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Shell-model studies of the N = 50 isotones in the /sup 78/Ni doubly magic region

Thesis/Dissertation ·
OSTI ID:5959863
The study of excited states in the N = 50 isotones /sup 82/Ge and /sup 83/As following the ..beta.. decay of the neutron-rich nuclei /sup 82/Ga and /sup 83/Ge is reported. This work was performed using the on-line isotope separator facility TRISTAN at Brookhaven National Laboratory. The /sup 83/Ge half-life was measured to be 1.85 +/- 0.06 s. On the basis of ..gamma.. singles and ..gamma..-..gamma.. coincidence measurements a total of 51 ..gamma.. rays were placed in a level scheme for /sup 93/As with 27 levels up to 4.84 MeV. The /sup 92/Ga half-life was measured to be 0.62 +/- 0.02 s. On the basis of ..gamma.. singles and ..gamma..-..gamma.. coincidence measurements, a total of 11 ..gamma.. rays were placed in a level scheme for /sup 82/Ge with 7 levels up to 3.26 MeV. These measurements also established the existence of delayed-neutron emission from /sup 82/Ga by the observance of 6 ..gamma.. rays associated with the depopulation of levels in /sup 81/Ge. An angular correlation measurement was performed for levels in /sup 82/Ge to establish J/sup ..pi../ values with only tentative results. The level structure for the N = 50 isotones /sup 82/Ge, /sup 83/As, /sup 84/Se, /sup 85/Br, and /sup 86/Kr are compared with the results of a large-space shell-model calculation assuming an inert /sup 78/Ni core. The results of this comparison do not establish the validity of the inert /sup 78/Ni core.
Research Organization:
Iowa State Univ. of Science and Technology, Ames (USA)
DOE Contract Number:
W-7405-ENG-82
OSTI ID:
5959863
Country of Publication:
United States
Language:
English

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Related Subjects

651620* -- Nuclear Properties & Reactions
A=59-89
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
ARSENIC
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BNL
COINCIDENCE METHODS
CORRELATIONS
COUNTING TECHNIQUES
DATA
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GAMMA SPECTRA
GERMANIUM 82
GERMANIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NATIONAL ORGANIZATIONS
NICKEL 78
NICKEL ISOTOPES
NUCLEAR MODELS
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SEMIMETALS
SHELL MODELS
SPECTRA
US AEC
US DOE
US ERDA
US ORGANIZATIONS