High-spin level structure of /sup 190/Pt and /sup 192/Pt

Journal Article · Tue Jun 01 04:00:00 EDT 1976 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.13.2197· OSTI ID:7282044

Cunnane, J C; Piiparinen, M; Daly, P J; Dors, C L; Khoo, T L; Bernthal, F M

The level structures of the shape transitional nuclei /sup 190/Pt and /sup 192/Pt have been studied by (..cap alpha..,xn..gamma..) reactions on enriched Os targets. The measurements included ..gamma..-ray singles, prompt and delayed ..gamma..-..gamma.. coincidences, half-life determinations in the range 1--500 ns, and ..gamma..-ray angular distributions. Detailed level schemes for /sup 190/Pt and /sup 192/Pt, incorporating much new spectroscopic information, are reported. Acute backbending observed at about spin 10 in the positive parity yrast sequences of the two nuclei is attributed to intersection of the ground bands by rotation aligned bands of both (..nu..i/sub 13///sub 2//sup -2/) and (..pi..h/sup -2//sub 11///sub 2/) character. A description of well-developed 5/sup -/ bands observed in both nuclei as semidecoupled (..nu..i/sub 13///sub 2/, ..nu..j) bands is briefly discussed. 10/sup -/ isomers with half-lives of 47 +- 6 ns in /sup 190/Pt an 250 +- 30 ns in /sup 192/Pt are reported. The nature of these isomers is discussed in light of our related finding that the neighboring nuclei /sup 189/,/sup 191/,/sup 193/Pt have triaxial shapes (..gamma..approx.30degree), and it is concluded that the 10/sup -/ states are predominantly of (..nu..i/sub 13///sub 2/, etah/sub 9///sub 2/) two-quasiparticle composition. (AIP)

• Research Organization: Chemistry Department, Purdue University, West Lafayette, Indiana 47907
• OSTI ID: 7282044
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 13:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651923* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Energy Levels & Transitions-- (-1987)
651925 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY RADIOISOTOPES
ALPHA REACTIONS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYONS
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITED STATES
FERMIONS
GAMMA RADIATION
HADRONS
HALF-LIFE
HEAVY NUCLEI
HIGH SPIN STATES
IONIZING RADIATIONS
ISOTOPES
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
OSMIUM 188 TARGET
OSMIUM 190 TARGET
OSMIUM 192 TARGET
PARTICLE PROPERTIES
PLATINUM 190
PLATINUM 192
PLATINUM ISOTOPES
RADIATIONS
RADIOISOTOPES
ROTATIONAL STATES
SPIN
TARGETS
YEARS LIVING RADIOISOTOPES