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-decay properties of neutron-rich Ca, Ti, and Cr isotopes

Sarriguren, P.; Algora, A.; Kiss, G.

doi:10.1103/physrevc.98.024311

Cited by 13 publications

(19 citation statements)

References 86 publications

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“…Here, we make some general comments on the halflives. (1) For O and F isotopes, calculated half-lives are in fair agreement with the experimental values within a factor of 2.1-2.2, except for 22 O obtained with IM-SRG and 24 O with IM-SRG and CCEI. (2) The discrepancy between calculated and experimental half-life becomes large (a) when the discrepancy between the calculated and experimental B(GT ) is large, or (b) when the transition with the dominant branching ratio is different between the calculation and the experiment, or (c) when the Q value for the transition is small and the difference between the calculated and experimental excitation energies is large enough to lead to a substantial change of the phase space factor for the transition.…”

Section: Resultssupporting

confidence: 70%

Shell model results for nuclear β−-decay properties of sd-shell nuclei

Kumar

Srivastava

Suzuki

2020

Progress of Theoretical and Experimental Physics

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We evaluate the allowed β − -decay properties of nuclei with Z = 8 − 15 systematically under the framework of the nuclear shell model with the use of the valence space Hamiltonians derived from modern ab initio methods, such as in-medium similarity renormalization group and coupledcluster theory. For comparison we also show results obtained with fitted interaction derived from the chiral effective field theory and phenomenological USDB interaction. In this work, we have tested predictive power of ab initio effective interactions by comparing calculated results with the experimental data for β − -decay properties of sd shell nuclei. We have performed calculations for O → F, F → Ne, Ne → Na, Na → Mg, Mg → Al, Al → Si, Si → P and P → S transitions. Theoretical results of B(GT ), logf t values and half-lives, are discussed and compared with the available experimental data. Ab initio calculations of β-decay properties are very limited for the sd shell nuclei, thus present comprehensive study will add more information to it.

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Section: Resultssupporting

confidence: 70%

Shell model results for nuclear β−-decay properties of sd-shell nuclei

Kumar

Srivastava

Suzuki

2020

Progress of Theoretical and Experimental Physics

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“…where · denotes the nuclear transition matrix element between the ground and excited states |i for the isospin lowering operator, and λ = −(g A /g V ) = 1.2701 (25) is the ratio of weak axial and vector coupling constants. I used the quenching factor for the allowed Gamow-Teller transitions, q = (1/1.27) 2 = 0.62 or equivalently λ = 1, as commonly used in the pnQRPA framework [22,[33][34][35][36].…”

Section: Calculation Of the β-Decay Ratesmentioning

confidence: 99%

Suddenly shortened half-lives beyond Ni78:N=50 magic number and high-energy nonunique first-forbidden transitions

Yoshida

2019

Phys. Rev. C

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Background: β-decay rates play a decisive role in understanding the nucleosynthesis of heavy elements and are governed by microscopic nuclear-structure information. A sudden shortening of the half-lives of Ni isotopes beyond N = 50 was observed at the RIKEN-RIBF. This is considered due to the persistence of the neutron magic number N = 50 in the very neutron-rich Ni isotopes. Purpose: By systematically studying the β-decay rates and strength distributions in the neutronrich Ni isotopes around N = 50, I try to understand the microscopic mechanism for the observed sudden shortening of the half-lives. Methods: The β-strength distributions in the neutron-rich nuclei are described in the framework of nuclear density-functional theory. I employ the Skyrme energy-density functionals (EDF) in the Hartree-Fock-Bogoliubov calculation for the ground states and in the proton-neutron Quasiparticle Random-Phase Approximation (pnQRPA) for the transitions. Not only the allowed but the firstforbidden (FF) transitions are considered. Results: The experimentally observed sudden shortening of the half-lives beyond N = 50 is reproduced well by the calculations employing the Skyrme SkM* and SLy4 functionals in contrast to the monotonic shortening predicted in the preceding calculation using the SkO' functional. Conclusions: The sudden shortening of the half-lives beyond N = 50 in the neutron-rich Ni isotopes is due to the shell gap at N = 50 and cooperatively with the high-energy transitions to the low-lying 0 − and 1 − states in the daughter nuclei. The onset of FF transitions pointed out around N = 82 and 126 is preserved in the lower-mass nuclei around N = 50. This study suggests that needed is a microscopic calculation where the shell structure in neutron-rich nuclei and its associated effects on the FF transitions are selfconsistenly taken into account for predicting β-decay rates of exotic nuclei in unknown region.

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“…Among the spin-isospin excitations, the Gamow-Teller (GT) transitions have been extensively studied using different theoretical approaches: the shell model [6][7][8] and the relativistic [9][10][11][12][13][14] and non-relativistic [15][16][17][18][19][20][21][22][23][24] nuclear energy density functionals. For more details on previous studies of the GT transitions within these and other theoretical frameworks, see review articles [25][26][27] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Gamow-Teller excitations at finite temperature: Competition between pairing and temperature effects

et al. 2020

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The relativistic and non-relativistic finite temperature proton-neutron quasiparticle random phase approximation (FT-PNQRPA) methods are developed to study the interplay of the pairing and temperature effects on the Gamow-Teller excitations in open-shell nuclei, as well as to explore the model dependence of the results by using two rather different frameworks for effective nuclear interactions. The Skyrme-type functional SkM* is employed in the non-relativistic framework, while the densitydependent meson-exchange interaction DD-ME2 is implemented in the relativistic approach. Both the isoscalar and isovector pairing interactions are taken into account within the FT-PNQRPA. Model calculations show that below the critical temperatures the Gamow-Teller excitations display a sensitivity both to the finite temperature and pairing effects, and this demonstrates the necessity for implementing both in the theoretical framework. The established FT-PNQRPA opens perspectives for the future complete and consistent description of astrophysically relevant weak interaction processes in nuclei at finite temperature such as beta decays, electron capture and neutrino-nucleus reactions.

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β -decay properties of neutron-rich Ca, Ti, and Cr isotopes

Cited by 13 publications

References 86 publications

Shell model results for nuclear β−-decay properties of sd-shell nuclei

Shell model results for nuclear β−-decay properties of sd-shell nuclei

Suddenly shortened half-lives beyond Ni78:N=50 magic number and high-energy nonunique first-forbidden transitions

Gamow-Teller excitations at finite temperature: Competition between pairing and temperature effects

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