Experimental Study of High-Spin States in Deformed Odd-Odd 180 Ir

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ZHANG Yu-Hu. Experimental Study of High-Spin States in Deformed Odd-Odd 180 Ir[J]. Chinese Physics C, 2002, 26(6): 582-588.
ZHANG Yu-Hu. Experimental Study of High-Spin States in Deformed Odd-Odd 180 Ir[J]. Chinese Physics C, 2002, 26(6): 582-588. shu
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Received: 2001-07-15
Revised: 1900-01-01
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Experimental Study of High-Spin States in Deformed Odd-Odd 180 Ir

    Corresponding author: ZHANG Yu-Hu,
  • Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan3 Chiba University, Inage-ku, Chiba 263-8512, Japan4 Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan5 Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki 305-0006, Japan

Abstract: High spin states in deformed odd-odd 180Ir have been investigated using the 154Sm (31P, 5nγ)180Ir reaction through the measurements of excitation functions at 150, 155, 160, 165 and 170 MeV beam energies, K X-γ and γ-γ coincidences at 160 MeV. A new level scheme composed of 5 rotational bands has been established. According to the band structure characteristics and the deduced in band B(M1)/B(E2) ratios, the quasiparticle configurations and spin and parity have been proposed to the observed bands. The neutron AB crossing is observed at hωc≈0.26 MeV for the π1/2[541]⊙ν1/2[521] and π1/2[541]⊙ν5/2[512] bands. This AB crossing frequency is close to that in the ν5/2[512] band of 179Os indicating the loss of intruder nature of the π1/2 - orbit. Gradual alignment gain in both the π9/2[514]⊙ν7/2+[633] and π9/2ν5/2[512] bands is observed which is similar to the low spin anomaly in alignment in the πh11/2,πd5/2 and πi13/2 bands of neighboring Ir and Re isotopes. Different alignment properties have been discussed in the framework of cranked shell model, and a larger quadrupole deformation is suggested for the bands with π9/2[514] orbit involved.

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