Collective band structure to high spin and shape coexistence in /sup 76/Kr

Journal Article · Thu Apr 01 04:00:00 EST 1982 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.25.1941· OSTI ID:5265098

Piercey, R B; Ramayya, A V; Hamilton, J H; Sun, X J; Zhao, Z Z; Robinson, R L; Kim, H J; Wells, J C

Excited states in /sup 76/Kr have been investigated via the /sup 66/Zn(/sup 12/C, 2n) reaction at a beam energy of 39 MeV. Gamma-ray energies, intensities, spins, parities, and mean lives of excited states were extracted from measurements of the ..gamma.. rays which were emitted in-beam. The energies of 25 excited levels were deduced from ..gamma..-..gamma.. coincidence data, and all but three of these levels are members of bandlike structures which persist to high spin. The Doppler shift attenuation method was used to extract the lifetimes of thirteen excited levels. The E2 strengths are highly collective. The positive parity yrast band to spin (12/sup +/) has been observed with a forward bend at low spin, but with no backbending in the moment of inertia below 12/sup +/. A positive parity band with even- and odd-spin members to (6/sup +/) and (9/sup +/), respectively, has been observed and is interpreted as a ..delta..J = 1 quasigamma band. Negative-parity bands built on 5/sup -/ and (6/sup -/) levels have been observed to spins of (13/sup -/) and (12/sup -/), respectively. Finally, the first excited 0/sup +/ state and a 2/sup +/ level built on it have been identified and are assigned to a near spherical configuration which coexists with the ground state that has an unusually large deformation.

• Research Organization: Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235
• OSTI ID: 5265098
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 25:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BRANCHING RATIO
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COLLECTIVE MODEL
COMPOUND-NUCLEUS REACTIONS
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
KRYPTON 76
KRYPTON ISOTOPES
LIFETIME
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARITY
PARTICLE PROPERTIES
RADIATIONS
RADIOISOTOPES
SPIN
TARGETS
ZINC 66 TARGET