Band crossings in the. gamma. -soft nucleus /sup 136/Nd

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

DOI:https://doi.org/10.1103/PhysRevC.36.153· OSTI ID:6346394

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

High-spin states have been populated in /sup 136/Nd using the /sup 116/Cd(/sup 24/Mg,4n..gamma..) /sup 136/Nd reaction. Several rotational bands have been observed based on two- and four-quasiparticle configurations. The ground-state band backbends sharply at a frequency h-dash-bar..omega.. = 0.34 MeV due to the alignment of a pair of h/sub 11/2/ protons. Both signatures of a negative parity side band based on a ..pi..h/sub 11/2/x..pi..g/sub 7/2/ configuration were observed to backbend at a frequency h-dash-bar..omega.. = 0.44 MeV, again due to the alignment of a pair of h/sub 11/2/ protons. All these bands are prolate because of the stabilizing influence of the h/sub 11/2/ quasiprotons on the ..gamma..-soft core. In addition to the h/sub 11/2/ proton alignment in the ground-state band, a rotational band is observed built on a second 10/sup +/ state, which involves the alignment of a pair of h/sub 11/2/ neutrons. An alignment of neutrons from the upper h/sub 11/2/ midshell drives the nucleus towards a collectively rotating oblate (..gamma.. = -60/sup 0/) shape. Both signatures of a band based on a ..nu..h/sub 11/2/x..nu..g/sub 7/2/ configuration were observed, also possibly oblate. The observation of both neutron and proton low-frequency alignments is consistent with cranked-shell model calculations and theoretical estimates of the prolate-oblate energy difference for this nucleus.

• Research Organization: Physics Department, State University of New York at Stony Brook, Stony Brook, New York 11794
• OSTI ID: 6346394
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 36:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BACKBENDING
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CADMIUM 116 TARGET
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
DATA
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXCITED STATES
EXPERIMENTAL DATA
FERMIONS
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
HIGH SPIN STATES
INFORMATION
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MAGNESIUM 24 REACTIONS
MATHEMATICAL MODELS
NEODYMIUM 136
NEODYMIUM ISOTOPES
NEUTRONS
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
POTENTIALS
PROTONS
QUASI PARTICLES
RADIATIONS
RADIOISOTOPES
RARE EARTH NUCLEI
ROTATIONAL STATES
SHELL MODELS
SOFT-CORE POTENTIAL
TARGETS