A study of Λ hypernuclei within the Skyrme–Hartree–Fock model

Guleria, Neelam; Dhiman, Shashi K.; Shyam, Radhey

doi:10.1016/j.nuclphysa.2012.05.005

Cited by 49 publications

(54 citation statements)

References 100 publications

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“…It is crucial to have better constraints for these parameters in order to have a better understanding of the NS. In a recent work [51] the parameters of a Skyrme model have been tuned to reproduce some experimental data on hypernuclei. It may be important to do similar work with the RMF models so that the hyperon-nucleon coupling constants could be fitted with hypernuclear data.…”

Section: Resultsmentioning

confidence: 99%

Impact of hyperons and antikaons in an extended relativistic mean-field description of neutron stars

Gupta¹,

Arumugam²

2013

Phys. Rev. C

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We study the role of higher order couplings in extended relativistic mean-field models, along with the condensation of antikaons and hyperons, on neutron star properties. Though this approach seems to be better and inclusive, the results are sensitive to the hyperon-nucleon and antikaon-nucleon coupling constants, which are poorly known. Despite this aspect, we find that both the hyperons and the antikaons can play a significant role, even in extended relativistic mean-field models which yield softer equations of state. We find that there is a strong interplay between antikaons and hyperons affecting each other's influence on neutron star properties. We discuss the implications of our results in light of the recently observed pulsar with 1.97 ± 0.04 solar masses.

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Section: Resultsmentioning

confidence: 99%

Impact of hyperons and antikaons in an extended relativistic mean-field description of neutron stars

Gupta¹,

Arumugam²

2013

Phys. Rev. C

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“…The effect of strange particles, such as hyperons, on the nuclear-matter equation of state (EoS) has been studied within the SHF models [3,4]. In these works the existence of hyperons softens the nuclear-matter EoS substantially and, as a consequence, the maximum mass of the neutron star decreases.…”

Section: Introductionmentioning

confidence: 99%

Kaon condensation in neutron stars with Skyrme-Hartree-Fock models

et al. 2014

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We investigate nuclear-matter equations of state in neutron stars with kaon condensation. It is generally known that the existence of kaons in neutron star makes the equation of state soft so that the maximum mass of a neutron star is not likely to be greater than 2.0M , the maximum mass constrained by current observations. With existing Skyrme force model parameters, we calculate nuclear equations of state and check the possibility of kaon condensation in the core of neutron stars. The results show that, even with the kaon condensation, the nuclear equation of state satisfies both the maximum mass and the allowed ranges of mass and radius.

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“…These experimental efforts continue and are intensified, e.g., in several present and future experiments at international facilities like J-PARC, JLab, and FAIR. Hypernuclear structure theory has a rich history of phenomenological models that have accompanied and driven the experiments, most notably, the shell model for p-and sdshell hypernuclei [7,8], cluster models [9-12], various meanfield models [13][14][15][16], or recent Monte Carlo calculations with simplified phenomenological interactions [17,18]. Ab initio calculations based on realistic nucleonic and hyperonic interactions were limited to systems of up to 4 nucleons so far [19][20][21][22].…”

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confidence: 99%

Ab InitioDescription ofp-Shell Hypernuclei

et al. 2014

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We present the first ab initio calculations for p-shell single-Λ hypernuclei. For the solution of the manybaryon problem, we develop two variants of the no-core shell model with explicit Λ and Σ + , Σ 0 , Σ − hyperons including Λ-Σ conversion, optionally supplemented by a similarity renormalization group transformation to accelerate model-space convergence. In addition to state-of-the-art chiral two-and three-nucleon interactions, we use leading-order chiral hyperon-nucleon interactions and a recent meson-exchange hyperon-nucleon interaction. We validate the approach for s-shell hypernuclei and apply it to p-shell hypernuclei, in particular to 7 Λ Li, 9 Λ Be and 13 Λ C. We show that the chiral hyperon-nucleon interactions provide ground-state and excitation energies that generally agree with experiment within the cutoff dependence. At the same time we demonstrate that hypernuclear spectroscopy provides tight constraints on the hyperon-nucleon interactions. PACS numbers: 21.80.+a, 21.60.De, 13.75.Ev, 05.10.Cc Over the past decades, the structure of hypernuclei has been the focus of a number of experimental programs worldwide, providing a wealth of high-precision data on excitation spectra as well as binding energies [1][2][3][4][5][6]. These experimental efforts continue and are intensified, e.g., in several present and future experiments at international facilities like J-PARC, JLab, and FAIR. Hypernuclear structure theory has a rich history of phenomenological models that have accompanied and driven the experiments, most notably, the shell model for p-and sdshell hypernuclei [7,8], cluster models [9-12], various meanfield models [13][14][15][16], or recent Monte Carlo calculations with simplified phenomenological interactions [17,18]. Ab initio calculations based on realistic nucleonic and hyperonic interactions were limited to systems of up to 4 nucleons so far [19][20][21][22]. Nevertheless, these calculations established a direct link between experimental observables and the underlying interactions and helped to elucidate the role of hyperons in matter. Advancing ab initio methods beyond their current limits is highly desirable. It would allow to exploit the wealth of accurate experimental data, e.g., on p-shell hypernuclei, for constraining and improving the underlying interactions and to make predictions for yet unobserved phenomena.There are two main aspects that hindered ab initio calculations for p-shell hypernuclei in the past. Firstly, a prerequisite are accurate ab initio calculations of the non-strange parent nucleus. The approach has to be able to provide converged results for the parent nucleus and the nucleonic Hamiltonian has to yield a good description of the experimental nuclear spectra. In the past few years, ab initio methods using two-nucleon (NN) and three-nucleon (3N) interactions constructed in chiral effective field theory (EFT) succeeded to provide a quantitative description of ground states and spectra of nuclei in the p-shell and beyond [23,24]. This is facilitated by a multitude ...

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A study of Λ hypernuclei within the Skyrme–Hartree–Fock model

Cited by 49 publications

References 100 publications

Impact of hyperons and antikaons in an extended relativistic mean-field description of neutron stars

Impact of hyperons and antikaons in an extended relativistic mean-field description of neutron stars

Kaon condensation in neutron stars with Skyrme-Hartree-Fock models

Ab InitioDescription ofp-Shell Hypernuclei

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