Clusterization and deformation of multi-
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 hypernuclei within a relativistic mean-field model

Tanimura, Yusuke

doi:10.1103/physrevc.99.034324

Cited by 15 publications

(11 citation statements)

References 72 publications

(165 reference statements)

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“…This observation is the same as that obtained by -0. the RMF model in Ref. [24]. However, for 4Λ and 6Λ hypernuclei, the opposite impurity effects can be seen, namely the deformations of the hypernuclei become larger than those of the core nuclei.…”

Section: Resultsmentioning

confidence: 94%

“…Of particular interest is the fact that the addition of Λ hyperons can lead to the appearance of the so-called impurity effect [2,7], since the hyperon(s) can enter deeply into the center of a hypernucleus regardless of the restriction of the Pauli exclusion principle, and thus can be used as a good probe to study the nuclear environment. The impurity effects of single-Λ hypernuclei have been investigated extensively in the past decades, such as the shrinkage effect [22][23][24], the modification of the drip lines [25,26], and the modification of the deformation [27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, the impurity effects of multi Λ hyperons on the deformations in the hyperisotope chains 8+n nΛ Be (n = 2, 4), 20+n nΛ Ne (n = 2,4,8), and 28+n nΛ Si (n = 2,4,8) have been studied using the relativistic mean field (RMF) theory in Ref. [24]. It was pointed out that in the Ne hyperisotopes, the deformation is slightly reduced by the additional Λ hyperons, whereas it is significantly reduced or even disappears in the Si hyperisotopes.…”

Section: Introductionmentioning

confidence: 99%

“…The aforementioned work in Ref. [24] studied only a few nuclei and did not address the impurity effects caused by 6 Λ hyperons. Therefore, further studies on the impurity effect of n = 2, 4, 6, 8 Λ hyperons on the properties of even-even nuclei ranging from 8 Be to 40 Ca are carried out in this work.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to the RMF model adopted in Ref. [24], we will employ the deformed Skyrme-Hartree-Fock (SHF) approach [45][46][47], which is one of the widely used models for hypernuclei [26,43,48].…”

Section: Introductionmentioning

confidence: 99%

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Effects of $\bm\la$ hyperons on the deformations of even-even nuclei

Chen,

Zhou

et al. 2021

Preprint

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The deformations of multi-Λ hypernuclei corresponding to even-even core nuclei ranging from 8 Be to 40 Ca with 2, 4, 6, and 8 hyperons are studied in the framework of the deformed Skyrme-Hartree-Fock approach. It is found that the deformations are reduced when adding 2 or 8 Λ hyperons, but enhanced when adding 4 or 6 Λ hyperons. These differences are attributed to the fact that Λ hyperons are filled gradually into the three deformed p orbits, of which the [110]1/2 − orbit is prolately deformed and the degenerate [101]1/2 − and [101]3/2 − orbits are oblately deformed.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of $\bm\la$ hyperons on the deformations of even-even nuclei

Chen,

Zhou

et al. 2021

Preprint

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Toroidal states in 28Si with covariant density functional theory in 3D lattice space

et al. 2020

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The toroidal states in 28 Si with spin extending to extremely high are investigated with the cranking covariant density functional theory on a 3D lattice. Thirteen toroidal states with spin I ranging from 0 to 56 are obtained, and their stabilities against particle emission are studied by analyzing the density distributions and potentials. The excitation energies of the toroidal states at I = 28, 36, and 44 reasonably reproduce the observed three resonances extracted from the seven-α de-excitation of 28 Si. The possible existence of α clustering in these toroidal states is discussed based on α-localization function.Most nuclei in their ground states are spherical or ellipsoidal [1]. Wheeler suggested that very heavy nuclei may have toroidal shapes due to the large Coulomb energies [2].Pioneering works along this idea have been done by Wong [3][4][5]. Based on the toroidal potential in radially displaced harmonic-oscillator model [3,4], it was found that although the toroidal states in liquid-drop model are unstable against sausage deformations, the nuclear shell effects may counterbalance with this instability [3,4]. Later on, Wong predicted that the toroidal states could be stabilized with a sufficiently high angular momentum by introducing an effective "rotation" about the symmetry axis to the toroidal states [5]. Recent investigation on shells in a toroidal nucleus in the intermediate-mass region with the toroidal potential can be found in Ref. [6].The microscopic and self-consistent nuclear energy density functional theories (DFTs) [7][8][9][10] have also been used to investigate the toroidal states in both superheavy [11][12][13][14] and light nuclei [15][16][17][18][19][20]. In particular, for the high-spin toroidal states, a toroidal state with an angular momentum of 60 along the symmetry axis in 40 Ca has been obtained with the cranking Skyrme DFT [16]. Similar high-spin toroidal states in other nuclei with 28 ≤ A ≤ 52 were also investigated in Refs. [17][18][19][20].The angular momenta of the high-spin toroidal states are not from the collective rotation about the symmetry axis, but are generated by nucleon alignments [16,17]. The alignments of nucleons violate the time-reversal symmetries and, thus, induce strong currents [16], which requires a proper treatment of the time-odd fields in the framework of DFTs. In addition, some toroidal states may contain single particles in unbound states [16,18,20]. It is therefore important to examine the stability of the toroidal states against the nucleon emission.To treat the time-odd fields and nucleon emission properly, a covariant DFT (CDFT) calculation in three-dimensional (3D) lattice space is preferred. Due to the Lorentz invariance, the CDFT provides a self-consistent treatment of the time-odd fields; the time-odd fields share the same coupling constants as the time-even ones [21]. Working in 3D lattice space makes it suitable to examine the nuclear stability against nucleon emission. Fortunately, the CDFT in 3D lattice space is available now [22][23][24] af...

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