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Abstract:
The high spin states of 143Nd have been studied in 130Te(18O,5n) reaction at a beam energy of 80MeV. Based on delayed γ-γ coincidence,γ ray angular distribution,and γ ray linear polarization measurements,a high-spin isomer in 143Nd was identified for the first time with a measured half-life of (35±8) ns and Jπ=49/2+. The characteristic of the high-spin isomer in 143Nd was stressed with a deformed independent particle model. The model assigned a stretched configuration of [ν(f7/2h9/2i13/2)π(h2 11/2)] to the 49/2+ isomer in 143Nd As the isomers in the N=83 heavier isotones,the occurrence of the 49/2+ isomer in 143Nd can be interpreted to be caused by the sudden change in nuclear shape along the yrast line.
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