NEW ALPHA-DECAY BARRIER PENETRABILITIES WITH IGO POTENTIAL: ODD-MASS NUCLEI

1966 ◽  
Vol 44 (12) ◽  
pp. 3047-3051
Author(s):  
L. Kohlmann ◽  
T. Vörös
Keyword(s):  
Alpha Particle ◽  
Alpha Decay ◽  
Decay Energy ◽  
Method Of Calculation

Barrier penetrabilities, reduced widths, and hindrance factors are given for odd-mass alpha-particle emitters measured after 1959. The method of calculation is as in a previous publication. The calculated quantities are given for the total decay energy.

ON THE PREFORMATION FACTORS IN ALPHA DECAY

1993 ◽  
Vol 02 (04) ◽  
pp. 855-872 ◽  
Author(s):  
A. LUDU ◽  
W. GREINER ◽  
A. SANDULESCU
Keyword(s):  
Total Energy ◽  
Alpha Particle ◽  
Ground State ◽  
Large Amplitude ◽  
Collective Motion ◽  
Alpha Decay ◽  
Nuclear Surface ◽  
Particle Cluster ◽  
Shell Effects ◽  
Nonlinear Hydrodynamics

Alpha decay is described as a new large amplitude collective motion in nuclei. The total energy is evaluated in the frame of the nonlinear hydrodynamics approach which leads to the formation of solitons on the nuclear surface. A new minimum appears in the total energy due to the shell effects for 208 Pb and 4 He introduced phenomenologically. The minimum was chosen to be degenerate with the ground state minimum. Consequently a new coexistence model consisting of the usual shell model and an alpha particle cluster-like model describing a soliton moving on the nuclear surface is obtained. The corresponding amplitudes describe excellently the experimental preformation factors for alpha decay of Po isotopes.

Alpha decay half-lives for heavy and super-heavy isotopes

2017 ◽  
Vol 26 (05) ◽  
pp. 1750024
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
S. Zarrinkamar
Keyword(s):  
Experimental Data ◽  
Kinetic Energy ◽  
Half Life ◽  
Potential Model ◽  
Alpha Decay ◽  
Decay Energy ◽  
Heavy Nuclei ◽  
Proximity Potential ◽  
Empirical Estimates ◽  
Super Heavy Nuclei

We considered the systematics of Alpha-decay (AD) half-life (HL) of super-heavy nuclei (SHN) versus the decay energy and the total [Formula: see text]-kinetic energy. We have considered a potential model with Yukawa proximity potential and thereby calculated the HLs. Our results compared with experimental data and the empirical estimates. Also, we obtained [Formula: see text]-preformation factors from the ratio between theoretical and experimental results for a few super heavy nuclei. The results indicate the acceptability of the approach.

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.

Prediction of alpha-decay energy and decay half-life for unknown superheavy nuclei using resonances of exactly solvable α+nucleus potential

2012 ◽  
Vol 90 (1) ◽  
pp. 53-60
Author(s):  
Arati Devi ◽  
Basudeb Sahu ◽  
I. Mehrotra
Keyword(s):  
Half Life ◽  
Resonance Energy ◽  
Theoretical Method ◽  
Decay Chain ◽  
Alpha Decay ◽  
Neutron Number ◽  
Superheavy Nuclei ◽  
Decay Energy ◽  
Q Value ◽  
Exactly Solvable

Predictions of the results of alpha-decay energy (Q-value) and decay half-life (t1/2) are made for experimentally unknown alpha decaying systems of superheavy nuclei. Following a theoretical method proposed recently by B. Sahu, the calculations are performed using the analytical expression of the potential that simulates the nuclear+Coulomb potential of the α + daughter nucleus system. The Q-value considered as resonance energy is calculated using the behavior of the wave function, and the t1/2 is expressed analytically using the exact solutions of the potential. A global formula for the potential parameter as a function of neutron number in a given isotopic chain of nuclei is developed for the calculation of Q and t1/2. Calculations of the latter two quantities are made for the decay chain of newly discovered superheavy elements 294117, 293117, and for the isotopic chains of Z = 74 and 102. Predictions of the same parameters are made for Z = 113 and some other still unknown superheavy nuclei. It is observed that the global formula works well in evaluating correct results of Q and t1/2 for various alpha emitters.

On alpha-decay rates in heavy nuclei

1968 ◽  
Vol 46 (9) ◽  
pp. 1119-1128 ◽  
Author(s):  
L. Scherk ◽  
E. W. Vogt
Keyword(s):  
Shell Model ◽  
Alpha Particle ◽  
Residual Nucleus ◽  
Alpha Decay ◽  
Decay Rates ◽  
Nuclear Shell Model ◽  
Heavy Nuclei ◽  
Spectroscopic Factors ◽  
The One ◽  
Nuclear Shell

The alpha-decay rates in heavy nuclei are analyzed by a method in which the decay rates are factored into one-body widths and spectroscopic factors. It is shown that the discrepancy between the absolute values of the experimental alpha-decay rates and those calculated with the nuclear shell model has mainly resided in the incorrect assessment of the one-body widths and that it can be largely removed by a more direct treatment of the average interaction between the alpha particle and the residual nucleus.

AN ANALYSIS OF 178Pb TO 238U ISOTOPES WITH THE UNIVERSAL AND YUKAWA PROXIMITY POTENTIALS

2013 ◽  
Vol 22 (07) ◽  
pp. 1350051 ◽  
Author(s):  
E. JAVADIMANESH ◽  
H. HASSANABADI ◽  
S. ZARRINKAMAR
Keyword(s):  
Alpha Particle ◽  
Alpha Decay ◽  
Proximity Potential ◽  
Decay Constants ◽  
Experimental Values ◽  
Penetration Probability

The alpha particle preformation and the penetration probability by the Yukawa proximity potential in the even–even nuclei from 178 Pb to 238 U are studied. Using the experimental values of the alpha decay half-lives and the decay energies, we extract the preformation factors and the penetration probabilities. We also calculate the assault frequencies and the decay constants. The obtained results are motivating.

Alpha particle preformation factor of spherical nuclei for 67 ≤Z ≤91

2019 ◽  
Vol 34 (05) ◽  
pp. 1950039 ◽  
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
Dashty T. Akrawy
Keyword(s):  
Alpha Particle ◽  
Scaling Law ◽  
Analytical Formula ◽  
Theoretical Models ◽  
Alpha Decay ◽  
Proximity Potential ◽  
Spherical Nuclei ◽  
Experimental Values ◽  
Semi Empirical ◽  
Good Agreement

In this paper, alpha decay half-lives of spherical nuclei in the range [Formula: see text] are studied by considering the Coulomb and proximity potential model (CPPM) and calculating the alpha particle preformation factor. Comparisons are made to existing data in the literature. The half-lives are compared to the experimental values and also with the existing theoretical models, the analytical formula of Royer (R) and also within the modified analytical formula of Royer (MR) and New Akrawy–Poenaru Formula (AKRE) by Akrawy and Poenaru and the semi-empirical model based on fission theory (SemFIS) of Poenaru et al., the Universal Decay Law (UDL) of Qi et al., the Scaling Law of Brown (SLB), the Scaling Law of Horoi et al. (SLH). Compared with the experimental alpha half-lives, it can be found that the half-lives obtained using our formalism is in good agreement with the experimental data.

Localized defects in radiation-damaged zircon

2000 ◽  
Vol 56 (6) ◽  
pp. 947-952 ◽  
Author(s):  
Susana Ríos ◽  
Thomas Malcherek ◽  
Ekhard K. H. Salje ◽  
Chiara Domeneghetti
Keyword(s):  
Crystal Structure ◽  
Radiation Dose ◽  
Alpha Particle ◽  
Alpha Decay ◽  
Unit Cell ◽  
Cell Swelling ◽  
Α Decay ◽  
Natural Zircon ◽  
Localized Defects ◽  
Anisotropic Displacement Parameters

The crystal structure of a radiation-damaged natural zircon, ZrSiO_{4} (\alpha-decay radiation dose is ca 1.8 × 10^{18} α-decay events g−1), has been determined. The anisotropic unit-cell swelling observed in the early stages of the amorphization process (0.17% along the a axis and 0.62% along the c axis compared with the undamaged material) is a consequence of the anisotropy of the expansion of ZrO_{8} polyhedra. Larger anisotropic displacement parameters were found for Zr and O atoms, indicating that the distortion produced by \alpha particle-induced localized defects mainly affects the ZrO_{8} unit. The overall shape of SiO_{4} tetrahedra remains essentially undistorted, while Si—O bonds are found to lengthen by 0.43%.

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