14 research outputs found
Overlap Functions in Correlation Methods and Nucleon Removal Reactions from 16O and 40Ca
No full text
Variation after particle-number projection for the Hartree-Fock-Bogoliubov method with the Skyrme energy density functional
No full textVariation after particle-number restoration is incorporated for the first time into the Hartree-Fock-Bogoliubov (HFB) framework employing the Skyrme energy density functional with zero-range pairing. The resulting projected HFB equations can be expressed in terms of the local gauge-angle-dependent densities. Results of projected calculations are compared with those obtained within the Lipkin-Nogami method in the standard version and with the Lipkin-Nogami method followed by exact particle-number projection.Physics, NuclearSCI(E)0ARTICLE1null7
Two-body density matrix for closed shell nuclei
No full textThe two-body density matrix for and within the
Low-order approximation of the Jastrow correlation method is considered.
Closed analytical expressions for the two-body density matrix, the center of
mass and relative local densities and momentum distributions are presented.
The effects of the short-range correlations on the two-body nuclear
characteristics are investigated
Modified MSIS chamber as a novel gas–liquid separator coupled with the photochemical vapor generation of trace mercury with MP-AES detection
No full textNew hyphenation of continuous flow photochemical vapor generator (PVG) to modified multimode sample introduction system (MSIS) used as gas-liquid separator and microwave plasma atomic emission spectrometry (MP-AES) was proposed for analysis of trace mercury. The widened MSIS bottom inlet contributes to the increase of the Hg0 mass transfer in the gas-liquid separator allowing the mercury determination by MP-AES. After optimizing the PVG reactor conditions and MP-AES instrument parameters a limit of detection (LOD) of 0.25 ppb was obtained for Hg2+. The applicability of the PVG-MSIS-MP-AES method was subsequently demonstrated for trace mercury analysis in two soil CRMs - ERM-CC135a (Contaminated Brickworks soil) and CRM005 (Sewage Amended soil).This study is financed by the European Union-NextGenerationEU, through the National Recovery and Resilience Plan of the Republic of Bulgaria, project № BG-RRP-2.004-0001-C01
Shell structure beyond the proton drip line studied via proton emission from deformed 141Ho
No full textFine structure in proton emission from the 7/2−[523] ground state and from the 1/2+[411] isomer in deformed
nucleus 141Ho was studied by means of fusion-evaporation reactions and digital signal processing.
Proton transitions to the first excited 2+ state in 140Dy, with the branching ratio of Igs
p (2+) = 0.9 ± 0.2%
and Imp
(2+) = 1.7 ± 0.5%, were observed. The data are analyzed within the non-adiabatic weak coupling
model assuming a large quadrupole deformation of the daughter nucleus 140Dy as predicted by
the self-consistent theory. Implications of this result on coexistence effects around N = 74 are discussed.
Significant modifications of the proton shell structure when going from the valley of beta stability to the
proton drip line are discussed in terms of self-consistent theory involving the two-body tensor interaction
Deformed coordinate-space Hartree-Fock-Bogoliubov approach to weakly bound nuclei and large deformations
No full textThe coordinate-space formulation of the Hartree-Fock-Bogoliubov (HFB) method enables the self-consistent treatment of mean field and pairing in weakly bound systems whose properties are affected by the particle continuum space. Of particular interest are neutron-rich, deformed drip-line nuclei, which can exhibit novel properties associated with neutron skin. To describe such systems theoretically, we developed an accurate two-dimensional lattice Skyrme-HFB solver HFB-AX based on basis (or B)-splines. Compared to previous implementations, ours incorporated a number of improvements aimed at boosting the solver's performance. These include the explicit imposition of axiality and space inversion, use of the modified Broyden method to solve self-consistent equations, and a partial parallelization of the code. HFB-AX has been compared with other HFB codes, both spherical and deformed, and the accuracy of the B-spline expansion was tested by employing the multiresolution wavelet method. Illustrative calculations are carried out for stable and weakly bound nuclei at spherical and very deformed shapes, including constrained fission pathways. In addition to providing new physics insights, HFB-AX can serve as a useful tool to assess the reliability and applicability of coordinate-space and configuration-space HFB frameworks, both existing and in development.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000262248100014&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, NuclearSCI(E)36ARTICLE6null7
