Possible existence of bound nuclei beyond neutron drip lines driven by deformation *

He, Xiao-Tao; Wang, Chen; Zhang, K. Y.; Shen, Chen

doi:10.1088/1674-1137/ac1b99

Cited by 26 publications

(16 citation statements)

References 41 publications

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“…Finally, it is interesting to note that a peninsula of stability is also found in the 100 Z 120 region [47,57] according to the DRHBc theory. It is also noted that some effects might influence the prediction of stability beyond the drip line, such as the triaxial [51] and high-order deformation [57], dynamical correlations [51,58,59], charge-symmetry breaking [60,61], and Coulomb energy corrections [61,62], which deserve more efforts in the future.…”

Section: Resultsmentioning

confidence: 87%

Possible bound nuclei beyond the two-neutron drip line in the $50\leqslant Z \leqslant 70$ region

Pan,

Zhang,

Chong

et al. 2021

Preprint

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The possible bound nuclei beyond the two-neutron drip line in the 50 Z 70 region are investigated by using the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc)with the density functional PC-PK1. Bound nuclei beyond the drip line of 56 Ba, 58 Ce, 62 Sm, 64 Gd and 66 Dy are predicted, forming peninsulas of stability in the nuclear landscape. Near these peninsulas, there are several multi-neutron emitters which are stable against two-neutron emission but unstable against multi-neutron emission. The underlying mechanism is investigated by studying the total energy, Fermi surface, quadrupole deformation and single-neutron spectrum in the canonical basis. It is found that the deformation effect is crucial for the peninsulas of stability, and pairing correlations are also essential in specific cases. The dependence on the deformation evolution for the stability against neutron emissions is discussed.

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Section: Resultsmentioning

confidence: 87%

Possible bound nuclei beyond the two-neutron drip line in the $50\leqslant Z \leqslant 70$ region

Pan,

Zhang,

Chong

et al. 2021

Preprint

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“…The deformation plays a decisive role in the formation of these stability peninsulas, and the pairing correlations and continuum effects also influence them in a self-consistent way [112][113][114].…”

Section: Discussionmentioning

confidence: 99%

“…The predictive power of the DRHBc theory with PC-PK1 for the masses of superheavy nuclei has been shown by comparing with the latest AME2020 data, and an interesting peninsula consisting of bound superheavy nuclei beyond the twoneutron drip line has been predicted [112]. Similar peninsulas of stability have been found in the region of medium heavy nuclei [113], and the effects of higher order deformations such as β 4 and β 6 on this phenomenon have been investigated [114].…”

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confidence: 83%

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Nuclear mass table in deformed relativistic Hartree-Bogoliubov theory in continuum: I. even-even nuclei

Collaboration¹,

Zhang²,

Cheoun³

et al. 2022

Preprint

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Ground-state properties of even-even nuclei with 8 ≤ Z ≤ 120 from the proton drip line to the neutron drip line have been investigated using the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) with the density functional PC-PK1. With the effects of deformation and continuum included simultaneously, 2583 even-even nuclei are predicted to be bound. The calculated binding energies, two-nucleon separation energies, root-mean-square (rms) radii of neutron, proton, matter, and charge distributions, quadrupole deformations, and neutron and proton Fermi surfaces are tabulated and compared with available experimental data. The rms deviation from the 637 mass data is 1.518 MeV, providing one of the best microscopic descriptions for nuclear masses. The drip lines obtained from DRHBc calculations are compared with other calculations, including the spherical relativistic continuum Hartree-Bogoliubov (RCHB) and triaxial relativistic Hartree-Bogoliubov (TRHB) calculations with PC-PK1. The deformation and continuum effects on the limits of the nuclear landscape are discussed. Possible peninsulas consisting of bound nuclei beyond the two-neutron drip line are predicted. The systematics of the two-nucleon separation energies, two-nucleon gaps, rms radii, quadrupole deformations, potential energy curves, neutron densities, neutron mean-field potentials, and pairing energies in the DRHBc calculations are also discussed. In addition, the α decay energies extracted are in good agreement with available data.

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“…In addition, we would like to mention that the calculations performed in this work can also be done with the deformation relativistic Hartree-Bogoliubov (DRHBc) theory [78][79][80][81][82][83][84], in which the scalar potential and densities are expanded in terms of the Legendre polynomials but the time consuming of the DRHBc theory is much heavier than that for MDC-RMF. Very recently, the influence of higher-order deformation on possible bound nuclei beyond the drip line has been investigated in the transfermium region from No (Z = 102) to Ds (Z = 110) by using the DRHBc theory [85] and a nuclear mass table with the DRHBc theory is in progress [86][87][88][89].…”

Section: Discussionmentioning

confidence: 99%

Microscopic study of higher-order deformation effects on the ground states of superheavy nuclei around $^{270}$Hs

Wang,

Sun,

Zhou

2021

Preprint

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We study the effects of higher-order deformations β λ (λ = 4, 6, 8, and 10) on the ground state properties of superheavy nuclei (SHN) near the doubly magic deformed nucleus 270 Hs by using the multidimensionally-constrained (MDC) relativistic mean-field (RMF) model with five effective interactions PC-PK1, PK1, NL3 * , DD-ME2, and PKDD. The doubly magic properties of 270 Hs are featured by the large energy gaps at N = 162 and Z = 108 in the single-particle spectra. By investigating the binding energies and single-particle levels of 270 Hs in multidimensional deformation space, we find that the deformation β6 has the greatest impact on the binding energy among these higher-order deformations and influences the shell gaps considerably. Similar conclusions hold for other SHN near 270 Hs. Our calculations demonstrate that the deformation β6 must be considered when studying SHN by using MDC-RMF.

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Possible existence of bound nuclei beyond neutron drip lines driven by deformation *

Cited by 26 publications

References 41 publications

Possible bound nuclei beyond the two-neutron drip line in the $50\leqslant Z \leqslant 70$ region

Possible bound nuclei beyond the two-neutron drip line in the $50\leqslant Z \leqslant 70$ region

Nuclear mass table in deformed relativistic Hartree-Bogoliubov theory in continuum: I. even-even nuclei

Microscopic study of higher-order deformation effects on the ground states of superheavy nuclei around $^{270}$Hs

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