Band crossings in even-even /sup 138/Sm and /sup 134/Nd

Journal Article · Tue Dec 01 04:00:00 EST 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.2380· OSTI ID:5740015

Paul, E S; Shi, S; Beausang, C W; Fossan, D B; Ma, R; Piel, Jr, W F; Xu, N; Weng, P K

The rotational alignment of h/sub 11/2/ quasiparticles has been observed in the even-even /sup 138/Sm and /sup 134/Nd nuclei by means of heavy-ion fusion-evaporation reactions. The structures observed are compared to those found recently in /sup 136/Nd. The ground-state bands of the /sup 136/Nd and /sup 138/Sm isotones (N = 76) possess significant triaxial shapes (..gamma..approx.-25/sup 0/). Rotational alignment of h/sub 11/2/ protons induces a shape change towards the prolate (..gamma.. = 0/sup 0/) shape, while h/sub 11/2/ neutron alignment induces a change towards the oblate (..gamma.. = -60/sup 0/) collective shape. In the more deformed /sup 134/Nd nucleus, band crossings are observed in both the ground-state band and the ..gamma..-vibrational band. The crossing in the ground-state band is attributed to h/sub 11/2/ protons, while a second band that feeds into both the ground-state band and the ..gamma..-vibrational band is built on the (h/sub 11/2/)/sup 2/ neutron-aligned configuration. In addition, negative-parity sidebands built on two-quasiproton configurations were seen in these nuclei. The systematics of the proton and neutron alignments are discussed.

• Research Organization: Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794
• OSTI ID: 5740015
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 36:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

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651720* -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CADMIUM 112 TARGET
CHARGED-PARTICLE REACTIONS
CHLORINE 37 REACTIONS
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
DEFORMATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
EXCITED STATES
FERMIONS
FUNCTIONS
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NEODYMIUM 134
NEODYMIUM 136
NEODYMIUM ISOTOPES
NEUTRONS
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PALLADIUM 104 TARGET
PROTONS
QUASI PARTICLES
RADIATIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
ROTATIONAL STATES
SAMARIUM 138
SAMARIUM ISOTOPES
SHELL MODELS
TARGETS