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 Ris{o} 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.

PACS numbers: 23.20.Lv, 21.10.Re, 27.60.+j