaction

2020 ◽  
Vol 29 (01) ◽  
pp. 1930008
Author(s):  
H. Nakada
Keyword(s):  
Shell Structure ◽  
Effective Interaction ◽  
Tensor Force ◽  
Exotic Nuclei ◽  
Magic Numbers ◽  
Spin Dependence ◽  
Wide Range ◽  
Realistic Interaction ◽  
Isospin Dependence ◽  
Finite Nuclei

The structure of exotic nuclei sheds new light on the linkage of the nuclear structure to the nucleonic interaction. The self-consistent mean-field (SCMF) theories are useful to investigate this linkage, which are applicable to many nuclei covering almost the whole range of the nuclear chart without artificial truncation of model space. For this purpose, it is desired to develop effective interaction for the SCMF calculations well connected to the bare nucleonic interaction. Focusing on ground-state properties, I show the results of SCMF calculations primarily with the Michigan-three-range-Yukawa (M3Y)-type semi-realistic interaction, M3Y-P6 and M3Y-P6a to be precise, and discuss in detail how the nucleonic interaction affects the structure of nuclei including those far off the [Formula: see text]-stability. The central channels of the effective interaction are examined by the properties of the infinite nuclear matter up to the spin dependence and the isospin dependence. While experimental information of the infinite matter is obtained by extrapolating systematic data on finite nuclei in principle, it is not easy to constrain the spin dependence and the isospin dependence without connection to the bare nucleonic interaction. The noncentral channels play important roles in the shell structure of the finite nuclei. The tensor force is demonstrated to affect [Formula: see text]- or [Formula: see text]-dependence of the shell structure and the magic numbers, on which the spin–isospin channel in the central force often acts cooperatively. By using the M3Y-P6 interaction, the prediction of magic numbers is given in a wide range of the nuclear chart, which is consistent with almost all the available data. In relation to the erosion of magic numbers in unstable nuclei, effects of the tensor force on the nuclear deformation are also argued, being opposite between nuclei at the [Formula: see text]- and the [Formula: see text]-closed magicities. Qualitatively consistent with the [Formula: see text]-force effect on the [Formula: see text]-splitting suggested from the chiral effective field theory, the density-dependent LS channel, which is newly introduced in M3Y-P6a, reproduces the observed kinks in the differential charge radii at the [Formula: see text]-closed magic numbers and predicts anti-kinks at the [Formula: see text]-closed magic numbers. The pairing correlation has significant effects on the halos near the neutron drip line. A new mechanism called “unpaired-particle haloing” is disclosed.

HADRONIC INTERACTION AND STRUCTURE OF EXOTIC NUCLEI

2009 ◽  
Vol 18 (10) ◽  
pp. 1981-1985
Author(s):  
TAKAHARU OTSUKA
Keyword(s):  
Shell Structure ◽  
Body Force ◽  
Tensor Force ◽  
Exotic Nuclei ◽  
Magic Numbers ◽  
Nuclear Forces ◽  
Hadronic Interaction ◽  
Body Interaction ◽  
Hole Excitation ◽  
Three Body

I will overview recent studies on the evolution of the shell structure in stable and exotic nuclei, and will show its relevance to hadronic interaction, including nuclear forces. This shell evolution is primarily due to the tensor force. The robust mechanism and some examples will be presented. Such examples include the disappearance of existing magic numbers and the appearance of new ones. The shell structure and existing limit of nuclei depend also on the three-body interaction in a specific way. I will sketch how the Δ-hole excitation induced three-body force (Fujita-Miyazawa force) modifies them.

scholarly journals Mean Field with Tensor Force and Shell Structure of Exotic Nuclei

2006 ◽  
Vol 97 (16) ◽  
Author(s):  
Takaharu Otsuka ◽  
Toshiaki Matsuo ◽  
Daisuke Abe
Keyword(s):  
Shell Structure ◽  
Mean Field ◽  
Tensor Force ◽  
Exotic Nuclei

scholarly journals Effect of Tensor Force on the Multipole Resonances of Finite Nuclei

2012 ◽  
Vol 196 ◽  
pp. 322-327
Author(s):  
Li-Gang Cao ◽  
Hiroyuki Sagawa ◽  
Gianluca Colò
Keyword(s):  
Tensor Force ◽  
Finite Nuclei

scholarly journals Management activities in the field of wellness physical health activity of population in large cities of Europe: analysis of approaches

2020 ◽  
Vol 8 (6) ◽  
pp. 221-229
Author(s):  
Yevgeniy Borodin ◽  
Valerii Makashov
Keyword(s):  
Physical Activity ◽  
Local Governments ◽  
Effective Interaction ◽  
Public And Private ◽  
Large Cities ◽  
Increased Risk ◽  
Wide Range ◽  
Logical Method ◽  
Risk Of Disease ◽  
National Governments

Introduction. WHO has adopted a Strategy for Physical Activity and calls on national governments and local governments to update this area. The priority of this area is most obvious in large cities, whose population leads a predominantly sedentary lifestyle, resulting in an increased risk of disease and general deterioration in health both nationally and globally. The purpose of the study is to study the mechanisms of stimulating the population to develop physical activity, involvement in physical culture and mass sports in the activities of local authorities. Analysis of models of social interaction in order to form the commitment of the population to physical activity with the implementation of this value in all spheres of life. Material and methods - analysis of laws, comparative analysis, logical method. The results of the study - in some countries a network of healthy municipalities has been established and operates as part of the implementation of measures to support physical activity. In the EU, local governments have been paying close attention to this for several decades, accumulating a wide range of tools for effective interaction between government, the public and private sectors. Conclusion - this experience is extremely useful for Ukraine, namely in the study of the functions, forms and methods of physical activity management in large cities, especially in the context of the COVID19 pandemic.

scholarly journals System of criteria for effective interaction between the police and society in the interests of public security

2019 ◽  
pp. 66-72
Author(s):  
Сергей Ханин ◽  
Sergey Hanin
Keyword(s):  
Public Safety ◽  
Effective Interaction ◽  
Public Security ◽  
Personal Value ◽  
Constructive Dialogue ◽  
Wide Range

The article attempts to form a system of criteria to assess the effectiveness of the emerging partnership between the police and society, the purpose of which is to ensure public safety. Among the groups of criteria that determine the basis of interaction and their effectiveness, the author highlights the legal, organizational and personal value. The author comes to the conclusion that the emerging system of criteria for assessing the effectiveness of police and society interaction is designed to determine a wide range of prospects and features of a constructive dialogue that can eliminate the confrontation of interests and destructiveness both in relation to society and in relation to police.

Different folding models for 6Li+28Si elastic scattering

2020 ◽  
Vol 29 (09) ◽  
pp. 2050075
Author(s):  
Awad A. Ibraheem ◽  
M. El-Azab Farid ◽  
Eman Abd El-Rahman ◽  
Zakaria M. M. Mahmoud ◽  
Sherif R. Mokhtar
Keyword(s):  
Elastic Scattering ◽  
Optical Potential ◽  
Optical Model ◽  
Effective Interaction ◽  
Text Structure ◽  
Normalization Factor ◽  
Wide Range ◽  
Cluster Density ◽  
Double Folding ◽  
Good Agreement

In this work, the elastic scattering of 6Li+[Formula: see text]Si system at wide range energies from 76 to 318[Formula: see text]MeV is analyzed. The analysis is carried out in the framework of the optical model (OM). Two different methods are adopted for nuclear optical potential of this system. The first method is the double folding cluster (DFC) for the real part supplied with an imaginary part in the Woods–Saxon (WS) form. In the second one, the double folding (DF) model based upon São Paulo potential (SPP) is used as real and imaginary parts each multiplied by a corresponding normalization factor. For [Formula: see text]Si, the full [Formula: see text]-cluster density is considered while the [Formula: see text]-deuteron ([Formula: see text]–[Formula: see text]) structure is considered for 6Li. Therefore, the DFC real central part is calculated by folding both [Formula: see text]–[Formula: see text] and [Formula: see text]–[Formula: see text] effective interaction between target and nuclei over the cluster densities of the target and projectile. The derived renormalized potentials give a successful description of the data. The present results are in good agreement with the previous work. This agreement confirms the validity of the present methods to generate nucleus–nucleus optical potentials.

Tensor force effect on proton shell structure in neutron-rich Ca isotopes

2013 ◽  
Vol 56 (9) ◽  
pp. 1719-1729 ◽  
Author(s):  
ZhenYu Li ◽  
YanZhao Wang ◽  
GuoLiang Yu ◽  
JianZhong Gu
Keyword(s):  
Shell Structure ◽  
Tensor Force ◽  
Force Effect ◽  
Proton Shell

Neutron skin thickness of finite nuclei with finite range effective interaction in droplet model

2018 ◽  
Vol 27 (06) ◽  
pp. 1850049 ◽  
Author(s):  
M. Pal ◽  
S. Chakraborty ◽  
B. Sahoo ◽  
S. Sahoo
Keyword(s):  
Symmetry Energy ◽  
Effective Interaction ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Droplet Model ◽  
Density Region ◽  
Neutron Skin Thickness ◽  
Number Formula ◽  
Energy Formula ◽  
Finite Nuclei

We analyze the relation between the symmetry energy coefficient [Formula: see text] of finite nuclei with mass number [Formula: see text] in the semi-empirical mass formula. The nuclear matter symmetry energy [Formula: see text] at reference density [Formula: see text] in the subsaturation density region can be determined by the symmetry energy [Formula: see text] and its density slope [Formula: see text] at the saturation density [Formula: see text]. From this relation, the neutron skin thickness ‘[Formula: see text]’ in finite nuclei with droplet model are correlated to the various symmetry energy parameters. A prominent role of the bulk symmetry energy [Formula: see text] to the so-called surface stiffness coefficient [Formula: see text] is observed in deriving the size of the neutron skin. Two types of neutron skins are distinguished: the “surface” and the “bulk”. The linear dependence of the neutron skin thickness for different stable nuclei ([Formula: see text]) on the slope [Formula: see text] of the symmetry energy as well as on the relative neutron excess [Formula: see text] is observed. Though the value of the surface width is found to be limited within 0.1[Formula: see text]fm, its contribution should not be neglected to measure neutron skin thickness.

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