Resonances in Exotic $^7$He Nucleus within the No-Core Shell Model

Mazur, I. A.; Shirokov, A. M.; Shin, Ik Jae; Mazur, A. I.; Kim, Y.; Maris, Pieter; Vary, James P.

doi:10.48550/arxiv.2001.08898

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…Our data correlate fairly well with the data obtained within the framework of the NCSMC [30]. It is interesting to compare the resonance energies which are calculated in the current work with the same values obtained in the framework of approach SS-HORSE [33], since this approach, first, is also based on NCSM and, second, this work also uses the NN-potential of Daejeon16. This comparison shows that the use of the extrapolation procedure lowers the values of the resonance energies more than the The results of our calculations of the decay widths of 7 He nucleus resonances are presented in Tab.…”

Section: Results Of the Calculations And Discussionsupporting

confidence: 84%

“…Among them the methods which combine NCSM and Resonating Group Model (RGM) namely No-Core Shell Model / Resonating Group Model (NCSM/RGM) [28] and No-Core Shell Model with Continuum (NCSMC) [29][30][31][34][35][36][37] seem to be the most versatile. To describe resonances (including those undergoing multiparticle decay) using calculations of scattering phase shifts the NCSM-based SS-HORSE method was proposed [32,33]. Some nuclear resonances can be also studied with the use of mentioned above GSM [8].…”

Section: Introductionmentioning

confidence: 99%

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Detailed study of decay properties of 7He nucleus states in ab initio approach

Rodkin,

Tchuvil'sky

2021

Preprint

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The energies and decay widths of the states of the exotic 7 He nucleus are studied in an ab initio approach. The spectrum of these states is calculated using No-Core Shell Model and corresponding extrapolation procedure. Well-proven on a large amount of data the Daejeon16 potential is used in the calculations. The previously developed NCSM-based approach, which includes a method for constructing the basis of orthogonalized functions of cluster channels and a procedure for matching the cluster form factors obtained within this method with the corresponding asymptotic wave functions, is applied to compute the decay widths of the levels. The possibilities of the approach for calculating the partial decay widths of nuclear states into various channels strongly differing in type of fragmentation, spin, angular momentum of relative motion, and amplitude are demonstrated. The results obtained are compared with the results of other microscopic calculations.

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Section: Results Of the Calculations And Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Detailed study of decay properties of 7He nucleus states in ab initio approach

Rodkin,

Tchuvil'sky

2021

Preprint

View full text Add to dashboard Cite

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“…This poses a challenge for immediate extension of basis-expansion methods to continuum-state problems like resonances and reactions. The need for synergy of bound-state and continuum computational methods has been recognized by the nuclear-theory community [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Nuclear reactions in artificial traps

Guo¹,

Long²

2022

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

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Coupled-channel two-particle systems bound by a harmonic trap are discussed in the present paper. Under assumption of short-range interactions, the formula that relates the energy levels of such trapped systems to phase shifts and inelasticity of coupled-channel reactions can be obtained in a closed form. The present paper may set some groundworks toward extracting scattering amplitudes of inelastic nuclear reactions from ab initio calculations of discrete levels of many-nucleon systems in a harmonic trap.

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“…It was constructed from the Idaho N3LO interaction by applying an SRG evolution and finally a set of phaseequivalent transformations. The fitting process involved nuclei up to 16 O. Daejeon16 has found applications in the description of nucleon-nucleus scattering [25][26][27][28][29], the spectroscopy of light nuclei in favorable comparisons with the LENPIC NN + NNN interaction [30], sd−shell nuclei as a valence interaction [31], the tetraneutron resonance [32,33], clustering [34] and in the development of artificial neural networks [35]-see also [36] for an overview of applications.…”

Section: Introductionmentioning

confidence: 99%

Daejeon16 interaction with contact-term corrections for heavy nuclear systems

Papakonstantinou¹,

Vary²,

Kim³

2021

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

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The Daejeon16 two-nucleon interaction is employed in many-body approaches based on the mean-field approximation. The perturbative character of Dae-jeon16 is verified by comparing results for 16 O from the Hartree-Fock (HF) approximation and from the no-core shell model and by examining the magnitude of perturbative corrections to the HF energy in light and heavy nuclei. In order to approximately describe energies and radii across the nuclear chart, a phenomenological correction in the form of a two-plus-three-nucleon contact interaction is introduced. With fitted parameters we achieve a very good description of medium-mass nuclei in terms of energy and size and also in terms of the centroid energy of the giant monopole resonance and the dipole polarizability calculated within the random-phase approximation. Our results provide further justification for the use of Daejeon16 augmented with phenomenological corrections as an effective interaction of perturbative character in a variety of applications.

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Resonances in Exotic $^7$He Nucleus within the No-Core Shell Model

Cited by 4 publications

References 27 publications

Detailed study of decay properties of 7He nucleus states in ab initio approach

Detailed study of decay properties of 7He nucleus states in ab initio approach

Nuclear reactions in artificial traps

Daejeon16 interaction with contact-term corrections for heavy nuclear systems

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