Digitale Medien
Springer
The European physical journal
174 (1963), S. 206-221
ISSN:
1434-601X
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract Co60m was produced by the reaction Co59 (n,γ) Co60m ; its decay has been investigated by scintillation spectrometers. The half-period has been remeasured yielding a value ofT 1/2=(10·35 ±0·20) min. The isomeric decay mainly leads to the Co60 ground state by a (58·6±0·6) keV transition. TheK-conversion coefficientα K= 41±3 and the total conversion coefficientα=47±3 indicate the transition to beM3 and the spin of Co60m to be 2+. Further Co60m decays by beta transitions to Ni60. The beta component (8·6±1·2)·10−3%, log ft=7·32 leading to a (2·16±0·02) MeV level has been measured for the first time. A second component (0·24±0·03)%, log ft=7·23 leads to the 1·33 MeV level. The 2·16 MeV level decays to the Ni60 ground state mainly by a 0·83–1·33 MeV cascade, in a few cases by a direct transition. The spin of the 2·16 MeV level is 2+. Zr90m was produced by the reaction Zr90 (n,n′) Zr90m . The half-period was measured yielding a value ofT 1/2=(0·83±0·03) sec. Zr90m decays in the following way: (77±5) % by a direct (2·31±0·02) MeV —E 5 transition to the Zr ground state and (23±5)% by a (132·5±1·5) keV-(2·18±0·03) MeV cascade detected for the first time in the isomeric decay. TheK-conversion coefficient of the 132·5 keV transition isα k=(2·2±0·3) indicating this transition to beE3 and the spin of the 2·18 MeV level to be 2+. The Zr90m -decay sheme is in accordance with the level sequence of Zr90 as measured in the Nb90 decay.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01381653
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