DECAY OF SELENIUM-72

Journal Article · Sun Jun 01 04:00:00 EDT 1958 · Physical Review (U.S.) Superseded in part by Phys.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.110.1104· OSTI ID:4334700

Cumming, J B; Johnson, N R

Se/sup 72/ has been observed to decay by electron capture with a half- life of 8.40 plus or minus 0.08 days, predominantly to an excited state in As/ sup 72/ at 46.0 plus or minus 0.3 kev. The half life of this state is less than 1.5 x 10/sup -8/ sec. Less than 7% of Se/sup 72/ decays are to the ground state. The K-conversion coefficient of the 46-kev gamma was measured to be 0.63 plus or minus 0.06 and the K/L conversion ratio to be 9.7 plus or minus 0.5. The upper limit, 0.1%, obtained for the abundance of positrons places a maximum value on the decay energy of 1.2 Mev, which corresponds to a maximum log ft of 5.7 On these grounds the excited state is assigned a 1+ spin and the gamma transition is E1. In the course of these measurements, the ratio of intensities of x rays to 46-kev gamma rays in the decay of RaD (Pb/sup 210/) was redetermined to be 5.38 plus or minus 0.50. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.; Florida State Univ., Tallahassee; and Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-12-012856
• OSTI ID: 4334700
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 110; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ARSENIC 72-- BETA DECAY-- CAPTURE-- DECAY-- DIPOLES-- ELECTRIC MOMENTS-- ELECTRONS-- ENERGY-- ENERGY LEVELS-- GAMMA RADIATION-- HALF- LIFE-- MEASURED VALUES-- NUCLEAR STRUCTURE-- PARITY-- POSITRONS-- QUANTITY RATIO-- SELENIUM 72-- SPIN
DECAY-- GAMMA RADIATION-- LEAD 210-- MEASURED VALUES-- X RADIATION
PHYSICS