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Малов, А. И.

doi:10.1023/a:1012829611601

Cited by 3 publications

(5 citation statements)

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“…Moreover, a direct comparison between experimental and theoretical single-particle states in spherical nuclei should include the particle-vibration coupling, which can modify the single-particle energies considerably [27]. The modification of the quasiparticle states by particle-vibration coupling is weaker in deformed nuclei [84][85][86].…”

Section: Quasi-particle Statesmentioning

confidence: 99%

“…It has been demonstrated for spherical nuclei that the particlevibration coupling brings the average level density in closer agreement with experiment [27], which means m * (k F )/m closer to one. In a similar way, the particle-vibration coupling leads to a compression of the quasi-particle spectra in deformed nuclei [86]. The surface vibrations are less collective in deformed nuclei than in spherical ones because they are more fragmented [84,91].…”

Section: B Particle-vibration Coupling and Other Effectsmentioning

confidence: 99%

“…Calculations within the quasiparticle-phonon model [92,93] indicate that in the A ∼ 250 mass region the lowest states have mainly quasi-particle nature and the corrections to their energies due to particle-vibration coupling are typically at the level of 150 keV or less. The states above ≈ 700 keV contain very large vibrational admixtures [86] and thus experimental states above this energy should not be compared with the pure quasiparticle states obtained in the CRHB calculations.…”

Section: B Particle-vibration Coupling and Other Effectsmentioning

confidence: 99%

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Cranked relativistic Hartree-Bogoliubov theory: Probing the gateway to superheavy nuclei

et al. 2003

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A systematic investigation of the yrast superdeformed (SD) rotational bands in even-even nuclei of the A ∼ 190 mass region has been performed within the framework of the cranked relativistic Hartree-Bogoliubov theory. The particle-hole channel of this theory is treated fully relativistically, while a finite range two-body force of Gogny type is used in the particle-particle (pairing) channel. Using the well established parameter sets NL1 for the Lagrangian and D1S for the Gogny force, very good description of experimental data is obtained with no adjustable parameters.Despite the fact that superdeformation at high spin has been studied experimentally and theoretically for one and half decade a number of theoretical questions such as, for example, the underlying mechanism of identical bands and the role of pairing correlations in the regime of weak pairing in rotating nuclei, remains still not fully resolved and further development of theoretical tools is definitely required. During the last decade the relativistic mean field (RMF) theory 1 became a standard microscopic tool of nuclear structure studies. Systematic investigation of SD rotating nuclei in the regime of weak pairing correlations in the A ∼ 150 2,3,4,5 and A ∼ 60 (see Ref.6 and references therein) mass regions revealed that cranked relativistic mean field (CRMF) theory 7,3 , in which pairing correlations are neglected, provides an astonishingly accurate description of the properties of SD bands, such as moments of inertia, transition quadrupole moments Q t , effective alignments i ef f , singleparticle properties at superdeformation etc. In particular we have to keep in mind that this theory has only seven free parameters fitted to the properties of few spherical nuclei 8 . One should clearly recognize that the neglect of pairing correlations used in CRMF theory is an approximation because pairing correlations being weak are still present even at the highest rotational frequencies. Moreover, the rotational properties of nuclei at low and medium spin are strongly affected by pairing correlations. In order to describe such properties within the relativistic framework, cranked relativistic Hartree-Bogoliubov theory has been developed 9,10,11 . This theory is an extension of CRMF theory to the description of pair- ing correlations in the rotating frame. In this theory the particle-hole channel is treated fully relativistically on the Hartree level, while the particle-particle channel is approximated by the best currently available non-relativistic interaction: the pairing part of the Gogny force. The use of this force has a clear advantage since it provides both an automatic cutoff of high-momentum components and, as follows from non-relativistic studies, an excellent description of pairing properties in finite nuclei. An additional feature of CRHB theory is that approximate particle number projection is performed by means of the Lipkin-Nogami method (further APNP(LN)) 12,13,14 . The comparative study of pairing and rotational properties in the rare eart...

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Section: Quasi-particle Statesmentioning

confidence: 99%

Section: B Particle-vibration Coupling and Other Effectsmentioning

confidence: 99%

Section: B Particle-vibration Coupling and Other Effectsmentioning

confidence: 99%

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Cranked relativistic Hartree-Bogoliubov theory: Probing the gateway to superheavy nuclei

et al. 2003

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“…Neutron [29]. The surface vibrations are less collective in deformed nuclei than in spherical ones because they are more fragmented [30,31].…”

Section: Proton Statesmentioning

confidence: 99%

“…The symbols 'N/A' (not accessible) are for the deformed states which typically increase their energy with increasing deformation and thus are not likely to be seen experimentally. deformed nuclei [29]. The surface vibrations are less collective in deformed nuclei than in spherical ones because they are more fragmented [30,31].…”

Section: Quasiparticle Spectra In Odd-mass a ∼ 250 Nucleimentioning

confidence: 99%

Probing The Gateway To Superheavy Nuclei In Cranked Relativistic Hartree-Bogoliubov Theory

Afanasjev¹,

Khoo²,

Frauendorf³

et al. 2003

AIP Conference Proceedings

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The cranked relativistic Hartree+Bogoliubov theory has been applied for a systematic study of the nuclei around ¤ ¥ ¦ No, the heaviest nuclei for which detailed spectroscopic data are available. The deformation, rotational response, pairing correlations, quasi-particle and other properties of these nuclei have been studied with different relativistic mean field (RMF) parametrizations. For the first time, the quasi-particle spectra of odd deformed nuclei have been calculated in a fully selfconsistent way within the framework of the RMF theory. The energies of the spherical subshells, from which active deformed states of these nuclei emerge, are described with an accuracy better than 0.5 MeV for most of the subshells with the NL1 and NL3 parametrizations. However, for a few subshells the discrepancy reach 0.7-1.0 MeV. The implications of these results for the study of superheavy nuclei are discussed.

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Vendian Hydrogeochemistry of the Siberian Platform

Новиков

Черных

Константинова

et al. 2021

Russian Geology and Geophysics

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—The Vendian deposits of the Siberian Platform are represented by four regional horizons (from bottom to top): Nepa, Vilyuchan, Tira, and Danilovka. The TDS of brines in the Nepa and Vilyuchan horizons varies from 170.3 to 470.1 g/L, and the TDS in the overlying Tira and Danilovka horizons, from 84.6 to 583.1 g/L. Brines of Cl Na, Cl Na–Ca, Cl Ca–Na, Cl Ca, and Cl Ca–Mg types have been identified. The pH values of the brines vary from 3.0 to 7.0; acidic and weakly acidic brines (pH = 3.0–5.5) prevail. The redox potential Eh varies from –440 mV (highly reducing conditions) to +130 mV (oxidizing conditions), averaging –176 mV. Areal regional hydrogeochemical zoning is controlled by the outer (on the periphery of the Siberian Platform, where infiltration of meteoric waters took place) and inner feeding areas. The outer feeding areas bear infiltrogenic brines of different ages (group I), mostly of Cl Na composition. They are characterized by TDS ≤ 280 g/L, rNa/rCl ≤ 1.55, Cl/Br ≤ 2512, and average Ca/Cl = 0.3. The average values of the integrated brine metamorphization index S (according to S.L. Shvartsev) range from 50 to 200. In the intraplatform feeding areas, there are several phases of brines that underwent gravitational sinking into the Vendian horizons in the periods when Cambrian salt-bearing basins existed on the platform. These brines were metamorphosed during filtration along the fracture and fault zones. The intrusion of traps in the late Permian–early Triassic was accompanied by hydrothermal activity. The waters of the enclosing Cambrian dolomite horizons were heated to 800–1000 °C; their subsequent interaction with carbonate rocks and evaporites (in particular, chlorides) resulted in extrastrong saturated brines. These brines were also subjected to gravitational sinking into the Vendian reservoirs, which was the main cause of the inverse vertical hydrogeochemical zoning in the hydrogeologic subsalt formation. The brine metamorphism processes and temperature changes in the rock horizons during the intrusion of traps and their subsequent cooling led to a significant alteration of the enclosing rocks under interaction with brines and to salinization of the reservoirs, an increase in the total salinity of the brines, and catagenetic changes in their composition. The brines closest to the maximum saturation with halite were found in reservoir zones with the highest salinization and near faults and boundaries of intrusive bodies. During the pre-Vilyuchan, pre-Nepa, pre-Tira, and pre-Danilovka sedimentation breaks, infiltrogenic waters penetrated into the Vendian sediments. Geochemically, the sedimentogenic, infiltrogenic, and metamorphic strong brines (group II) have a predominantly Cl Ca or Cl Ca–Mg composition with TDS > 350 g/L. They are characterized by low rNa/rCl ratios (on average, 0.3), Cl/Br ≤ 100, high Ca/Cl values (on average, 0.4), and S > 250.

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Cited by 3 publications

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Cranked relativistic Hartree-Bogoliubov theory: Probing the gateway to superheavy nuclei

Cranked relativistic Hartree-Bogoliubov theory: Probing the gateway to superheavy nuclei

Probing The Gateway To Superheavy Nuclei In Cranked Relativistic Hartree-Bogoliubov Theory

Vendian Hydrogeochemistry of the Siberian Platform

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