Decay of Gd 161 64 (3.73 min)
1959; American Institute of Physics; Volume: 115; Issue: 1 Linguagem: Inglês
10.1103/physrev.115.174
ISSN1536-6065
AutoresL. C. Schmid, S. B. Burson, J. M. Cork,
Tópico(s)Nuclear Physics and Applications
ResumoThe decay of $_{64}\mathrm{Gd}^{161}$(3.73 min) is characterized by beta emission to excited states in $_{65}\mathrm{Tb}^{161}$. This activity has been investigated by means of the Argonne 256-channel scintillation coincidence spectrometer and photographic internal-conversion-electron spectrographs. Sources were prepared by neutron irradiation of Gd, enriched in ${\mathrm{Gd}}^{160}$, in the Argonne reactor, CP-5. The presence of three beta-ray branches is deduced; two of these were observed experimentally by means of absorption methods. Fourteen gamma rays are reported. These radiations are fitted into a decay scheme which indicates excited states in ${\mathrm{Tb}}^{161}$ at 56.6, 134.0, 315.3, 417.6, 480.6, and 586.1 kev. A rotational band, based on the ground state and including the first two excited states, is indicated. Spin and parity assignments are also suggested for the third and fourth excited states.
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