Shape implications of unhindered ${\frac{11}{2}}^{-} \to {\frac{11}{2}}^{-}$ $β$ decays in the region with $N < 82$ and $Z > 50$

Publisher Website

1 December 1975

journal article
research article
Published by American Physical Society (APS) in Physical Review C

Vol. 12 (6) , 2111-2114
https://doi.org/10.1103/physrevc.12.2111

Abstract

Unhindered

{\frac{11}{2}}^{-} \to {\frac{11}{2}}^{-}

β

-ray transitions with

log ft

values of 5.0 to 5.4 have been observed in the decay of

{}^{139}{Eu}

,

{}^{139}{Sm}^{m}

,, and a new isotope

{}^{135}{Pm}

. These transitions show no noticeable retardation and are not "shape forbidden." The shape of

{\frac{11}{2}}^{-}

states with odd

N

is not very different from the (prolate) shape of adjacent

{\frac{11}{2}}^{-}

states with odd

Z

.

Keywords

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