High spin states in sup 181 Ir and backbending phenomena in the Os-Pt region

Journal Article · Tue Dec 31 23:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.103· OSTI ID:5081288

Kaczarowski, R ^[1]; Garg, U; Funk, E G; Mihelich, J W ^[2]

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1. Physics Department, University of Notre Dame, Notre Dame, Indiana 46556 (United States) Soltan Institute for Nuclear Studies, 05-400 Swierk (Poland)
2. Physics Department, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

The {sup 169}Tm({sup 16}O,4{ital n}){sup 181}Ir reaction has been employed to investigate the high spin states of {sup 181}Ir using in-beam {gamma} spectroscopy. A well-developed system of levels built on the {ital h}{sub 9/2} subshell was identified up to a maximum spin of (41/2{sup {minus}}). Two rotational bands built on the isomeric states with {tau}{sub 1/2}=0.33 {mu}s ({ital E}{sub {ital x}}=289.2 keV) and 0.13 {mu}s ({ital E}{sub {ital x}}=366.2 keV), respectively, were observed. The deduced {ital g}{sub {ital K}} values of 1.19{plus minus}0.11 and 1.50{plus minus}0.12 indicate Nilsson assignments of 9/2{sup {minus}}(514) and 5/2{sup +}(402), respectively, for the bandheads of these bands. A high spin ({ital I}{ge}19/2) isomer with {tau}{sub 1/2}=22 ns was found at an excitation energy above 1.96 MeV. The experimental results are discussed in terms of rotational models including Coriolis coupling and providing for a stable triaxial shape of the {sup 181}Ir nucleus.

• OSTI ID: 5081288
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:1; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663110 -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BACKBENDING
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COLLECTIVE EXCITATIONS
CORIOLIS FORCE
DECAY
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
GAMMA CASCADES
GAMMA DECAY
HADRONS
HEAVY ION REACTIONS
HEAVY NUCLEI
HIGH SPIN STATES
IRIDIUM 181
IRIDIUM ISOTOPES
ISOMERIC TRANSITIONS
ISOTOPES
LIFETIME
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR CASCADES
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
OXYGEN 16 REACTIONS
PARTICLE PROPERTIES
RADIOISOTOPES
SPIN
TARGETS
THULIUM 169 TARGET