Neutron single-particle energies in the Yb isotopes

doi:10.1016/0029-5582(66)90842-X

Nuclear Physics

Volume 89, Issue 1, December 1966, Pages 11-21

https://doi.org/10.1016/0029-5582(66)90842-X Get rights and content

Abstract

Excitation energies of seniority-one states in the odd-mass Yb isotopes are calculated in the framework of the pairing force theory. A neutron sigle-particle energy level spectrum is deduced by comparing calculated and observed excitation energies.

Pairing factors for electromagnetic transitions are calculated for a system of equally spaced levels representative of the Yb isotopes.

References (18)

R.R. Chasman
Nuclear Physics
(1965)
T.H. Braid et al.
Phys. Lett.
(1965)
R. Graetzer et al.
Nuclear Physics
(1966)
K.T. Hecht et al.
Nuclear Physics
(1962)
D. Burke et al., to be...
M.N. Vergnes et al.
Phys. Rev.
(1963)
R.R. Chasman
Phys. Rev.
(1964)
R.R. Chasman
Phys. Rev.
(1965)
V.G. Soloviev
Mat. Fys. Skr. Dans. Vid. Selsk.
(1961)

There are more references available in the full text version of this article.

Cited by (8)

Nuclear data sheets for A = 177
1975, Nuclear Data Sheets
Nuclear structure information for all nuclei with mass number A = 177 is summarized. Data from various decay and reaction experiments are compared. Evaluated data and the adopted spin, parity, and Nilsson-state assignments are given. Deviations from the regional trend of Nilsson ground-state assignments are noted for ¹⁷⁷W and ¹⁷⁷Re. Similar shifts have been observed in this region for nuclei 8 to 10 neutrons removed from the β-stability line. In all cases, low-lying K^π= 1/2^±orbitals move to ground.
Properties of single-particle states in the <sup>208</sup>Pb region
1974, Nuclear Physics, Section A
A pairing phase transition in the Yb isotopes
1970, Physics Letters B
Band mixing in <sup>167</sup>Er
1970, Nuclear Physics, Section A
The level structure of ¹⁶⁷Er and the de-excitation mechanism m this nucleus have been studied by radiative capture of thermal neutrons in ¹⁶⁶Er. High-resolution measurements of the gamma-ray spectrum have been performed using a Ge(Li) anti-Compton spectrometer in the low-energy region and a Ge(Li) pair spectrometer for the high-energy transitions. Coincidence relationships have been obtained from measurements with a Ge(Li)-NaI(T1) coincidence apparatus. The target was Er₂O₃ enriched to 95.6 % in ¹⁶⁶Er thus corresponding to a cross-section contribution of (68.8^+5.0_−6.4) % for ¹⁶⁶Er. More than 350 gamma-ray lines have been detected in the spectrum. Isotope assignment has been achieved by comparison of the spectra with those obtained from a sample of natural erbium. The high accuracy of the data and the coincidence results allow the construction of a transition diagram up to 1.5 MeV excitation energy. A large number of the observed energy levels have been assigned to specific configurations and their superimposed rotational bands. Detailed analysis of the data suggests considerable mixing between Nilsson states and the quadrupole vibrations Q₂₂, Q₂₋₂ and Q₂₀. Theoretical calculations have been performed which take into account pair correlations, quasiparticle-phonon interaction, rotation-vibration interaction and Coriolis coupling. It is shown that neglect of pair correlations leads to unreasonable matrix elements. While quasiparticle-phonon interaction and Coriolis coupling have decisive influence on the level structure and the de-excitation mechanism, the effects due to rotation-vibration interaction are in general small. The model predicts the energy and structure of individual levels, branching ratios for gamma-ray transitions, multipole mixtures and partial gamma-ray half-lives. In most cases, good agreement is achieved between the theoretical calculations and the experimental results. The neutron separation energy was found to be 436.15 ± 0.48 keV.
Das Kernniveauschema von Yb 175
1971, Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Simple momentum-dependent nuclear central potential
1971, Physical Review C

View all citing articles on Scopus

^†: Research sponsored by the Swedish Atomic Research Council and the United States A.E.C.

View full text

Neutron single-particle energies in the Yb isotopes

Abstract

Nuclear Physics

Phys. Lett.

Nuclear Physics

Nuclear Physics

Phys. Rev.

Phys. Rev.

Phys. Rev.

Mat. Fys. Skr. Dans. Vid. Selsk.