Configuration mixing in low-lying spectra of carbon hypernuclei

Xia, Haojie; Mei, Hua; Yao, J. M.

doi:10.1007/s11433-017-9048-2

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…It has been found that the low-lying positive-parity states of eveneven-one hypernuclei can be well described with the single configuration [ A−1 Z(I + )⊗Λs 1/2 ] J . In contrast, there is a large configuration mixing between the two components [ A−1 Z(I + )⊗Λp 1/2 ] J and [ A−1 Z(I ±2 + )⊗Λp 3/2 ] J in the hypernuclear 1/2 − 1 , 3/2 − 1 states, as illustrated in both samarium [25] and carbon [27] hypernuclei. The mixing weight increases as the collective correlation of nuclear core becomes stronger.…”

Section: Introductionmentioning

confidence: 99%

“…The mixing weight increases as the collective correlation of nuclear core becomes stronger. Based on the nature of these two states, it was suggested that the spin-orbit splitting size of p Λ hyperon state might be overestimated using the data of 13 Λ C. Moreover, 15 Λ C was suggested to be the best candidate among the carbon hypernuclei to study the spin-orbit splitting of p Λ hyperon state [27].…”

Section: Introductionmentioning

confidence: 99%

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Beyond mean-field approach for pear-shaped hypernuclei

Xia

Mei

et al. 2018

Sci. China Phys. Mech. Astron.

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We develop both relativistic mean field and beyond approaches for hypernuclei with possible quadrupole-octupole deformation or pear-like shapes based on relativistic point-coupling energy density functionals. The symmetries broken in the mean-field states are recovered with parity, particle-number and angular momentum projections. We take 21 Λ Ne as an example to illustrate the method, where the Λ hyperon is put on one of the two lowest-energy orbits (labeled as Λs, Λp), respectively. We find that the Λ hyperon in both cases disfavors the formation of a reflectionasymmetric molecular-like 16 O+α structure in 20 Ne, which is consistent with the Nilsson diagram for the hyperon in (β2, β3) deformation plane. In particular, we show that the negative-parity states with the configuration 20 Ne(K π = 0 − ) ⊗ Λs are close in energy to those with the configuration 20 Ne(K π = 0 + ) ⊗ Λp, even though they have very different structures. The Λs (Λp) becomes more and more concentrated around the bottom (top) of the "pear" with the increase of octupole deformation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beyond mean-field approach for pear-shaped hypernuclei

Xia

Mei

et al. 2018

Sci. China Phys. Mech. Astron.

Self Cite

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“…The excitation energies E x (in unit of MeV) of the lowest 1/2 − and 3/2 − states and their energy splittings in carbon hypernuclei. Taken from Ref [32]…”

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confidence: 99%

Relativistic mean-field and beyond approaches for deformed hypernuclei

Yao

Mei

Hagino

et al. 2019

AIP Conference Proceedings

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We report the recent progress in relativistic mean-field (RMF) and beyond approaches for the low-energy structure of deformed hypernuclei. We show that the Λ hyperon with orbital angular momentum = 0 (or > 1) generally reduces (enhances) nuclear quadrupole collectivity. The beyond mean-field studies of hypernuclear low-lying states demonstrate that there is generally a large configuration mixing between the two components [ A−1 Z(I + ) ⊗ Λp 1/2 ] J and [ A−1 Z(I ± 2 + ) ⊗ Λp 3/2 ] J in the hypernuclear 1/2 − 1 , 3/2 − 1 states. The mixing weight increases as the collective correlation of nuclear core becomes stronger. Finally, we show how the energies of hypernuclear low-lying states are sensitive to parameters in the effective NΛ interaction, the uncertainty of which has a large impact on the predicted maximal mass of neutron stars.

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Moments of inertia of neutron stars in relativistic mean field theory: The role of the isovector scalar channel

Qian

Xin

Sun

2018

Sci. China Phys. Mech. Astron.

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With the inclusion of the isovector scalar channel in the meson-nucleon couplings, taking DD-MEδ as an effective interaction, the moments of inertia of neutron stars possessing various stellar masses are studied within the density dependent relativistic mean field (RMF) theory. The isovector scalar channel contributes to the softening of the neutron-star matter equation of state (EOS) and therefore the reduction of the maximum mass and radius of neutron stars. Smaller values of the total moment of inertia I and the crustal moment of inertia ∆I are then obtained in DD-MEδ via numerical procedure in comparison with those in other selected RMF functionals. In addition, the involvement of the isovector scalar channel lowers the thickness of the neutron star crust and its mass fraction as well. The sensitivity to both the crustal mass and stellar radius causes the crustal moment of inertia to be more obviously reduced than the total one, eventually leading to a suppression on the fraction of crustal moment of inertia ∆I/I in DD-MEδ. The results indicate the crustal moment of inertia as a more sensitive probe of the neutron-star matter EOS than the total one, and demonstrate that the isovector scalar meson-nucleon couplings in the RMF theory could exert influence over the physics of pulsar glitches. neutron star, moment of inertia, relativistic mean field theory, isovector scalar channel PACS number(s): 21.60.Jz, 26.60.-c, 26.60.Kp, 26.60.Gj, 97.60.Gb, 97.10.Kc Citation: Qian Z, Xing R Y and Sun B Y, Moments of inertia of neutron stars in relativistic mean field theory: the role of the isovector scalar channel, Sci.

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Configuration mixing in low-lying spectra of carbon hypernuclei

Cited by 8 publications

References 25 publications

Beyond mean-field approach for pear-shaped hypernuclei

Beyond mean-field approach for pear-shaped hypernuclei

Relativistic mean-field and beyond approaches for deformed hypernuclei

Moments of inertia of neutron stars in relativistic mean field theory: The role of the isovector scalar channel

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