scholarly journals THEORETICAL STUDY OF DECAY RATES OF NEWLY SYNTHESIZED SUPER HEAVY ELEMENT

2020 ◽  
Vol 9 (12) ◽  
Keyword(s):  
Alpha Decay ◽  
Theoretical Explanation ◽  
Decay Rates ◽  
Outer Side ◽  
Potential Well ◽  
Formation Factor ◽  
Well Model ◽  
Square Well ◽  
Penetration Probability ◽  
Good Agreement

We have studied half lives and penetration probability for even-even nuclei having atomic number 106 to 118.The frequency have been calculated using classical methods. The penetration probability was estimated by modifying the Gamow’s theory of alpha decay by varying the potential and it was found to be in a very good agreement with the experimental half-lives. The half-lives for alpha decay can be mainly determined by penetration probability. We have seen that in simple spherical symmetric potential there is a discontinuous jump of the potential which tends to be not physical because the force there becomes infinite. In this present work the square well model is modified by smoothing the potential well inside the nucleus to the top of the coulomb barrier at the outer side of the potential well which we will call as S-potential. The pre-formation factor was calculated from experimental alpha decay energies and half-lives. The theoretical explanation was experimentally proved by Geiger-Nuttall law. The S-potential (Smoothened) gives a better match with the experimental data.

Correlation between alpha preformation probability, decay half-life and barrier assault frequency

2017 ◽  
Vol 26 (05) ◽  
pp. 1750026 ◽  
Author(s):  
M. Ismail ◽  
A. Y. Ellithi ◽  
A. El-Depsy ◽  
O. A. Mohamedien
Keyword(s):  
Barrier Height ◽  
Alpha Particle ◽  
Half Life ◽  
Alpha Decay ◽  
Strong Correlations ◽  
Alpha Emitters ◽  
Barrier Penetration ◽  
Penetration Probability ◽  
Good Agreement

Calculation of alpha particle preformation probabilities for some alpha emitters is considered in the framework of a recent proposed barrier penetration formula, by two different approximations. The behavior of alpha particle preformation probability with the variation of neutron and proton numbers of parent nuclei for isotopes, in the range [Formula: see text], and isotones, in the range [Formula: see text], is investigated. The same correlations are then studied for the alpha decay half-life, the barrier assault frequency, barrier height and barrier penetration probability. Strong correlations are found and in a good agreement with experimental expectations.

Structure factors of binary liquid metal alloys within the square-well model

Open Physics ◽  
2009 ◽  
Vol 7 (3) ◽  
Author(s):  
Nikolay Dubinin ◽  
Vladimir Filippov ◽  
Olga Malkhanova ◽  
Nikolay Vatolin
Keyword(s):  
Random Phase Approximation ◽  
Random Phase ◽  
Spherical Approximation ◽  
Mean Spherical Approximation ◽  
Structure Factors ◽  
Well Model ◽  
The Mean ◽  
Square Well ◽  
Experimental Structure ◽  
Good Agreement

AbstractThe procedure suggested previously for the description of the square-well (SW) fluid within the framework of the mean spherical approximation is applied to calculate the structure factors of pure Na, pure K, and 0.5Na-0.5K alloy in liquid state. It is shown that our variations of the SW depth and SW width enable us to achieve a good agreement between calculated and experimental structure factors. The procedure under consideration gives more accurate results than the random phase approximation for the same values of the SW parameters.

ANALYTIC SOLUTION FOR THE POTENTIAL BARRIERS IN ALPHA-DECAY PROCESS FOR Po ISOTOPES

2013 ◽  
Vol 22 (11) ◽  
pp. 1350080 ◽  
Author(s):  
H. HASSANABADI ◽  
E. JAVADIMANESH ◽  
S. ZARRINKAMAR
Keyword(s):  
Ground State ◽  
Analytic Solution ◽  
Alpha Decay ◽  
Decay Process ◽  
Potential Barriers ◽  
New Formula ◽  
Penetration Probability ◽  
Good Agreement

We study the half-lives of some nuclei via the alpha-decay process in ground-state to ground-state ( g.s. → g.s. ) transitions. To go through the problem, we consider the parabola and WKB approximations to fin the penetration probability. This new formula is used to evaluate alpha-decay half-lives and a good agreement with the experiment is obtained.

A systematic calculation of alpha decay half-lives using a new approach for barrier penetration probability

2016 ◽  
Vol 25 (09) ◽  
pp. 1650069 ◽  
Author(s):  
M. Ismail ◽  
A. Y. Ellithi ◽  
A. EL-Depsy ◽  
O. A. Mohamedien
Keyword(s):  
Experimental Data ◽  
Coulomb Barrier ◽  
Alpha Decay ◽  
New Approach ◽  
Systematic Calculation ◽  
Barrier Penetration ◽  
Spherical Nuclei ◽  
New Formula ◽  
Penetration Probability ◽  
Good Agreement

A systematic calculation of alpha decay half-lives of 347 nuclei is considered in the framework of the Wentzel–Kramers–Brillouin (WKB) approximation using two formulas. A recently proposed barrier penetration formula, with some modified parameters, is used first. Second, a new analytic barrier penetration formula is derived by taking into account the centrifugal potential. A good agreement with experimental data is achieved especially for spherical nuclei. The new formula reproduces experimental alpha decay half-lives with a satisfying accuracy especially for penetration energies much lower than the Coulomb barrier.

scholarly journals Self-Diffusion in Liquid Copper, Silver, and Gold

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1651
Author(s):  
Nikolay Dubinin
Keyword(s):  
Liquid Copper ◽  
Spherical Approximation ◽  
Mean Spherical Approximation ◽  
Self Diffusion ◽  
Well Model ◽  
Different Temperatures ◽  
The Mean ◽  
Square Well ◽  
Theoretical Results ◽  
Good Agreement

The recently developed by us semi-analytical representation of the mean spherical approximation in conjunction with the linear trajectory approximation is applied to the quantitative study of self-diffusivities in liquid Cu, Ag and Au at different temperatures. The square-well model is employed for the description of the interatomic pair interactions in metals under study. It is found that our theoretical results are in good agreement with available experimental and computer-simulation data and can be considered as a prediction when such data are absent.

ALPHA-DECAY STUDIES ON 130-153Eu NUCLEI

2013 ◽  
Vol 22 (11) ◽  
pp. 1350081 ◽  
Author(s):  
K. P. SANTHOSH ◽  
B. PRIYANKA
Keyword(s):  
Experimental Data ◽  
Potential Model ◽  
Alpha Decay ◽  
Shell Closure ◽  
Proximity Potential ◽  
Deformed Nuclei ◽  
Neutron Shell ◽  
Good Agreement ◽  
Neutron Shell Closure

The alpha-decay half-lives of the 24 isotopes of Eu (Z = 63) nuclei in the region 130≤A≤153, have been studied systematically within the Coulomb and proximity potential model (CPPM). We have modified the assault frequency and re-determined the half-lives and they show a better agreement with the experimental value. We have also done calculations on the half-lives within the recently proposed Coulomb and proximity potential model for deformed nuclei (CPPMDN). The computed half-lives are compared with the experimental data and they are in good agreement. Using our model, we could also demonstrate the influence of the neutron shell closure at N = 82, in both parent and daughter nuclei, on the alpha-decay half-lives.

scholarly journals The spin-up of a linearly stratified fluid in a sliced, circular cylinder

2016 ◽  
Vol 806 ◽  
pp. 254-303
Author(s):  
R. J. Munro ◽  
M. R. Foster
Keyword(s):  
Circular Cylinder ◽  
Rossby Waves ◽  
Rotation Axis ◽  
A Priori ◽  
Propagation Speed ◽  
Stratified Fluid ◽  
Decay Rates ◽  
The Waves ◽  
Western Half ◽  
Good Agreement

A linearly stratified fluid contained in a circular cylinder with a linearly sloped base, whose axis is aligned with the rotation axis, is spun-up from a rotation rate $\unicode[STIX]{x1D6FA}-\unicode[STIX]{x0394}\unicode[STIX]{x1D6FA}$ to $\unicode[STIX]{x1D6FA}$ (with $\unicode[STIX]{x0394}\unicode[STIX]{x1D6FA}\ll \unicode[STIX]{x1D6FA}$) by Rossby waves propagating across the container. Experimental results presented here, however, show that if the Burger number $S$ is not small, then that spin-up looks quite different from that reported by Pedlosky & Greenspan (J. Fluid Mech., vol. 27, 1967, pp. 291–304) for $S=0$. That is particularly so if the Burger number is large, since the Rossby waves are then confined to a region of height $S^{-1/2}$ above the sloped base. Axial vortices, ubiquitous features even at tiny Rossby numbers of spin-up in containers with vertical corners (see van Heijst et al.Phys. Fluids A, vol. 2, 1990, pp. 150–159 and Munro & Foster Phys. Fluids, vol. 26, 2014, 026603, for example), are less prominent here, forming at locations that are not obvious a priori, but in the ‘western half’ of the container only, and confined to the bottom $S^{-1/2}$ region. Both decay rates from friction at top and bottom walls and the propagation speed of the waves are found to increase with $S$ as well. An asymptotic theory for Rossby numbers that are not too large shows good agreement with many features seen in the experiments. The full frequency spectrum and decay rates for these waves are discussed, again for large $S$, and vertical vortices are found to occur only for Rossby numbers comparable to $E^{1/2}$, where $E$ is the Ekman number. Symmetry anomalies in the observations are determined by analysis to be due to second-order corrections to the lower-wall boundary condition.

LX-ray Spectra and E2 Internal Conversion Coefficients in Radon and Radium

1973 ◽  
Vol 28 (10) ◽  
pp. 1635-1641 ◽  
Author(s):  
A. G. de Pinho ◽  
M. Weksler
Keyword(s):  
Excited States ◽  
Internal Conversion ◽  
Electric Quadrupole ◽  
Alpha Decay ◽  
X Ray ◽  
Internal Conversion Coefficients ◽  
Conversion Coefficients ◽  
Good Agreement

The X-ray spectra resulting from the internal conversion of electric quadrupole transitions following the alpha decay of Th230 and Ra226 were analysed with a Si (Li) spectrometer. From the knowledge of the Coster-Kronig and fluorescence yields, the internal conversion coefficients of the E2 transitions from the first excited states in Ra226 and Rn222 could be deduced. Results are in good agreement with theoretical values.

On the magnitude of alpha-decay rates

1967 ◽  
Vol 25 (2) ◽  
pp. 86-89
Author(s):  
L. Scherk ◽  
E.W. Vogt
Keyword(s):  
Alpha Decay ◽  
Decay Rates
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