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SHORT-LIVED ISOTOPES OF Nb AND Zr FROM FISSION

Journal Article · · J. Inorg. & Nuclear Chem.
;
The nuclides Nb/sup 98/, Nb/sup 99/, and Zr/sup 99/, plus three other shortlived beta -emitters tentatively identified as Nb/sup 100/, Nb/sup 101/, and Z/sup 98/, were observed in the Nb and Zr fractions separated from U/sup 235/ fission products. The properties observed are as follows. Nb/sup 98/: t/sub 1/ 2/ = 5l.5 plus or minus l.0 min; E/sub gamma / (Mev) = 0.330 plus or minus 0. 0-720 plus or minus 0.010, 0.780 plus or minus 0.0l0, 1.l6, l.44, l.52, l.68, l.88, l-93, 2.24, and 2.7; E/sub beta max=3.l plus or minus 0.2 Mev; Q beta / =4.6 plus or minus 0.2 Mev. Nb/sup 99/: t/sub 1/2/ = 2.4 plus or minus 0.3 min; E/sub gamma /(Mev) = 0.l00? 0.002. 0.260 plus or minus 0.005. Zr/sup 99/: t/sub 1/2/ =35 plus or minus 5 sec. Nb/sup 100/: t/sub 1/2/ = 3.0 plus or minus min; E gamma (Mev) =0.l40 plus or minus 0.005, 0.360 plus or minus O.OlO, 0.450 plus or minus 0.0l0, O.53O plus or minus 0.010, 0.65, 2.2, 2.3, 2.65, and 2.8. Nb/sup 101/: t/sub 1/2/= l.0 plus or minus 0.2 min. Zr/sup 98/: t/sub 1/2/ approximately l min. A search was made for a low-spin isomer of Nb/sub 96/ by rapid beta - and gamma -counting of Zr samples which were bombarded with 3.0 to 5.5 Mev protons. No activity attributable to such an isomer was observed. The low-spin isometric state, if it exists. has a half-life less than 5 sec. (auth)
Research Organization:
Los Alamos Scientific Lab., N. Mex.
NSA Number:
NSA-15-002176
OSTI ID:
4129218
Journal Information:
J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 15
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

BETA DECAY
BETA PARTICLES
FISSION PRODUCTS
GAMMA RADIATION
NIOBIUM 100
NIOBIUM 101
NIOBIUM 98
NIOBIUM 99
NIOBIUM ISOTOPES
PHYSICS
PROTON BEAMS
RADIOISOTOPES
URANIUM 235
ZIRCONIUM 96
ZIRCONIUM 98
ZIRCONIUM 99
ZIRCONIUM ISOTOPES