E2/Ml RATIOS IN THE ISOMERIC TRANSITIONS OF Te$sup 121$ AND Te$sup 123$, AND THE DECAY OF THE Te$sup 121$ ISOMERS TO Sb$sup 12$$sup 1$

Journal Article · Mon Mar 23 00:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

OSTI ID:4073853

Chu, Y Y; Kistner, O C; Li, A C; Monaro, S; Perlman, M L

The decay of Te/sup 121/ isomers and the decay of Te/sup 123m/ were investigated with scintillation and proportional counte spectrometers, coincidence techniques, and a high resolution beta-ray spectrometer for the measurement of the conversion spectrum. In the decay of the Te/sup 121/ isomers to levels of Sb/sup 121/, transitions of the following energies were found: 37, 66, 470, 508, 573, and 1110 kev. The 37, 1110, and 66,508 cascades were established by coincidence measurements. A 37, 470 cascade is indicated by precision energy measurements. Coincidences between the 66- and 1110-kev transitions expected to occur could not be found. By a careful analysis of the conversion spectrum, it was possible to determine, from L subshell ratios, the multipolarities of most of the gamma rays. A decay scheme is proposed that accounts for all of the observed data and in which the first-excited state in Sb/ sup 121/ lies at 37 kev. The half life of the 37-kev level in Sb/sup 121/, measured by the delayed coincidence method, was found to be (3.5 plus or minus 0.2) x 10 sec. From the analysis of the L/sub 1//L/sub 2//L/sub 3/ ratios observed in the conversion spectrum, the E2/M1 ratio values could be determined for the 212- and 159-kev transitions in Te/sup 121m/ and Te/sup 123m/, respectively. The results are: E2/M1 = 0.050 for the 212-kev transition and E2/ M1 = 0.0067 for the 159-kev transition. The E2 speeds of these transitions were inferred from the known lifetimes of the 212-kev state in Te/sup 121/ and of the 159-kev state in Te/sup 123/; the results are 26 and 4.5 times the single- particle speeds, respectively. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-18-015248
• OSTI ID: 4073853
• Report Number(s): BNL-7467; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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, Vol. Vol: 133; Other Information: BNL-7467. Orig. Receipt Date: 31-DEC-64
• Country of Publication: United States
• Language: English

Related Subjects

PHYSICS
ANTIMONY 121
BETA SPECTROMETERS
COINCIDENCE METHODS
DECAY
ENERGY LEVELS
GAMMA RADIATION
HALF-LIFE
INDEPENDENT PARTICLE MODEL
INTERNAL CONVERSION
ISOMERS
MEASURED VALUES
MULTIPOLARITY
NUCLEAR MODELS
PROPORTIONAL COUNTERS
RESOLUTION
SCINTILLATION COUNTERS
SPECTRA
SPECTROMETERS
TELLURIUM 121
TELLURIUM 123
TRANSIENTS