Level structure of /sup 174/Yb from the /sup 173/Yb(n,. gamma. ) reaction

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.23.153· OSTI ID:6745135

Greenwood, R C; Reich, C W

The level structure of /sup 174/Yb has been studied using the /sup 173/Yb(n,..gamma..) reaction with both thermal and 2-keV neutrons. Measurements of ..gamma..-ray energies and intensities were made using Ge(Li) detectors. From these data a neutron separation energy of 7464.8 +- 0.5 keV has been determined for /sup 174/Yb. A level scheme is proposed for /sup 174/Yb which contains 47 excited states, with identified de-excitation modes, below 2.35 MeV. Features of the proposed level scheme include: the K/sup ..pi../=2/sup -/, 0/sup -/, and 3/sup -/ octupole-vibrational bands with band-head energies of 1318, 1710, and 1851 keV, respectively; the ..gamma..-vibrational band at 1634 keV; three excited K/sup ..pi../=0/sup +/ bands with band-head energies of 1487, 1885, and 2100 keV; and, several two-quasiparticle bands with band-head energies in keV (and K/sup ..pi../ assignments) of 1606(3/sup +/), 1624(1/sup +/), 2016(3/sup +/), and 2049(3/sup -/). Configuration assignments for these two-quasiparticle bands are discussed. The available data for the K/sup ..pi../=3/sup +/ band at 1606 keV are not inconsistent with the assumption that it has collective character; and it is suggested that it, together with the lowest-lying 3/sup +/ band in /sup 172/Yb (at 1172 keV), might represent, in the framework of the interacting boson approximation model, examples of g-boson excitations.

• Research Organization: Idaho National Engineering Laboratory, EGandG Idaho, Inc., Idaho Falls, Idaho 83415
• OSTI ID: 6745135
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 23:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYON REACTIONS
BARYONS
BINDING ENERGY
CAPTURE
COMPOUND-NUCLEUS REACTIONS
DEFORMED NUCLEI
ELEMENTARY PARTICLES
ENERGY
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITED STATES
FERMIONS
GAMMA SPECTRA
HADRON REACTIONS
HADRONS
INTERACTING BOSON MODEL
INTERMEDIATE MASS NUCLEI
ISOTOPES
KEV RANGE
KEV RANGE 01-10
MATHEMATICAL MODELS
NEUTRON REACTIONS
NEUTRON SEPARATION ENERGY
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARITY
PARTICLE PROPERTIES
QUASI PARTICLES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SHELL MODELS
SPECTRA
SPIN
STABLE ISOTOPES
TARGETS
THERMAL NEUTRONS
VIBRATIONAL STATES
YTTERBIUM 173 TARGET
YTTERBIUM 174
YTTERBIUM ISOTOPES