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Title: Pseudospin symmetry and structure of nuclei with Z {>=} 100

Abstract

In the framework of the relativistic mean-field approach, a pseudospin dependence of the residual forces in nuclei is considered. It is shown that this dependence is relatively weak. As a consequence, a pseudospin dependence of the particle-core coupling is weak as well. This leads to a small splitting of the pseudospin doublets produced by a vector coupling of an odd particle pseudospin and a pseudoorbital momentum of the core. Some possibilities for experimental investigation of the manifestations of the pseudospin symmetry in the spectra of odd nuclei with Z {>=} 100 are indicated.

Authors:
;  [1]
  1. Joint Institute for Nuclear Research (Russian Federation), E-mail: Voronov@theor.jinr.ru
Publication Date:
OSTI Identifier:
21075883
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 70; Journal Issue: 5; Other Information: DOI: 10.1134/S106377880705002X; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COUPLING; MEAN-FIELD THEORY; PARTICLES; RELATIVISTIC RANGE; SPECTRA; SYMMETRY; TRANSACTINIDE ELEMENTS; VECTORS

Citation Formats

Jolos, R. V., E-mail: jolos@theor.jinr.ru, and Voronov, V. V. Pseudospin symmetry and structure of nuclei with Z {>=} 100. United States: N. p., 2007. Web. doi:10.1134/S106377880705002X.
Jolos, R. V., E-mail: jolos@theor.jinr.ru, & Voronov, V. V. Pseudospin symmetry and structure of nuclei with Z {>=} 100. United States. doi:10.1134/S106377880705002X.
Jolos, R. V., E-mail: jolos@theor.jinr.ru, and Voronov, V. V. Tue . "Pseudospin symmetry and structure of nuclei with Z {>=} 100". United States. doi:10.1134/S106377880705002X.
@article{osti_21075883,
title = {Pseudospin symmetry and structure of nuclei with Z {>=} 100},
author = {Jolos, R. V., E-mail: jolos@theor.jinr.ru and Voronov, V. V.},
abstractNote = {In the framework of the relativistic mean-field approach, a pseudospin dependence of the residual forces in nuclei is considered. It is shown that this dependence is relatively weak. As a consequence, a pseudospin dependence of the particle-core coupling is weak as well. This leads to a small splitting of the pseudospin doublets produced by a vector coupling of an odd particle pseudospin and a pseudoorbital momentum of the core. Some possibilities for experimental investigation of the manifestations of the pseudospin symmetry in the spectra of odd nuclei with Z {>=} 100 are indicated.},
doi = {10.1134/S106377880705002X},
journal = {Physics of Atomic Nuclei},
number = 5,
volume = 70,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • Nuclei with equal number of protons and neutrons have many interesting properties connected with high probability of alpha-particle correlations. However, no such nuclei heavier than 100Sn were identified until now. Meanwhile, they can demonstrate some new unusual features, e.g. the existing of alpha-particle skin, the appearance of a new domain of cluster radioactivity and the most aspiring one, alpha-particle Bose condensate. Current situation in the field and possible experimental approaches are discussed.
  • We briefly review the evidence that pseudospin symmetry is an SU(2) symmetry of the Dirac Hamiltonian.
  • The properties of alternating parity bands in heavy nuclei {sup 234}Th, {sup 239-242}U, {sup 241-245}Pu, {sup 243-248}Cm, {sup 245-250}Cf, {sup 248-251}Fm, {sup 249-254}No, {sup 253-256}Rf, and {sup 258}Sg are analyzed within the dinuclearsystem model. The model is based on the assumption that the cluster-type shapes are produced by the motion of the nuclear system in the mass-asymmetry coordinate. The energies of the low-lying states whose parity is opposite to the parity of the ground state are predicted for the first time.
  • Nine superdeformed bands in several nuclei of the mass-190 region all have transitions of the same or equivalent energies to within an average of about 1 keV--almost identical. Furthermore, it is found that transitions of the same energy do not always connect levels of the same spin, indicating noncollective angular momentum alignments that are all very nearly integers (0, 1{h bar}, or 2{h bar}). Possible explanations involving pseudospin are discussed.
  • Recently it has been shown that pseudospin symmetry has its origins in a relativistic symmetry of the Dirac Hamiltonian. Using this symmetry we relate single-nucleon relativistic magnetic moments of states in a pseudospin doublet to the relativistic magnetic dipole transitions between the states in the doublet, and we relate single-nucleon relativistic Gamow-Teller transitions within states in the doublet. We apply these relationships to the Gamow-Teller transitions from {sup 39}Ca to its mirror nucleus {sup 39}K. {copyright} {ital 1999} {ital The American Physical Society}