Systematics of alpha-decay half-life: new evaluations for alpha-emitter nuclides

Medeiros, E. L.; Rodrigues, Messias; Duarte, S. B.; Tavares, O. A. P.

doi:10.1088/0954-3899/32/8/b01

Cited by 72 publications

(51 citation statements)

References 24 publications

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“…However, for the particular case of 151 Eu isotope a difference by a factor ∼5 is still present, which seems to indicate that very probably the alpha transition for this isotope does not proceed with = 0. previously in our alpha decay systematics, namely, that for bismuth isotopes [6] (g = 0.385 for = 5 transitions) and the one for all alpha decay cases of = 0 transitions [8] (g = 0.122). Next, a dependence of g upon is assumed of the form…”

Section: Cbpf-nf-015/07supporting

confidence: 50%

“…On the other hand, a systematic study of the alpha decay half-lives using the same approach, but over 336 alpha emitter nuclides, has given g = 0.122 [8]. Therefore, considering the transitions of = 0 one obtains two sets of half-life evaluations, one for each value of g. Results are depicted in figure 1 as a Geiger-Nuttall-like plot.…”

Section: Cbpf-nf-015/07mentioning

confidence: 99%

“…a positive Q α -value [1]. However, for most of them the extremely high decay rates by the radioactive process of electron capture and, to a lesser extent, the β − -decay process, make alpha to alpha decay we developed [6][7][8][9] motivated by the discovery of a rare alpha activity in natural bismuth [10].…”

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confidence: 99%

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Alpha decay of Europium isotopes

Tavares¹,

Medeiros

2007

Phys. Scr.

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-Pioneer experimental indication of an extremely low alpha activity due to 151 Eu isotope (equivalent to ∼10-70 disintegrations/h-kg of nat Eu) is discussed in the framework of a simple, one-parameter model to alpha transitions developed by us recently.The present evaluated alpha activity is found equivalent to ∼18 disintegrations/h-kg, in excellent agreement with the observed decay rate. Partial alpha decay half-life evaluations for 147−153 Eu isotopes are also reported.

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Section: Cbpf-nf-015/07supporting

confidence: 50%

Section: Cbpf-nf-015/07mentioning

confidence: 99%

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Alpha decay of Europium isotopes

Tavares¹,

Medeiros

2007

Phys. Scr.

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“…The data are taken from the collected experimental results in the literature presented in Refs. [11,12,14,15]. We can see that the maximum deviation is around one order of magnitude for the whole set of 164 α heavy nuclei emitters used.…”

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confidence: 77%

α-decay systematics for superheavy elements

Duarte

Teruya

2012

Phys. Rev. C

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In this Brief Report we extend the α-decay half-life calculation to the superheavy emitter region to verify whether these nuclei satisfy the recently observed systematics [D. N. Poenaru et al., Phys. Rev. C 83, 014601 (2011); C. Qi et al., Phys. Rev. C 80, 044326 (2009)]. To establish the systematics, we have used the α-cluster potential description, which was originally developed to study α decay in connection with nuclear energy level structure [B. Buck et al., Phys. Rev. C 51, 559 (1995)]. The quantum-mechanical tunneling calculation has been employed to obtain the half-lives, showing that with this treatment the systematics are well reproduced in the region of heavy nuclei. Finally, the half-life calculation has been extended to the superheavy emitters to verify whether the systematics can still be observed.The analysis of α-decay half-life is an important tool to study nuclear level structure. Almost twenty years ago a considerable effort was invested in this direction, and a sequence of papers studied nuclear potential forms to reproduce the nuclear level distribution of the nuclei involved in the process [3][4][5]. The α-cluster model was designed with this purpose and used to determine half-lives of a wide range of ground-state α emitters. In the last version of this model [3] a Wood-Saxon-like potential form together with the semiclassical Bohr-Sommerfeld orbit quantization rule have been successfully applied for intermediate mass and heavy emitters. In these last months, the use of this potential form to reproduce the properties of first levels in ground-state spectral bands of the 90 Sr and 98 Pd nuclei has been reported, assuming the α-cluster structure for these nuclear systems [6].Recently α-decay studies were revisited by looking for a sort of universal decay law for the families of oddeven, even-even, and even-odd α emitters, which could be extended to heavier cluster emission processes [2,7]. A systematic behavior of half-lives was recognized by using the semiclassical approach (WKB barrier penetrability) with a nuclear potential obtained by the folding of the nucleonnucleon interaction with the nuclear density of the nascent fragments [1,8].A simple linear relation for experimental half-life values of α-decay in heavy-nuclei regions was observed in Ref.[9], showing that a straight line can be adjusted for the logarithm of half-lives as a function of Z 0.6 d / √ Q. Another type of empirical analysis [10] of experimental data provided general relationships to obtain half-lives for large-mass regions of α emitters, accounting for different values of angular momentum.In this Brief Report we use the α-cluster potential with the same parameters introduced in the original version [3]; however, we use an approach formally distinct from the BornSommerfeld orbit quantization treatment to determine halflives in the original α-cluster model.The α-cluster model potential is given by a Wood-Saxonlike form,where the potential parameter (depth, diffuseness, and the mix parameters, V 0 , a, and β,respectively) ...

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“…α-nucleus interactions have been studied most intensively in the context of the α-decay of nuclei (see experimental information [4][5][6][7][8][9][10][11][12][13][14][15][16], various microscopic models [17][18][19][20][21][22][23][24][25][26][27][28][29][30], macroscopic cluster models [31][32][33][34][35][36][37][38][39][40][41][42][43][44], fission models [3,46]), and the scattering of the α-particles off nuclei [47][48][49][50][51]. The physics of the fusion processes during α-capture have been investigated less deeply …”

Section: Introductionmentioning

confidence: 99%

Quantum design using a multiple internal reflections method in a study of fusion processes in the capture of alpha-particles by nuclei

Maydanyuk¹,

Zhang²,

Belchikov³

2015

Nuclear Physics A

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A high precision method to determine fusion in the capture of α-particles by nuclei is presented. For α-capture by 40 Ca and 44 Ca, such an approach gives (1) the parameters of the α-nucleus potential and (2) fusion probabilities. This method found new parametrization and fusion probabilities and decreased the error by 41.72 times for α + 40 Ca and 34.06 times for α + 44 Ca in a description of experimental data in comparison with existing results. We show that the sharp angular momentum cutoff proposed by Glas and Mosel is a rough approximation, Wong's formula and the Hill-Wheeler approach determine the penetrability of the barrier without a correct consideration of the barrier shape, and the WKB approach gives reduced fusion probabilities. Based on our fusion probability formula, we explain the difference between experimental cross-sections for α+ 40 Ca and α+ 44 Ca, which is connected with the theory of coexistence of the spherical and deformed shapes in the ground state for nuclei near the neutron magic shell N = 20. To provide deeper insight into the physics of nuclei with the new magic number N = 26, the cross-section for α + 46 Ca is predicted for future experimental tests. The role of nuclear deformations in calculations of the fusion probabilities is analyzed.

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Systematics of alpha-decay half-life: new evaluations for alpha-emitter nuclides

Cited by 72 publications

References 24 publications

Alpha decay of Europium isotopes

Alpha decay of Europium isotopes

α-decay systematics for superheavy elements

Quantum design using a multiple internal reflections method in a study of fusion processes in the capture of alpha-particles by nuclei

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