  The 150Sm nucleus has been studied to high spins in a measurement of gamma
radiation following the 136Xe(18O,4n)150Sm, compound-nucleus reaction at beam
energy of 76 MeV. The measurement was performed at NBI Riso using the NORDBALL
array. Alternating parity, s=+1 band in 150Sm has been observed up to spin
I=22. This band is crossed by two aligned bands, corresponding to a
reflection-symmetric shape. After the second crossing the s=+1 band ends
abruptly, suggesting that the octupole shape vanishes in 150Sm above spin I=22,
as predicted by calculations. Other explanations, assuming continuation of the
s=+1 band past the two alignments are also discussed.
