Collective excitation of /sup 172/Yb from inelastic. cap alpha. scattering at 36 MeV

Journal Article · Thu Oct 01 04:00:00 EDT 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.1442· OSTI ID:6234493

Govil, I M; Fulbright, H W; Cline, D

The collective excitation of the natural parity states in /sup 172/Yb has been studied with 36 MeV ..cap alpha.. particles. An analysis of the ground-state band data through I/sup ..pi../ = 6/sup +/ gave deformation parameters ..beta../sub 2/ = +0.21 +- 0.01, ..beta../sub 4/ = -0.028 +- 0.004, and ..beta../sub 6/ = 0 +- 0.002. Two K/sup ..pi../ = 2/sup +/ bands, with band heads at 1465 and 1608 keV, and the ..beta.. vibrational K/sup ..pi../ = 0/sup +/ band with a 2/sup +/ state at 1118 keV are excited weakly. Other 2/sup +/ states at 2184, 2255, 2367, 2465, 2580, 2650, 2738, 2836, 2890, and 2955 keV are seen, and their isoscalar strengths are found for the first time. The B(E2) strengths found are roughly in agreement with interacting boson model predictions close to the SU(3) limit. At 1263 keV, the 4/sup +/ state of the K/sup ..pi../ = 3/sup +/ band is found to have an isoscalar E4 strength = 0.036 e/sup 2/b/sup 4/ (7 single particle units). A compilation plus reanalysis of earlier data exhibits unexpectedly strong E4 strength to the 4/sup +/ members of the lowest K = 2/sup +/ and 3/sup +/ bands in strongly deformed rare earth nuclei. The octupole strength in this nucleus lies mainly in four 3/sup -/ states at 1222, 1710, 1822, and 2030 keV with total isoscalar E3 strength of 0.147 e/sup 2/b/sup 3/. The results for the negative parity states are compared with the theory of Neergaerd and Vogel.

• Research Organization: Nuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627
• OSTI ID: 6234493
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 36:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651820* -- Nuclear Properties & Reactions
A=150-189
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
COLLECTIVE MODEL
CORIOLIS FORCE
DEFORMATION
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITED STATES
INELASTIC SCATTERING
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIE GROUPS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
OPTICAL MODELS
PARITY
PARTICLE PROPERTIES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SCATTERING
SPIN
STABLE ISOTOPES
SU GROUPS
SU-3 GROUPS
SYMMETRY GROUPS
TARGETS
VIBRATIONAL STATES
YTTERBIUM 172
YTTERBIUM 172 TARGET
YTTERBIUM ISOTOPES