STUDIES OF DECAY SCHEMES IN THE OSMIUM-IRIDIUM REGION. II. DECAY OF 12-DAY Ir$sup 19$$sup 0$

Journal Article · Thu Sep 15 04:00:00 EDT 1960 · Physical Review (U.S.) Superseded in part by Phys.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.119.1953· OSTI ID:4150728

Kane, W R; Emery, G T; Scharff-Goldhaber, G; McKeown, M

Spectra of the gamma rays and internal conversion electrons emitted in the decay of 12-day Ir/sup 190/ were studied in detail. Internal conversion spectra were obtained with the aid of double-focusing and intermediate-image BETA spectrometers and a permanent-magnet spectrograph. Gamma spectra were obtained by means of photoelectric conversion, employing a double-focusing spectrometer, and by scintillation techniques. These measurements of the energies and relative intensities of gamma rays and internal conversion electrons give internal conversion coefficients for a number of transitions. These data, coupled with coincidence studies of gamma rays, support the level scheme reported by Nielsen et al. for Os/sup 190/ and establish new, oddparity levels at 1384, 1568, and 1876 kev. An upper limit of 2 x 10/sup -5/ is set on positron branching in the decay of Ir/sup 190/. Relative electron capture transition probabilities for the decay of Ir/sup 190/ to Os/sup 190/ and ratios of reduced transition probabilities for electromagnetic transitions from a number of levels of Os/sup 190/ follow from these results. They are compared with the predictions of the strong-coupling model and the asymmetric rotor model. The half life of Ir/sup 190/ was found to be 12.3 plus or minus 0.4 days. Even-A iridium-osmium total disintegration energies were found to rise substantially above the values predicted by semiempirical mass formulas; this suggested a possible effect of the change in the nuclear deformation in this region. (auth)

• Research Organization: Harvard Univ., Cambridge, Mass.
• NSA Number: NSA-14-024892
• OSTI ID: 4150728
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 119; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETA SPECTROMETERS
BIBLIOGRAPHY
BRANCHING RATIO
CAPTURE
DECAY
DEFORMATION
ELECTROMAGNETIC WAVES
ELECTRONS
ENERGY
ENERGY LEVELS
GAMMA RADIATION
GAMMA SPECTROMETERS
HALF-LIFE
INTERNAL CONVERSION
IRIDIUM 190
MAGNETS
MASS
MEASURED VALUES
NUCLEAR MODELS
OSMIUM 190
PARITY
PHOTOELECTRIC EFFECT
PHYSICS
POSITRONS
ROTATION
SCINTILLATION COUNTERS
SPECTRA
TRANSIENTS