ar X iv : n uc l - th / 0 10 40 36 v 1 1 1 A pr 2 00 1 Fast nuclear rotation and octupole deformation
نویسندگان
چکیده
The 150 Sm nucleus has been studied to high spins in a measurement of γ radiation following the 136 Xe(18 O,4n) 150 Sm, compound-nucleus reaction at beam energy of 76 MeV. The measurement was performed at NBI Risø using the NORDBALL array. Alternating parity, s=+1 band in 150 Sm 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 150 Sm above spin I=22, as predicted by calculations. Other explanations, assuming continuation of the s=+1 band past the two alignments are also discussed.
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