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Author Johnson, O. E. ♦ Smith, W. G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ BETA DECAY ♦ BETA SPECTROMETERS ♦ COINCIDENCE METHODS ♦ ENERGY ♦ ENERGY LEVELS ♦ GAMMA DETECTION ♦ GAMMA RADIATION ♦ MASS ♦ MEASURED VALUES ♦ MONOCRYSTALS ♦ NUCLEI ♦ PARITY ♦ SCINTILLATION COUNTERS ♦ SODIUM IODIDES ♦ SPECTRA ♦ SPIN ♦ YTTRIUM 91 ♦ ZIRCONIUM 91
Abstract The decay of Y/sup 91/ was studied using NaI(Tl) scintillation counters and a 4 pi beta-ray scintillation spectrometer. A single gamma ray with a measured energy of 1.208 plus or minus 0.010 Mev was observed. The shape and end-point energy of the weak ( approximately 0.3%) beta group in coincidence with the 1.208-Mev gamma ray was measured. The end-point energy was determined to be 0.319 plus or minus 0.010 Mev. The experimental shape factor is clearly in disagreement with that predicted for a once-forbidden unique transition, 41 = 2 (yes). The 0.319Mev beta spectrum yields a shape factor which may, within experimental accuracy, be interpreted as a statistical shape. These measurements yield a Y/sup 91/--Zr/sup 91/ mass difference of 1.527 plus or minus 0.014 Mev. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1960-06-01
Publisher Department Purdue Univ., Lafayette, Ind.
Journal Physical Review
Volume Number 118
Organization Purdue Univ., Lafayette, Ind.


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