EVIDENCE FOR AN ISOMERIC STATE OF Y$sup 9$$sup 0$

Journal Article · Tue Aug 15 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys.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.123.1365· OSTI ID:4841347

Alford, W L; Koehler, D R; Mandeville, C E

The recently reported activity induced by neutron bombardment of niobium has been produced by 14-Mev neutrons and by neutrons of energy less than 6 Mev, on both niobium and zirconium. In each case, chemical separation showed the activity to be due tc an isotope of yttrium. Two coincident gamma rays having energies of 0.200 and 0.485 Mev and a half-life of 3.1 plus or minus 0.1 hr were observed; these observations were in agreement with earlier results. The activity appears very similar to that which has been previously attributed to the decay of Y/sup 92/. However, threshold considerations and the failure to observe by means of a thin-window Geiger counter any beta emission associated with this gamma activity, point to an isomeric state of Y/sup 90/. Experiments with separated isotopes of Zr/sup 90/ and Zr/sup 92/ support this assignment. (auth)

• Research Organization: Army Rocket and Guided Missile Agency, Redstone Arsenal, Ala.
• NSA Number: NSA-15-028551
• OSTI ID: 4841347
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 123; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETA DETECTION
COINCIDENCE METHODS
ENERGY RANGE
FAST NEUTRONS
GAMMA RADIATION
GEIGER-MUELLER COUNTERS
HALF-LIFE
ISOMERS
MEASURED VALUES
MEV RANGE
NEUTRON BEAMS
NIOBIUM
PHYSICS
QUALITATIVE ANALYSIS
RADIOACTIVITY
TARGETS
WINDOWS
YTTRIUM 90
YTTRIUM 92
ZIRCONIUM
ZIRCONIUM 90
ZIRCONIUM 92