Study of decay modes in transfermium isotopes

Singh, Upindranath; Sharma, Priya; Kaushik, M.; Jain, S. K.; Akrawy, Dashty T.; Saxena, Gaurav

doi:10.1016/j.nuclphysa.2020.122035

Cited by 19 publications

(23 citation statements)

References 51 publications

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“…From the experimental database [53], information about 15−18 isotopes are available for each element in the range 101≤Z≤110, which is reasonably a good number to compare results from theory and thereafter make predictions of unknown territory, expeditiously. With this in view and in continuation to our earlier article [51], the transfermium nuclei in the range 101≤Z≤110 are investigated varying neutron number N≈135−186 to demonstrate ground-state properties and decay chains for all even and odd isotopes.…”

Section: Introductionmentioning

confidence: 76%

“…The most important decay types in the superheavy region are α-decay and spontaneous fission (SF) although the possibility of weak decay is also pointed out by various Refs. [25,[46][47][48][49][50] and one of our recent work [51]. The competition between α-decay and spontaneous fission (SF) offers an essential input for the detection of the superheavy nuclei in laboratory and has been employed predominately to predict decay modes or chains [7-14, 17, 18, 25, 28, 51, 52].…”

Section: Introductionmentioning

confidence: 99%

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Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)

Singh

Sharma

Sharma³

et al. 2021

Nuclear Physics A

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Transfermium nuclei (101≤Z≤110) are investigated thoroughly to describe structural properties viz. deformation, radii, shapes, magicity, etc. as well as their probable decay chains. These properties are explored using relativistic mean-field (RMF) approach and compared with other theories along with available experimental data. Neutron numbers N=152 and 162 have come forth with a deformed shell gap whereas N=184 is ensured as a spherical magic number. The region with N>168 bears witness of the phenomenon of shape transition and shape coexistence for all the considered isotopic chains. Experimental α-decay half-lives are compared with our theoretical halflives obtained by using various empirical/semi-empirical formulas. The recent formula proposed by Manjunatha et al., which results best among the considered 10 formulas, is further modified by adding asymmetry dependent terms (I and I 2). This modified Manjunatha formula is utilized to predict probable α-decay chains that are found in excellent agreement with available experimental data.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)

Singh

Sharma

Sharma³

et al. 2021

Nuclear Physics A

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“…For accurate prediction from theoretical Q-values, we choose the best possible treatment among various theoretical approaches viz. RMF [63][64][65][66], FRDM [67], RCHB [68] and WS4 [69]. In addition, we use machine learning method 'XGBoost' [42,70] to estimate Q-values.…”

Section: Resultsmentioning

confidence: 99%

A new empirical formula for α-decay half-life and decay chains of Z=120 isotopes

Saxena,

Jain,

Sharma

2021

Preprint

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Experimental α-decay half-life, spin, and parity of 398 nuclei in the range 50≤Z≤118 are utilized to propose a new formula (QF) with only 4 coefficients as well as to modify the Tagepera-Nurmia formula with just 3 coefficients (MTNF) by employing nonlinear regressions. These formulas, based on reduced mass (µ) and angular momentum taken away by the α-particle, are ascertained very effective for both favoured and unfavoured α-decay in addition to their excellent match with all (Z, N) combinations of experimental α-decay half-lives. After comparing with similar other empirical formulas of α-decay half-life, QF and MTNF formulas are purported with accuracy, minimum uncertainty and deviation, dependency on least number of fitted coefficients together with less sensitivity to the uncertainties of Q-values. The QF formula is applied to predict α-decay half-lives for 724 favoured and 635 unfavoured transitions having experimentally known Q-values. Moreover, these available Q-values are also employed to test various theoretical approaches viz. RMF, FRDM, WS4, RCHB, etc. along with machine learning method XGBoost for determining theoretical Q-values, incisively. Thereafter, using Q-values from the most precise theoretical treatment mentioned above along with the proposed formulas, probable α-decay chains for Z=120 isotopes are identified.

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“…There are also calculations that neglect nuclear structure effects, such as those in Refs. [26,27,31,32], where only transitions connecting parent and daughter ground states are considered. The nuclear matrix elements of these transitions were assumed to be a constant value phenomenologically determined and valid for all nuclei.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent calculations of electron-capture decays in Z=118, 119, and 120 superheavy isotopes

Sarriguren

2021

Preprint

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Weak decays in superheavy nuclei with proton numbers Z = 118 − 120 and neutron numbers N = 175 − 184 are studied within a microscopic formalism based on deformed self-consistent Skyrme Hartree-Fock mean-field calculations with pairing correlations. The half-lives of β + decay and electron capture are compared with α-decay half-lives obtained from phenomenological formulas. The sensitivity of the half-lives to the unknown Q-energies is studied by comparing the results obtained from different approaches for the masses. It is shown that α-decay is always dominant in this mass region. The competition between α and β + /EC decay modes is studied in seven α-decay chains starting at different isotopes of Z=118, 119, and 120.

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Study of decay modes in transfermium isotopes

Cited by 19 publications

References 51 publications

Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)

Structural properties and α-decay chains of transfermium nuclei (101≤Z≤110)

A new empirical formula for α-decay half-life and decay chains of Z=120 isotopes

Self-consistent calculations of electron-capture decays in Z=118, 119, and 120 superheavy isotopes

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