Inelastic proton scattering exciting the. gamma. -vibrational band in deformed nuclei (152 less than or equal to A less than or equal to 192) at 65 MeV and the systematics of the hexadecapole (Y/sub 42/) strength of the. gamma. vibration

Journal Article · Sun Nov 01 00:00:00 EST 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.1754· OSTI ID:5798876

Ichihara, T; Sakaguchi, H; Nakamura, M; Yosoi, M; Ieiri, M; Takeuchi, Y; Togawa, H; Tsutsumi, T; Kobayashi, S

Inelastic scattering exciting the 2/sup +/ and 4/sup +/ members of the K/sup ..pi../ = 2/sup +/ ..gamma..-vibrational band in /sup 152,154/Sm, /sup 160/Gd, /sup 164/Dy, /sup 166,168/Er, /sup 176/Yb, /sup 182,184/W, and /sup 192/Os has been measured with 65-MeV polarized protons. Coupled-channel analyses have been performed assuming the ..gamma..-vibrational model or the asymmetric rotor model. A large hexadecapole (Y/sub 42/)= term in the ..gamma.. motion is necessary in both models in order to reproduce the experimental data. The quadrupole (Y/sub 22/) and hexadecapole (Y/sub 42/) transition strengths to the ..gamma..-vibrational band have been extracted systematically from the optical potential parameters and the deformation parameters for the first time. These show a strong mass number dependence, and can be understood qualitatively by a simple geometrical picture together with the quadrupole (Y/sub 20/) and hexadecapole (Y/sub 40/) moments. The experimental Y/sub 22/ and Y/sub 42/ strengths have been compared with a random-phase-approximation calculation. This suggests the importance of the hexadecapole degree of freedom in the ..gamma.. vibration. A density-dependent Hartree-Fock calculation explains the quadrupole (Y/sub 20/) moments and the trend of the hexadecapole (Y/sub 40/) moments of the deformed optical potentials very well. The effect of the density dependence of the effective interaction is also discussed through the Y/sub 20/ moments and Y/sub 22/ strengths.

• Research Organization: Department of Physics, Kyoto University, Kyoto 606, Japan
• OSTI ID: 5798876
• Journal Information: Phys. Rev. C; (United States), Vol. 36:5
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DYSPROSIUM 164 TARGET
PROTON REACTIONS
ERBIUM 166 TARGET
ERBIUM 168 TARGET
GADOLINIUM 160 TARGET
OSMIUM 192 TARGET
INELASTIC SCATTERING
SAMARIUM 152 TARGET
SAMARIUM 154 TARGET
TUNGSTEN 182 TARGET
TUNGSTEN 184 TARGET
YTTERBIUM 176 TARGET
COUPLED CHANNEL THEORY
ENERGY LEVELS
HARTREE-FOCK METHOD
MEV RANGE 10-100
OPTICAL MODELS
POLARIZED BEAMS
RANDOM PHASE APPROXIMATION
VIBRATIONAL STATES
YTTERBIUM 176
BARYON REACTIONS
BEAMS
CHARGED-PARTICLE REACTIONS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITED STATES
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEV RANGE
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SCATTERING
STABLE ISOTOPES
TARGETS
YTTERBIUM ISOTOPES
651820* - Nuclear Properties & Reactions
A=150-189
Experimental
651920 - Nuclear Properties & Reactions
A=190-219
Experimental
653001 - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models