Identification And Study Of A High-Spin Isomer In Nd-143

The high-spin states of Nd-143 have been studied in Te-130(O-18, 5n) reaction at a beam energy of 80 MeV. Based on delayed gamma-gamma coincidence, gamma ray angular distribution,and y ray linear polarization measurements, a high-spin isomer in Nd-143 was identified for the first time with a measured half-life of (35 +/- 8) ns and J(pi) = 49/2(+). The characteristic of the high-spin isomer in Nd-143 was stressed with a deformed independent particle model. The model assigned a stretched configuration of [nu(f(7/2)h(9/2)i(13/2))pi(h(11/2)(2))] to the 49/2(+) isomer in Nd-143 As the isomers in the N = 83 heavier isotones,the occurrence of the 49/2(+) isomer in Nd-143 can be interpreted to be caused by the sudden change in nuclear shape along the yrast line.