Winkelkorrelationsmessungen an >30y Holmium 166 und Bestimmung desgR-Faktors des 4+-Rotationsniveaus von Erbium 166 View Full Text


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Article Info

DATE

1963-09

AUTHORS

E. Gerdau, W. Krull, L. Mayer, J. Braunsfurth, J. Heisenberg, P. Steiner, E. Bodenstedt

ABSTRACT

The spins of several excited states of Er166 have been investigated byγγ-angular correlation measurements. The spin sequence 0+, 2+, 4+, 6+ for the ground state rotational band was presumed to be correct. Unique assignments were derived for the states of 1076 keV, 1377 keV and 1785 keV asI=5, 7 and 6 respectively. These results are in agreement with the spins proposed byGallagher jr. andSoloviev.The multipolarities of theγ-transitions of 408 keV, 709 keV, 811 keV and 831 keV were derived as 95%E1+(5±1)%M2, 99·6%E1+(0·4±0·5)%M2, 99·1%E2+(0·9±0·3)%M1, and 96·1%E2+(3·9±1)%M1 respectively. The unusual mixing ratios of the transitions of 811 keV and 831 keV can be understood as a consequence of theK-selection rule.Eachγ-transition from the 1785 keV state should be stronglyK-forbidden and one expects a half-life ofT1/2≈3·10−9s. A measurement of the time spectrum of the coincidences between theβ-radiation and the high energyγ-lines gave however:T1/2(1785 keV state)≦3·10−10s.The rotation of the angular correlation between the 184 keV line and theγ-group at 820 keV has been measured in an external magnetic field of 53000 gauss as:ω·τ(4+)=0·083±0·006.This value contains small corrections for an additional rotation of the angular correlation of the 831 keV–184 keV triple cascade in the 6+state and for a small attenuation by internal fields.WithT1/2(4+state)=1·23·10−10s, andβ=7·08 one gets for theg-factorgR=+0·266±0·024 in good agreement with recent results for the 2+ state. More... »

PAGES

389-404

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01378614

DOI

http://dx.doi.org/10.1007/bf01378614

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001005486


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