Properties of high-spin states in /sup 91/Nb and /sup 91/Zr via /sup 6/Li-induced reactions. [J,. pi. , multipolarities, isomeric lifetimes]

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

DOI:https://doi.org/10.1103/PhysRevC.13.1900· OSTI ID:7354495

Brown, B A; Lesser, P M.S.; Fossan, D B

The properties of high-spin states in /sup 91/Nb and /sup 91/Zr have been studied with the /sup 88/Sr(/sup 6/Li, 3n)/sup 91/Nb and /sup 88/Sr(/sup 6/Li, p2 n)/sup 91/Zr reactions. In-beam measurements with Ge(Li) and Si(Li) detectors of ..gamma..-ray excitation functions, ..gamma..-..gamma.. coincidences, ..gamma..-ray angular distributions, and pulsed beam-..gamma.. timing spectra were made to establish decay schemes, level energies, spin-parity assignments, ..gamma..-ray multipolarities, and isomeric lifetimes. All of the high-spin states involving the ..pi..1g/sub 9///sub 2/, ..pi..2p/sub 1///sub 2/, and ..nu..2d/sub 5///sub 2/ orbitals as well as other more complicated states were identified. In particular, the theoretically predicted isomeric states in /sup 91/Nb and /sup 91/Zr were found: the vertical-bar (1g/sub 9///sub 2/)/sup 2/2p/sub 1///sub 2/, 17/2/sup -/> state in /sup 91/Nb is at 2035 keV with a tau = 5.42 +- 0.18 ..mu..sec, and vertical-bar (1g/sub 9///sub 2/) /sup 2/2d/sub 5///sub 2/, 21/2/sup +/> state in /sup 91/Zr is at 3167 keV with a tau = 6.28 +- 0.20 ..mu..sec. The experimental energy levels and B (E2) values (E2 effective charges) obtained for these nuclei as well as those of other N = 50 and 51 nuclei are compared with recent theoretical work of Gloeckner et al. (AIP)

• Research Organization: Department of Physics, State University of New York, Stony Brook, New York 11794
• OSTI ID: 7354495
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 13:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651723* -- Nuclear Properties & Reactions
A=90-149
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651725 -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FERMIONS
FUSION REACTIONS
HADRONS
HEAVY ION REACTIONS
HIGH SPIN STATES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIFETIME
LITHIUM 6 REACTIONS
NEUTRONS
NIOBIUM 91
NIOBIUM ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PROTONS
RADIOISOTOPES
SPIN
STABLE ISOTOPES
STRONTIUM 88 TARGET
TARGETS
YEARS LIVING RADIOISOTOPES
ZIRCONIUM 91
ZIRCONIUM ISOTOPES