Fully automated radiochemical preparation system for gamma-spectroscopy on fission products and the study of the intruder and vibrational levels in /sup 83/Se

Technical Report · Sat Oct 01 00:00:00 EDT 1983

DOI:https://doi.org/10.2172/5134558· OSTI ID:5134558

Lien, III, O G

AUTOBATCH was developed to provide a usable source of short-lived 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../sup -/ decay of /sup 83/As were studied to determine the ground state spin and parity of /sup 83/As to be 5/2/sup -/; the absolute intensity of the ..beta../sup -/ branch from /sup 83/As to /sup 83/Se/sup m/ to be 0.3%; the absolute intensity of the ground state ..beta../sup -/ branch from /sup 83/Se/sup m/ to /sup 83/Br to be 39%; the halflife of the 5/2/sub 1//sup +/ level to be 3.2 ns; and the structure of /sup 83/Se/sub 49/. 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 developed, not at core mid-shell, /sup 89/Zr/sub 49/, but rather at core mid-sub-shell /sup 83/Se. This 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: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5134558
• Report Number(s): UCRL-53452; ON: DE84008871
• Resource Relation: Other Information: Thesis
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARSENIC 83
BETA DECAY
SELENIUM 83
ENERGY LEVELS
AUTOMATION
FISSION PRODUCTS
GAMMA SPECTROSCOPY
RADIOCHEMISTRY
SAMPLING
SEPARATION PROCESSES
VIBRATIONAL STATES
ARSENIC ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMISTRY
DECAY
EVEN-ODD NUCLEI
EXCITED STATES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATERIALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
RADIOACTIVE MATERIALS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SELENIUM ISOTOPES
SPECTROSCOPY
400700* - Radiochemistry & Nuclear Chemistry
651623 - Nuclear Properties & Reactions
A=59-89
Experimental- Energy Levels & Transitions- (-1987)