Beta-decay measurements of neutron-deficient cesium isotopes

Technical Report · Tue Mar 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/6181787· OSTI ID:6181787

Parry, R. F.

Beta decay endpoint energy measurements of the neutron deficient cesium isotopes were done using an energy spectrum shape fitting technique. This was a departure from the typical method of endpoint energy analysis, the Fermi-Kurie plot. A discussion of the shape fitting procedure and its improved features are discussed. These beta endpoint measurements have led to total decay energies (Q/sub EC/) of the neutron deficient /sup 119/ /sup 123/Cs isotopes. The total decay energies of /sup 122m/Cs (Q/sub EC/ = 6.95 +- 0.25 MeV) and /sup 119/Cs (Q/sub EC/ = 6.26 +- 0.29 MeV) were new measurements. The total decay energies of /sup 123/Cs (Q/sub EC/ = 4.05 +- 0.18 MeV), /sup 122g/Cs (Q/sub EC/ = 7.05 +- 0.18 MeV), /sup 121/Cs (Q/sub EC/ = 5.21 +- 0.22 MeV), and /sup 120/Cs (Q/sub EC/ = 7.38 +- 0.23 MeV) were measurements with significantly improved uncertainties as compared to the literature. Further, a combination of the energy levels derived from previous literature gamma-gamma coincident measurements and the experimental beta-coincident gamma decay energies has supported an improved level scheme for /sup 121/Xe and the proposal of three new energy levels in /sup 119/Xe. Comparison of the experimental cesium mass excesses (determined with our Q/sub EC/ values and known xenon mass excesses) with both the literature and theoretical predicted values showed general agreement except for /sup 120/Cs. Possible explanations for this deviation are discussed.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6181787
• Report Number(s): LBL-15875; ON: DE83012438
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
CESIUM 119
CESIUM 120
CESIUM 121
CESIUM 122
CESIUM 123
CESIUM ISOTOPES
COINCIDENCE SPECTROMETRY
DATA
DATA ANALYSIS
DECAY
ENERGY
ENERGY LEVELS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
GAMMA SPECTRA
HALF-LIFE
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MASS DEFECT
MINUTES LIVING RADIOISOTOPES
NEUTRON-DEFICIENT ISOTOPES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
Q-VALUE
RADIOISOTOPES
SPECTRA
XENON 119
XENON 121
XENON ISOTOPES