Directional and Polarization Correlation Measurements onEu152m

Abstract

The spins and parities of the 1511-kev level in ${\mathrm{Sm}}^{152}$ and the 1315-kev level in ${\mathrm{Gd}}^{152}$ are discussed on the basis of directional correlation and polarization-direction correlation measurements on the 1389-122 kev and 970-344 kev gamma-gamma cascades, following the decay of 9-hour ${\mathrm{Eu}}^{152m}$. Both levels have been assigned spin and parity $1^{-}$. In order to check the apparatus on cascades known on the basis of previous measurements, directional and polarization-direction correlation measurements have also been made on the 842-122 kev (from 9-hour ${\mathrm{Eu}}^{152m}$) and 1409-122 kev (from 12-year ${\mathrm{Eu}}^{152}$) cascades in ${\mathrm{Sm}}^{152}$.