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NEW RADIOACTIVITY 43-MIN YTTRIUM-84

Journal Article · · J. Phys. Soc. Japan
DOI:https://doi.org/10.1143/JPSJ.17.1223· OSTI ID:4765420
A 43 plus or minus 2-min yttrium activity is observed in a natural strontium target irradiated with 57-Mev protons. The activity is assigned to Y/ sup 84/ by measured the excitation function. The 3.7-hr activity previously assigned to Y/sup 84/ is identified to Y/sup 85/. Gamma transitions of 0.453 Mev (10%), 0.590 Mev (15%), 0.795 Mev (100%, E2), 0.982 Mev (100%, E2), 1.041 Mev (50%, E2 or M1), 1.27 Mev (9%), and 1.47 Mev (6%) are observed in the scintillation and internal conversion spectra of Y/sup 84/. The positron spectrum taken with a beta-ray spectrometer gives maximum energies of 3.50 plus or minus 0.10 and 2.90 plus or minus 0.15 Mev. Gamma-gamma and positron-gamma coincidence measurements are carried out. A tentative decay scheme is proposed that involves the following energy levels in Sr 4: 0.982 or 0.795 Mev and parity of Y/sup 84/ are tentatively assigned as 5--. (auth)
Research Organization:
Tokyo Univ.
Sponsoring Organization:
USDOE
NSA Number:
NSA-16-031184
OSTI ID:
4765420
Journal Information:
J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 17
Country of Publication:
Country unknown/Code not available
Language:
English

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