Band structure in /sup 147/ /sup 149/ /sup 151/Eu observed via (HI,xn) reactions

Journal Article · Fri Jul 01 04:00:00 EDT 1977 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.16.227· OSTI ID:7219528

Fleissner, J G; Funk, E G; Venezia, F P; Mihelich, J W

..gamma.. rays from levels in /sup 147/ /sup 149/ /sup 151/Eu have been studied using primarily (/sup 6/ /sup 7/Li,xn..gamma..) reactions. Prompt and delayed ..gamma..-..gamma.. coincidences, excitation functions, and angular distributions were used to study the in-beam ..gamma.. rays. Bands with ..delta..I = 2 built on an the 11/2/sup -/ isomeric state have been observed in all three nuclei and since the energy spacings strongly resemble those of the core nuclei they are interpreted as decoupled bands. The maximum spin observed in the decoupled band is 27/2/sup -/ for /sup 151/Eu and 23/2/sup -/ for /sup 149/ /sup 147/Eu. Possible unfavored states associated with the ..pi..h/sub 11/2/ system have also been identified. High spin positive parity states have been observed for /sup 147/Eu and /sup 149/Eu. The maximum spin observed for each nucleus is (33/2/sup +/) at 4178.1 keV for /sup 147/Eu, (29/2/sup +/) at 3042.0 keV for /sup 149/Eu, and (27/2/sup -/) at 2118.9 keV for /sup 151/Eu. The experimental results for the negative parity bands of /sup 149/ /sup 151/Eu have been compared with predictions of the triaxial rotor plus particle model incorporating a variable moment of inertia. The results of the model calculations give some indication of triaxial shapes for /sup 149/Eu and /sup 151/Eu although the predictions for the symmetric case are not significantly different from those of the asymmetric case.

• Research Organization: University of Notre Dame, Notre Dame, Indiana 46556
• OSTI ID: 7219528
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 16:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EUROPIUM 147
EUROPIUM 149
EUROPIUM 151
EUROPIUM ISOTOPES
EXCITATION FUNCTIONS
FERMIONS
GAMMA SPECTRA
HADRONS
HEAVY ION REACTIONS
HIGH SPIN STATES
INTERMEDIATE MASS NUCLEI
ISOTOPES
LANTHANUM 139 TARGET
LITHIUM 6 REACTIONS
LITHIUM 7 REACTIONS
METALS
NEODYMIUM
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RARE EARTHS
SPECTRA
STABLE ISOTOPES
TARGETS