Cluster decay half-lives using asymmetry dependent densities

2021 ◽  
Author(s):  
Vahid Dehghani ◽  
S. A. Alavi ◽  
‪Rohollah Razavinejad ◽  
Asim Soylu ◽  
fahrettin koyuncu
Keyword(s):  
Asymmetry Parameter ◽  
Skin Type ◽  
Cluster Decay ◽  
Proton Density ◽  
Neutron Skin ◽  
Charge Radii ◽  
Density Distributions ◽  
Double Folding ◽  
Theory And Experiment

Abstract Adopting different neutron and proton density distributions the cluster decay half-lives have been investigated using double-folding potentials with constant and nuclear asymmetry dependent sets of the parameters of nuclear densities. Two adopted asymmetry dependent sets of the parameters are fitted based on the microscopic calculations and calculated based on the neutron skin/halo-type nuclei assumption and employing experimental rms charge radii. The bulk agreement between theory and experiment has been obtained for entire sets of parameters using calculated cluster preformation probability. The very little differences between skin and halo-type assumption have been observed. However, the notable role of the asymmetry parameter has been seen in relatively large differences between the skin and skin-type with zero thickness.

Charge Radii of Tin Isotopes and Their Proton-Density Distributions within the Dispersive Optical Model

2020 ◽  
Vol 83 (1) ◽  
pp. 9-14
Author(s):  
O. V. Bespalova ◽  
A. A. Klimochkina ◽  
T. I. Spasskaya
Keyword(s):  
Optical Model ◽  
Proton Density ◽  
Charge Radii ◽  
Density Distributions

Isospin dependence of the nucleon density distributions

2017 ◽  
Vol 26 (10) ◽  
pp. 1750065
Author(s):  
Yongli Xu ◽  
Hairui Guo ◽  
Yinlu Han ◽  
Qingbiao Shen
Keyword(s):  
Experimental Data ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Nucleon Density ◽  
Charge Radii ◽  
Density Distributions ◽  
Neutron Skin Thickness ◽  
Isospin Dependence ◽  
Two Parameter ◽  
Good Agreement

The nucleon density distributions were usually described by the two-parameter Fermi shape formula. In this work, the isospin effects in the nucleon density distributions are considered, and a three-parameter formula is proposed and modified by simultaneously considering the experimental data of 885 root-mean-square (rms) charge radii and neutron skin thickness of 26 stable nuclei. The improved nucleon density formula is physically reasonable and achieves a good agreement for the charge radii and neutron skin thickness calculated with the new nucleon density formula comparing the available experimental data.

5-MOP Induced Protection Against Epidermal DNA Damage by Ultraviolet Radiation in Human Skin: The Role of the Skin Type

1991 ◽  
pp. 201-209
Author(s):  
Antony R. Young ◽  
Christopher S. Potten ◽  
Caroline A. Chadwick ◽  
Gillian M. Murphy ◽  
A. Jeffrey Cohen
Keyword(s):  
Dna Damage ◽  
Ultraviolet Radiation ◽  
Human Skin ◽  
Skin Type

scholarly journals Role of Different Model Ingredients in the Exotic Cluster-Decay of 56Ni*

2012 ◽  
Vol 57 (8) ◽  
pp. 796
Author(s):  
N.K. Dhiman
Keyword(s):  
Density Distribution ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Cluster Decay ◽  
Nuclear Radius ◽  
Technical Parameters ◽  
Ion Collisions

We consider the cluster decay of 56Ni* formed in heavy-ion collisions, by using different parameters proposed by different authors for the Fermi density distribution and the nuclear radius. Our study reveals that different technical parameters do not alter significantly the structure of fractional yields. The cluster decay half-lives of different clusters lie within ±10% for different Fermi density parameters and nuclear radii and, therefore, justify the current set of parameters used in the literature for the calculation of cluster decays.

Study of the dependence of alpha decay half-life on the surface symmetry energy

2020 ◽  
Vol 29 (09) ◽  
pp. 2050070
Author(s):  
S. Nejati ◽  
O. N. Ghodsi
Keyword(s):  
Symmetry Energy ◽  
Half Life ◽  
Surface Region ◽  
Alpha Decay ◽  
Proton Density ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Mother And Daughter ◽  
Energy Coefficient ◽  
Finite Nuclei

In this study, the effect of the surface symmetry energy on the neutron skin thickness and division of it into the bulk and surface parts are investigated by determination of the symmetry energy coefficient [Formula: see text] of finite nuclei. We demonstrate the importance of the isospin asymmetry distribution in the symmetry energy coefficient of finite nuclei at the surface region. We attempt to find out how different surface symmetry energies may affect alpha decay half-life. The Skyrme interactions are used to describe the neutron and proton density distributions and to calculate the symmetry energy coefficient [Formula: see text] of four nuclei and the surface symmetry energy. The chosen Skyrme interactions can produce the binding energy and root-mean-square charge radii of both mother and daughter nuclei. We single out the spherical isotones of [Formula: see text] named [Formula: see text]Pb, [Formula: see text]Po, [Formula: see text]Rn and [Formula: see text]Ra for daughter nuclei and explore the dependence of the bulk and surface contributions on the surface symmetry energy. The half-life of mother nuclei, i.e., [Formula: see text]Po, [Formula: see text]Rn, [Formula: see text]Ra and [Formula: see text]Th, is employed to investigate the extent to which it is affected by different surface symmetry energies. The calculated half-lives show a downward tendency for different surface symmetry energies which can be caused by various neutron skin thicknesses.

Microscopic description of the fusion excitation function of 32,36S+90,94,96Zr

2020 ◽  
Vol 29 (07) ◽  
pp. 2050046
Author(s):  
M. Rashdan ◽  
T. A. Abdel-Karim
Keyword(s):  
Excitation Function ◽  
Excited States ◽  
Density Functional ◽  
Neutron Density ◽  
Energy Density Functional ◽  
Hartree Fock ◽  
Density Distributions ◽  
Text Interaction ◽  
Good Agreement

The fusion excitation function for the systems [Formula: see text]S+[Formula: see text]Zr is investigated using a microscopic internuclear potential derived from Skyrme energy density functional. The inputs in this approach are the proton and neutron density distributions of the interacting nuclei, which are derived from Skyrme–Hartree–Fock calculations. The SkM[Formula: see text] interaction is used in the calculation of the nuclear densities as well as the internuclear potential. The coupling to low lying inelastic excited states of target and projectile is considered. The role of the neutron transfer is discussed, where it is considered through the CCFULL model calculation. A good agreement with the experimental data is obtained without adjustable parameters.

DENSITY-DEPENDENT CLUSTER MODEL OF α DECAY

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2365-2368 ◽  
Author(s):  
CHANG XU ◽  
ZHONGZHOU REN
Keyword(s):  
Nuclear Physics ◽  
Cluster Model ◽  
Daughter Nucleus ◽  
Nucleon Nucleon ◽  
Nucleon Interaction ◽  
Α Decay ◽  
Density Dependent ◽  
Density Distributions ◽  
Nucleon Nucleon Interaction ◽  
Double Folding

A new cluster model of α decay is proposed where the effective potential between α-cluster and daughter nucleus is obtained from the double folding integral of the renormalized M3Y nucleon-nucleon interaction and of the density distributions of α particle and daughter nucleus. Without introducing any extra adjustment on the potential, the new model (named as the density-dependent cluster model) can successfully reproduce the experimental half-lives of α decay within a factor of 3. The model also works well for new superheavy elements which are the current interests of nuclear physics and chemistry.

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