DECAY SCHEME OF THE ISOMERS OF Te$sup 12$$sup 9$

Journal Article · Mon May 25 04:00:00 EDT 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.134.B705· OSTI ID:4003544

Devare, S H; Devare, H G

The decay of 70-min /sup 129/Te and 33-day /sup 129m/Te was studied using a beta-ray spectrometer, scintillation spectrometers, and coincidence techniques The 70-min activity, studied in equilibrium with /sup 129m/Te and also independently, was seen to emit gamma rays of energies 27, 205, 245, 275, From coincidence relations among these gamma rays, it was concluded that levels at 27, 275, 350 or 755, 482, 550, min activity. /sup 129m/Te was observed to decay by the emission of gamma rays oE energies 550, 695, 720, and 830 kev in addition to the 106-kev isomeric transition. These gamma rays were attributed to the excitation of levels at 695, 830, 1385, and 1415 kev. The Fermi plot of the beta spectrum of /sup 129m/Te studied with a Siegbahn-Slatis spectrometer showed beta groups with end-point energies of 1595, 1452, 976, and 690 kev. From beta-gamma coincidence measurements it was concluded that 1595 kev is the end-point energy of the beta transition from /sup 129m/Te to the ground state of /sup 129/I while 1452 kev is the end-point energy of the beta transition from the 70-min activity to the 27-kev level. Comparison of the total intensities of the beta transitions from /sup 129m/Te and /sup 129/Te showed that the isomeric transition takes place with a branching ratio of 0.64. The log ft values for the various beta groups were found from their relative intensities and spin assignments to various levels were made on this basis. (auth)

• Research Organization: Tata Inst. of Fundamental Research, Bombay
• NSA Number: NSA-18-021285
• OSTI ID: 4003544
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 134; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETA PARTICLES
BETA SPECTROMETERS
BRANCHING RATIO
COINCIDENCE METHODS
DECAY
EXCITATION
FERMI PLOT
GAMMA RADIATION
HALF-LIFE
IODINE 129
ISOMERS
MEASURED VALUES
PHYSICS
RADIOACTIVITY
SCINTILLATION COUNTERS
SPECTRA
SPIN
TELLURIUM 129