Multipole collectivity in /sup 168/Er from inelastic scattering

Journal Article · Sat Mar 01 04:00:00 EST 1986 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.33.793· OSTI ID:6049948

Govil, I M; Fulbright, H W; Cline, D; Wesolowski, E; Kotlinski, B; Backlin, A; Gridnev, K

The structure of the low-lying states of /sup 168/Er has been investigated by use of inelastic scattering. Differential cross sections for the elastic and inelastic scattering of 36 MeV ..cap alpha.. particles and 16 MeV deuterons from /sup 168/Er have been measured. Isoscalar transition strengths for l = 2, 3, and 4 excitation have been extracted by a coupled-channels distorted wave calculation involving collective model form factors. A number of known levels corresponding to the ground state band, ..gamma.. band, and octupole bands were seen. Results for the 2/sup +/, 4/sup +/, 6/sup +/, and 8/sup +/ states in the ground state band and 2/sup +/, 4/sup +/, and 6/sup +/ states in the ..gamma.. band imply the importance of the hexadecapole (..beta../sub 4/) and the hexacontatetrapole (..beta../sub 6/) shape components. The octupole states at 1431, 1633, and 1913 keV are excited with isoscalar strengths equal to 0.046, 0.058, and 0.023 e/sup 2/b/sup 3/, respectively, which are comparable with the corresponding B(E3) strengths known from Coulomb excitation of the 1431 and 1633 keV states. The octupole states at 2269, 2324, and 2486 keV with isoscalar E3 transition strengths 0.055, 0.022, and 0.018 e/sup 2/b/sup 3/, respectively, are newly identified. For quadrupole excitation the results agree in several ways with predictions of the interacting boson approximation model and the geometrical models and for octupole states there is a good agreement with theoretical results of Neergaaumlrd and Vogel.

• Research Organization: Nuclear Structure Research Laboratory, University of Rochester, Rochester, New York 14627
• OSTI ID: 6049948
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 33:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
CHARGED-PARTICLE REACTIONS
COLLECTIVE MODEL
COULOMB EXCITATION
COUPLED CHANNEL THEORY
CROSS SECTIONS
DATA
DEUTERON REACTIONS
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
E3-TRANSITIONS
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
ERBIUM 168
ERBIUM 168 TARGET
ERBIUM ISOTOPES
EVEN-EVEN NUCLEI
EXCITATION
EXPERIMENTAL DATA
FORM FACTORS
INELASTIC SCATTERING
INFORMATION
INTERACTING BOSON MODEL
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MULTIPOLE TRANSITIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
PARTICLE PROPERTIES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SCATTERING
SHELL MODELS
STABLE ISOTOPES
TARGETS