Evaluation of Beta-Delayed Neutron Emission Probabilities and Half-Lives for Z = 2–28

Birch, M.; Singh, Balraj; Dillmann, I.; Abriola, D.; Johnson, Timothy D.; McCutchan, E. A.; Sonzogni, A. A.

doi:10.1016/j.nds.2015.08.002

Cited by 28 publications

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References 231 publications

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“…The impact of the tensor interaction on the half-lives and the probabilities of β-delayed neutron emission is shown in the table. The half-life description of 74−80 Ni, obtained with the T45 EDF, are in a reasonable agreement with the experimental data [21]. The strong neutron-proton tensor force in the case of T43 set leads to the reduction of the β-decay half-lives for all studied Ni isotopes.…”

supporting

confidence: 83%

“…The parameter set T43 corresponds to the relatively strong (β/α = 2.0) neutron-proton tensor correlations and set T45 corresponds to the weak (β/α = 0.7) neutron-proton tensor correlations with respect to the likeparticle tensor part. The results of the HF-BCS calculations with the EDFs T43 and T45 are in a reasonable agreement with the experimental data [21,22] (see Ref. [23] for more details).…”

supporting

confidence: 83%

“…The strong neutron-proton tensor force in the case of T43 set leads to the reduction of the β-decay half-lives for all studied Ni isotopes. In case of the β-decay of 76 Ni the neutron-emission probabilities, calculated with T43 and T45 EDFs, are in a reasonable agreement with the experimental data, P tot = 14.0 ± 3.6% [21]. The N = 50 shell-closure is reflected in the tensor-force effect, as is shown in the table.…”

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confidence: 80%

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The impact of the tensor interaction on the β-delayed neutron emission of the neutron-rich Ni isotopes

et al. 2018

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Abstract. The neutron emission of the β-decay of 74,76,78,80 Ni are studied within the quasiparticle random phase approximation with the Skyrme interaction. The coupling between one-and two-phonon terms in the wave functions of the low-energy 1 + states of the daughter nuclei is taken into account. It is shown that the strength decrease of the neutronproton tensor interaction leads to the increase of the half-life and the neutron-emission probability.Study of the β-decay properties of the nuclei near the doubly magic isotope 78 Ni plays the crucial role in the modeling of the astrophysical r-process [1]. The multi-neutron emission is a multistep process consisting of the β-decay of the parent nucleus (N, Z) which results in feeding the excited states of the daughter nucleus (N -1, Z + 1) followed by the multi-neutron emissions to the ground state or γ-deexcitation to the ground state of the product nucleus (N -1 -X, Z + 1) [2]. The microscopic study of the β-decay half-lives and the β-delayed neutron-emission probabilities of the nuclei with high N/Z ratio asymmetry makes it possible to reconstruct the β-strength function [2,3]. Taking into account the tensor interaction has a substantial effect on the Gamow-Teller (GT) transitions within the β-decay window [4]. A redistribution of the GT strength has been found due to the impact of the tensor correlations and 2p-2h fragmentation of the GT transitions [5].One of the successful tools for studying charge-exchange nuclear modes is the quasiparticle random phase approximation (QRPA) with the self-consistent mean-field derived from a Skyrme energydensity functional (EDF), see e.g., [6][7][8][9]. These QRPA calculations enable one to describe the properties of the ground state and excited charge-exchange states using the same EDF. As proposed in Ref.[10], the study of the multineutron emission, following the β-decay, requires taken into account the phonon-phonon coupling (PPC). The finite rank separable approximation (FRSA) [11][12][13] for the residual interaction allows one to perform the calculations in large configurational spaces.In this paper, we investigate the impact of the tensor correlations on the probability of the neutron emission. As the parameter set in the particle-hole channel, we use the Skyrme EDFs TIJ [14], which take into account the tensor terms. Indices I and J refer to the proton-neutron (β) and like-particle (α) coupling constants that define the contribution to the spin-orbit potential from the J 2 terms:

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confidence: 83%

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confidence: 83%

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confidence: 80%

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The impact of the tensor interaction on the β-delayed neutron emission of the neutron-rich Ni isotopes

et al. 2018

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“…This issue is widely recognized and addressed in detail in Section 2.1.2.1-1 of IAEA Report [3] and these experimental publications (e.g., [4][5][6]). Additionally, if a detector does not actually cover the entire 4π solid angle, due to beam entrance and exit ports, unknown angular distributions can also add to the uncertainty of the extracted total cross section.…”

mentioning

confidence: 99%

Comment on “Cross section of the C13(α,n)O16 reaction: A background for the measureme

Peters

2017

Phys. Rev. C

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“…This is one of the primary motivations for a next generation of radioactive beam facilities such as RIBF, FAIR, and FRIB [33]. Despite of these difficulties, some experiments have succeeded to reach the r-process -examples include the half-life measurement of 130 Cd at ISOLDE/CERN [49], the half-life measurement of 78 Ni at NSCL/MSU [50], mass measurements at ATLAS/ANL [51], recent measurements near N = 126 at FRS/GSI [52], and the first results from a next generation radioactive beam facility at RIBF/RIKEN where a broad range of new half-lives in the r-process has been determined [53]. A similar challenge has been the theoretical prediction of nuclear properties along the r-process path with sufficient precision so as to be useful for astrophysical applications.…”

Section: Models For Neutron Capture Processesmentioning

confidence: 99%

Trends in nuclear astrophysics

Schatz

2016

J. Phys. G: Nucl. Part. Phys.

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Evaluation of Beta-Delayed Neutron Emission Probabilities and Half-Lives for Z = 2–28

Cited by 28 publications

References 231 publications

The impact of the tensor interaction on the β-delayed neutron emission of the neutron-rich Ni isotopes

The impact of the tensor interaction on the β-delayed neutron emission of the neutron-rich Ni isotopes

Comment on “Cross section of the C13(α,n)O16 reaction: A background for the measureme

Trends in nuclear astrophysics

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