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

Technical Report · Mon Jun 01 04:00:00 EDT 1987

OSTI ID:6346468

Winger, J A

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 83/As with 27 levels up to 4.84 MeV. The /sup 82/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. 45 refs., 21 figs., 18 tabs.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6346468
• Report Number(s): IS-T-1288; ON: DE87010930
• Country of Publication: United States
• Language: English

Related Subjects

651620* -- Nuclear Properties & Reactions
A=59-89
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
ARSENIC 83
ARSENIC ISOTOPES
BARYONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BROMINE 85
BROMINE ISOTOPES
COINCIDENCE METHODS
CORRELATIONS
COUNTING TECHNIQUES
DATA
DECAY
DELAYED NEUTRONS
ELEMENTARY PARTICLES
ENERGY LEVELS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
FISSION NEUTRONS
GALLIUM 82
GALLIUM ISOTOPES
GERMANIUM 82
GERMANIUM 83
GERMANIUM ISOTOPES
HADRONS
HALF-LIFE
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
KRYPTON 86
KRYPTON ISOTOPES
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NICKEL 78
NICKEL ISOTOPES
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SELENIUM 84
SELENIUM ISOTOPES
STABLE ISOTOPES