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Title: Negative parity states and some electromagnetic transition properties of even-odd erbium isotopes

Abstract

The negative parity states and some electromagnetic transition properties of even-odd erbium isotopes ({sup 159,161,163,165}Er) were studied within the framework of the interacting boson-fermion model. The single fermion is assumed to be in one of the lh{sub 9/2},3p{sub 3/2},2f{sub 5/2}, and 3p{sub 1/2} single-particle orbits. It was found that the calculated negative parity state energy spectra of the even-odd erbium isotopes agree quite well with the experimental data. The B(E2) values were also calculated and compared with the experimental data.

Authors:
;  [1]
  1. Kirikkale University, Faculty of Art and Science, Kirikkale (Turkey)
Publication Date:
OSTI Identifier:
20995122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.75.034309; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; ERBIUM 159; ERBIUM 161; ERBIUM 163; ERBIUM 165; FERMIONS; INTERACTING BOSON MODEL; ORBITS; PARITY; PARTICLES; SPECTRA

Citation Formats

Yazar, Harun Resit, and Uluer, Ihsan. Negative parity states and some electromagnetic transition properties of even-odd erbium isotopes. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.034309.
Yazar, Harun Resit, & Uluer, Ihsan. Negative parity states and some electromagnetic transition properties of even-odd erbium isotopes. United States. doi:10.1103/PHYSREVC.75.034309.
Yazar, Harun Resit, and Uluer, Ihsan. Thu . "Negative parity states and some electromagnetic transition properties of even-odd erbium isotopes". United States. doi:10.1103/PHYSREVC.75.034309.
@article{osti_20995122,
title = {Negative parity states and some electromagnetic transition properties of even-odd erbium isotopes},
author = {Yazar, Harun Resit and Uluer, Ihsan},
abstractNote = {The negative parity states and some electromagnetic transition properties of even-odd erbium isotopes ({sup 159,161,163,165}Er) were studied within the framework of the interacting boson-fermion model. The single fermion is assumed to be in one of the lh{sub 9/2},3p{sub 3/2},2f{sub 5/2}, and 3p{sub 1/2} single-particle orbits. It was found that the calculated negative parity state energy spectra of the even-odd erbium isotopes agree quite well with the experimental data. The B(E2) values were also calculated and compared with the experimental data.},
doi = {10.1103/PHYSREVC.75.034309},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}
  • The positive-parity low-spin states of even-odd Europium isotopes ({sup 151-155}Eu) were studied within the framework of the interacting boson-fermion model. The calculated positive low-spin state energy spectra of the odd Eu isotope were found to agree quite well with the experimental data. The B(E2) values were also calculated and it was found that the calculated positive-parity low-spin state energy spectra of the odd-A Eu isotopes agree quite well with the experimental data.
  • The negative-parity energy levels of the even-odd Yb isotopes, {sup 163}Yb, {sup 165}Yb, {sup 169}Yb, {sup 171}Yb, and {sup 173}Yb, are studied systematically within the framework of the extended interacting-boson-fermion-approximation (IBFA) model in which one odd fermion is couplied with a boson core. The boson core is described with the IBA model but allowing one boson to break into a quasifermion pair. The odd fermion is assumed to be in one of the {ital f}{sub 7/2} and {ital p}{sub 3/2} single-particle orbitals while the fermion pair is allowed to occupy the single-particle orbit {ital i}{sub 13/2}. It was found thatmore » the negative-parity energy levels of these even-odd Yb isotopes and the values of transition quadrupole moments for the ground-state rotational band of {sup 173}Yb can be reproduced in fairly good agreement with the observed data.« less
  • The reorientation effect in Coulomb excitation has been used to measure in the static quadrupole moments Q+' of 2/sup +prime/ ..gamma..-vibrational states; and the branching ratio B/sub ..gamma../ for the decay of the 2/sup +prime/ state to the 0/sup +/ ground state and the first 2/sup +/ state. Both particle-..gamma.. coincidence and particle spectroscopy experiments were carried out to extract these quantities, using 12.5 MeV ..cap alpha.. and 48 MeV /sup 16/O beams with enriched targets. The evaluation was based on the semiclassical Winther-deBoer code and corrected for quantum mechanical effects. The measured values of Q+' agree well with themore » predictions of the rotation-vibration model, asymmetric rotor model, and, for /sup 168/Er, the interacting boson approximation. For B/sub ..gamma../, all of the above models predict the increasing trend with increasing mass number seen in the measurements, but are unable to correctly predict the absolute magnitudes.« less
  • Levels 2/sup +/, 3/sup -/, 1/sup -/, 2/sup -/, 3/sup -1/, 5/sup -/ are interpreted as eigenvalues of a boson expanded Hamiltonian containing a shell model term, pairing, and quadrupole-quadrupole and octupole-octupole interaction. The expansion is performed in terms of standard RPA noncollective phonons and the so-callled correlated phonons which are related to the RPA collective phonons by a canonical transformation whose parameters are determined so that the energy of the ground state is minimum. The noncollective degrees of freedom are included via an effective Hamiltonian depending on energy. Formalism is applied to /sup 114/Sn, /sup 116/Sn, and /sup 118/Sn.more » Also, transition probabilities and quadrupole moments are calculated. Results are compared with experimental data as well as with the previous theoretical calculations. (AIP)« less