Fully automated radiochemical preparation system for gamma-sectroscopy on fission products and the study of the intruder and vibrational levels in /sup 93/Se

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6096550

Lien, III, O G

AUTOBATCH was developed to provide a usable source of shortlived neutron-rich nuclides through chemical preparation of the sample from fission products for detailed gamma-ray spectroscopy, which would complement the output of on-line isotope separators. With AUTOBATCH the gamma rays following the ..beta..-decay of /sub 33//sup 83/As/sub 5//sup 0/ were studied to determine: (1) the ground state spin and parity of /sup 83/As to be 5/2-; (2) the absolute intensity of the ..beta../sup -/ branch from /sup 83/As to /sup 83/Se/sup m/ to be 0.3%; (3) the absolute intensity of the ground state ..beta../sup -/ branch from /sup 83/Se/sup m/ to /sup 83/Br to be 39%; (4) the halflife of the 5/2/sub 1/+ level to be 3.2 ns; (5) the structure of /sub 3//sup 483/Se/sub 49/. The results are used to show that the intruder structure which had been previously observed in the odd mass /sub 49/In isotopes could be observed in the N = 49 isotones. The observed structure is discussed in terms of the unified model calculations of Heyde which has been used to describe the intruder structure in the indium nuclei. The intruder structure is most strongly devloped, not at core mid-shell /sub 40//sup 89/Zr/sub 49/, but rather at core mid-sub-shell /sup 83/Se. Thus difference is qualitatively understood to be due to the blocking of collectivity by the Z = 40 subshell closure which prevents the intruder structure from occurring in /sup 87/Sr/sub 49/ and /sup 89/Zr/sub 49/.

• Research Organization: California Univ., Davis (USA)
• OSTI ID: 6096550
• Country of Publication: United States
• Language: English

Related Subjects

651622 -- Nuclear Properties & Reactions
A=59-89
Experimental-- Radioactive Decay-- (-1987)
651623* -- Nuclear Properties & Reactions
A=59-89
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARSENIC 83
ARSENIC ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
BRANCHING RATIO
CHEMICAL ANALYSIS
DATA
DECAY
ENERGY LEVELS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
GAMMA SPECTRA
HALF-LIFE
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
QUANTITATIVE CHEMICAL ANALYSIS
RADIOCHEMICAL ANALYSIS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SELENIUM 83
SELENIUM ISOTOPES
SPECTRA