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Zhang, Zhenhua; Zeng, Jumei; Zhao, En-Guang; Zhou, Shan‐Gui

doi:10.1103/physrevc.83.011304

Cited by 75 publications

(78 citation statements)

References 26 publications

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“…Theoretically, various models have been applied to study the rotational properties of transfermium nuclei. The calculations include (i) cranking approximations of mean-field models such as the macroscopicmicroscopic approach [15][16][17], the Nilsson potential with the particle-number-conserving method [18][19][20], the HartreeFork-Bogoliubov (HFB) approach with the Skyrme force [21,22], the HFB approach with the Gogny force [23,24], and the relativistic Hartree-Bogoliubov approach [25]; (ii) the projected shell model [26][27][28] No and 254 No, no one has explained in detail the mechanism responsible for the significant MOI difference of the two nuclei. Using total Routhian surface (TRS) calculations, now extended to include high-order deformations, we show that the difference can be understood in terms of β 6 that decreases the energies of the νj 15/2 intruder orbitals below the N = 152 deformed shell gap.…”

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confidence: 99%

Understanding the different rotational behaviors of252No and254No

2012

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Total Routhian surface calculations have been performed to investigate rapidly rotating transfermium nuclei, the heaviest nuclei accessible by detailed spectroscopy experiments. The observed fast alignment in 252 No and slow alignment in 254 No are well reproduced by the calculations incorporating high-order deformations. The different rotational behaviors of 252 No and 254 No can be understood for the first time in terms of β 6 deformation that decreases the energies of the νj 15/2 intruder orbitals below the N = 152 gap. Our investigations reveal the importance of high-order deformation in describing not only the multiquasiparticle states but also the rotational spectra, both providing probes of the single-particle structure concerning the expected doubly magic superheavy nuclei.DOI: 10.1103/PhysRevC.86.011301 PACS number(s): 21.10. Re, 21.60.Cs, 23.20.Lv, 27.90.+b Together with the exploration of nuclei far away from the stability line using radioactive nuclear beams, the synthesis of superheavy nuclei towards the predicted "island of stability" by fusion reactions is the focus of current research on atomic nuclei [1,2]. The occurrence of superheavy nuclei is due to the quantum shell effect (see, e.g., Ref. [3]) that overcomes the strong Coulomb repulsion between the large number of protons. The shell effect peaks at the expected doubly magic nucleus next after 208 Pb, the center of the stability island. Unfortunately, various theories give rise to different magic numbers, and available experiments have not been able to confirm or exclude any of them. Nevertheless, one can obtain single-particle information that is intimately related to the shell structure of superheavy nuclei from transfermium nuclei where γ -ray spectroscopy has been accessible for experiments [4,5].Transfermium nuclei have been found to be deformed. For example, β 2 ≈ 0.27 has been derived for 254 No from the measured ground-state band [6]. The observation of K isomers with highly hindered decays in 254 No [7][8][9] points to an axially symmetric shape for the nucleus. The deformation can bring the single-particle levels from the next shell across the predicted closure down to the Fermi surface. They play an active role in both nuclear noncollective and collective motions that in turn can serve as probes of the single-particle structure. For example, the observed K π = 3 + state formed by broken-pair excitation in 254 No is of special interest [7]. This is because the π 1/2 − [521] orbital occupied by one unpaired nucleon stems from the spherical orbital 2f 5/2 whose position relative to the spin-orbit partner 2f 7/2 determines whether Z = 114 is a magic number for the "island of stability." On the other hand, high-j intruder orbitals sensitively respond to the Coriolis force during collective rotation. The observation of upbending or backbending phenomena is usually associated with the alignment of high-j intruder orbitals. The spectroscopy experiments on transfermium nuclei provide a * hlliu@mail.xjtu.edu.cn testing ground for...

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Understanding the different rotational behaviors of252No and254No

2012

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“…Other unobserved low-lying bands of 2-quansiparticles in 172 Tm are predicted. The CSM-PNC method is also used to study the recently observed high-spin rotational bands in odd-A nuclei 247,249 Cm and 249 Cf [41]. The relativistic consistent angular-momentum projected shell model (ReCAPS) [42,43] is used in the study of the structure and electromagnetic transitions of the low-lying states in the N = Z nucleus 52 Fe [44].…”

Section: Structure and Reactions Of Exotic Nucleimentioning

confidence: 99%

Recent progress in theoretical nuclear physics related to large-scale scientific facilities

Zhao

Wang

2011

Chin. Sci. Bull.

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“…The Nilsson parameters (κ, µ) which are optimized to reproduce the experimental level schemes for heavy nuclei around A = 250 mass region in Refs. [6,7] are used. The axially symmetric deformation parameters ε 2,4,6 are taken from Refs.…”

Section: Theoretical Methodsmentioning

confidence: 99%

High-K Isomers in Light Superheavy Nuclei by PNC-CSM method

2018

EPJ Web Conf.

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Abstract. The high-K isomeric states in light superheavy nuclei around A = 250 mass region are investigated by the Cranked Shell Model (CSM) with pairing treated by a Particle-Number Conserving (PNC) method. With including the higher-order deformation ε 6 , both of the high−K multi-particle state energies and the rotational bands in 254 No and N = 150 isotone are reproduced well. The isomeric state energies and the microscopic mechanism of kinematic moment of inertia variations versus rotational frequency are discussed. The irregularity of the two-neutron K π = 8 − state band at ω ≈ 0.17 in 252 No is caused by the configuration mixing with the two-proton K π = 8 − band. .

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Particle-number conserving analysis of rotational bands in247,249Cm and249

Cited by 75 publications

References 26 publications

Understanding the different rotational behaviors of252No and254No

Understanding the different rotational behaviors of252No and254No

Recent progress in theoretical nuclear physics related to large-scale scientific facilities

High-K Isomers in Light Superheavy Nuclei by PNC-CSM method

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