Alpha-decay of deformed superheavy nuclei as a probe of shell closures

Ismail, M.; Seif, W. M.; Adel, A.; Abdurrahman, A.

doi:10.1016/j.nuclphysa.2016.11.010

Cited by 65 publications

(36 citation statements)

References 44 publications

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“…In many works, b eff is taken as a constant equal to 0.99-1 fm (equivalently a eff = 0.54 fm) [21][22][23][24][25][26][27][28][29]. In previous work with Abdul-latif, it was found that such an approximation yields unacceptable errors [19].…”

Section: Theoretical Frameworkmentioning

confidence: 99%

$α$-decay half-lives of superheavy nuclei with $Z=122-125$

Nagib

2021

Preprint

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For α decay half-life calculations in this work, the Coulomb and proximity potential model with a new semiempirical formula for diffuseness parameter developed in previous work [Phys. Rev. C 100, 024601 (2019)] is used. The present model in this work is compared with the generalized liquid-drop model (GLDM), universal decay law (UDL), and experimental half-lives in the region Z = 104 − 118. Next, the predicted half-lives of 51 superheavy nuclei (SHN) with Z = 122 − 125 by the present model are compared with those of GLDM, and UDL. The present model is revealed to be more accurate in reproducing experimental half-lives compared to GLDM and UDL. Moreover, it is found that the predictions of the present model and UDL are highly consistent while GLDM largely deviates from the other two. A study of the competition between α decay and spontaneous fission (SF) shows that α decay is the dominant mode. Among the studied SHN with Z = 122−125, 295−307 122 and 314−320 125 are identified as potential candidates whose half-lives are relatively long enough to be experimentally detected in the future through their α-decay chains. The identified candidates are in good agreement with other recent work.

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Section: Theoretical Frameworkmentioning

confidence: 99%

$α$-decay half-lives of superheavy nuclei with $Z=122-125$

Nagib

2021

Preprint

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“…A priori, one should not expect the effective diffuseness parameter a eff for the proximity potential and the diffuseness parameter for WS potential a WS to be equal or even play the same logical roles; this is owing to the different functional forms of the two potentials. To be more precise, consider the undeformed WS potential [1] V…”

Section: Diffuseness and Half-life For Proximity Potentialmentioning

confidence: 99%

“…Currently, within the theoretical framework of nuclear physics, especially in α decay of super heavy nuclei (SHN), there are points of intersection and divergence between different models used in calculations. Particularly, points of disagreement abound, including the particular functional form of nuclear interaction between α/cluster and the daughter nuclei, be it given by Woods-Saxon (WS) potential [1], double folding model (DFM) [2,3], liquid drop model (LDM) [4], universal proximity potential [5,6] and et cetera. Another point of disagreement stems from two competing proposals for α decay.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the diffuseness parameter a is one of the parameters with universal presence in all models regardless of the particular nuclear potential under study. Although ubiquitous, little attention is paid to the parameter which is often set constant for all nuclei [1,[8][9][10][11]. More recently, Dehghani et al investigated the role diffuseness parameter plays when deformed Woods-Saxon potential is adopted for nuclear interaction between α and daughter nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Diffuseness parameter as a bottleneck for accurate half-life calculations

Abdul-latif,

Nagib

2021

Preprint

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An investigation of the calculated α decay half-lives of super heavy nuclei (SHN) reveals that the diffuseness parameter is a great bottleneck for achieving accurate results and predictions. In particular, when universal proximity function is adopted for nuclear potential, half-life is found to vary significantly and nonlinearly as a function of diffuseness parameter. To overcome this limiting hurdle, a new semiempirical formula for diffuseness that is dependent on charge and neutron numbers is proposed in this work. With the model at hand, half-lives of 218 SHN are computed, for 68 of which there exists available experimental data and 150 of which are predicted. The calculations of half-lives for 68 SHN are compared against experimental data and the calculated data obtained by using deformed Woods-Saxon, deformed Coulomb potentials model, and six semiempirical formulas. The predictions of 150 SHN are compared against the predictions of seven of the current best semiempirical formulas. Calculations of the present study are in good agreement with the experimental half-lives outperforming all but ImSahu semiempirical formula. Moreover, the predictions of our model are consistent with predictions of the semiempirical formulas. We strongly conclude that more attention should be directed toward obtaining accurate diffuseness parameter values for using it in nuclear calculations.

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“…One can find in the list of approaches: cluster model [34], generalized density-dependent cluster model [35,36], modified two-potential approach for deformed nuclei by constructing the microscopic doublefolding potential [30], density-dependent cluster model using a two-potential approach [31], density-dependent M3Y effective interaction [37,38], generalized liquid drop model [39], unified model for α decay and α capture [40,41]. In particular, the inclusion of nuclear deformation in the α decay calculations is important since most of the α emitters have deformed shapes; this has been accounted in various way [40,42,43,44,45,46,47,48,49,50]. Recently, the effective radial potential between the axially symmetric deformed daughter nucleus and the α particle has been considered as sum of the deformed Woods-Saxon nuclear potential, of the deformed Coulomb potential, of the centrifugal potential, and also taking into account the quadrupole and the hexade-capole deformation parameters of the daughter nucleus [51].…”

Section: The Rare α Decaysmentioning

confidence: 99%

Experimental searches for rare alpha and beta decays

et al. 2019

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The current status of the experimental searches for rare alpha and beta decays is reviewed. Several interesting observations of alpha and beta decays, previously unseen due to their large half-lives (10 15 − 10 20 yr), have been achieved during the last years thanks to the improvements in the experimental techniques and to the underground locations of experiments that allows to suppress backgrounds. In particular, the list includes first observations of alpha decays of 151 Eu, 180 W (both to the ground state of the daughter nuclei), 190 Pt (to excited state of the daughter nucleus), 209 Bi (to the ground and excited states of the daughter nucleus). The isotope 209 Bi has the longest known half-life of T 1/2 ≈ 10 19 yr relatively to alpha decay. The beta decay of 115 In to the first excited state of 115 Sn (Eexc = 497.334 keV), recently observed for the first time, has the Q β value of only (147 ± 10) eV, which is the lowest Q β value known to-date. Searches and investigations of other rare alpha and beta decays ( 48 Ca, 50 V, 96 Zr, 113 Cd, 123 Te, 178m2 Hf, 180m Ta and others) are also discussed.

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Alpha-decay of deformed superheavy nuclei as a probe of shell closures

Cited by 65 publications

References 44 publications

$α$-decay half-lives of superheavy nuclei with $Z=122-125$

$α$-decay half-lives of superheavy nuclei with $Z=122-125$

Diffuseness parameter as a bottleneck for accurate half-life calculations

Experimental searches for rare alpha and beta decays

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