Level structure of /sup 67/Ge and its implications for the general structure of nuclei in the 1f-2p shell

Journal Article · Thu Sep 01 04:00:00 EDT 1983 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.28.1069· OSTI ID:5665261

Murphy, M J; Davids, C N

From the results of prompt and ..beta..-delayed ..gamma..-ray singles and ..gamma..-..gamma.. coincidence measurements, twenty-four excited states and forty-six gamma transitions are identified in the level scheme of /sup 67/Ge. Angular distributions and directional correlations of prompt /sup 67/Ge gamma rays have been measured to obtain the spins of the /sup 67/Ge ground state and excited states at 18.2, 122.7, 243.6, 711.3, and 1019.9 keV. Parities are assigned to the first five states on the basis of fp shell systematics and observed /sup 67/Ge gamma-ray branching ratios. The 752-keV excitation energy of the first (9/2)/sup +/ level in /sup 67/Ge is determined from an excitation function for the /sup 64/Zn(..cap alpha..,n..gamma..)/sup 67/Ge reaction. The angular distribution and correlation measurements also provide E2/M1 mixing ratios for the 104.4, 120.8, 122.7, 243.6, 589.0, and 897.5 keV /sup 67/Ge gamma rays. The level scheme of /sup 67/Ge and the corresponding schemes for /sup 63,65/Ni, /sup 65,67/Zn, and /sup 69/Ge are observed to have strong similarities at low excitation. Systematic trends in E2 transition rates are interpreted in the context of shell and collective features of the nuclei. It is found that models based on a single particle coupled to a vibrational or deformed core do not explain the observed systematics, and are an inaccurate representation of these nuclei. The systematics do agree with a many-nucleon shell model emphasizing the short-range pairing interaction and configuration mixing for the valence neutrons.

• Research Organization: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 5665261
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 28:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651525* -- Nuclear Properties & Reactions
A=39-58
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651623 -- Nuclear Properties & Reactions
A=59-89
Experimental-- Energy Levels & Transitions-- (-1987)
651625 -- Nuclear Properties & Reactions
A=59-89
Experimental-- Nuclear Reactions & Scattering-- (-1987)
653007 -- Nuclear Theory-- Nuclear Models-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR DISTRIBUTION
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
COPPER 63 TARGET
CROSS SECTIONS
DEFORMATION
DISTRIBUTION
E2-TRANSITIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
FERMIONS
FUNCTIONS
GAMMA RADIATION
GERMANIUM 67
GERMANIUM ISOTOPES
HADRONS
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
LITHIUM 6 REACTIONS
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NEUTRONS
NICKEL 58 TARGET
NITROGEN 14 REACTIONS
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
RADIATIONS
RADIOISOTOPES
SHELL MODELS
TARGETS
ZINC 64 TARGET