Signature Inversion Phenomena in the Rotational Bands of Odd-Odd <SUP>176</SUP>Ir

ZHANG Yu-Hu; WEN Shu-Xian; ZHU Li-Hua

Chinese Physics C> 2002, Vol. 26> Issue(5) : 445-449

Signature Inversion Phenomena in the Rotational Bands of Odd-Odd ¹⁷⁶Ir

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 Japan Atomic Energy Research Institute,Tokai mura,Ibaraki 319-1195,Japan3 Chiba Institute of Technology,Narashino,Chiba 275-0023,Japan4 Chiba University,Inage ku,Chiba 263-8512,Japan5 Department of Physics,Kyushu University,Fukuoka 812-81,Japan6 China Institute of Atomic Energy,Beijing 102413,China

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Abstract：
High spin states in ¹⁷⁶Ir have been investigated via the ¹⁴⁹Sm(³¹P,4nγ)¹⁷⁶Ir reaction through excitation functions, X-γ and γ-γ coincidence measurements. Four rotational bands have been identified for the first time and their configurations are suggested on the basis of the existing knowledge of band structures in odd-odd nuclei as well as the measured in-band B(M1)/B(E2) ratios. Among the four bands observed,the πh_9/2;νi_13/2 and πi_13/2;νi_13/2 bands exhibit an anomalous signature splitting. The signature inversion point is observed in the former at I_c=18 which is consistent with expectations;this signature inversion spin in the πi_13/2;νi_13/2 band may be larger than 25h.

References

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ZHANG Yu-Hu, WEN Shu-Xian and ZHU Li-Hua. Signature Inversion Phenomena in the Rotational Bands of Odd-Odd ¹⁷⁶Ir[J]. Chinese Physics C, 2002, 26(5): 445-449.

ZHANG Yu-Hu, WEN Shu-Xian and ZHU Li-Hua. Signature Inversion Phenomena in the Rotational Bands of Odd-Odd ¹⁷⁶Ir[J]. Chinese Physics C, 2002, 26(5): 445-449. shu

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Received: 2001-12-12
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Signature Inversion Phenomena in the Rotational Bands of Odd-Odd ¹⁷⁶Ir

Corresponding author: ZHANG Yu-Hu,

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 Japan Atomic Energy Research Institute,Tokai mura,Ibaraki 319-1195,Japan3 Chiba Institute of Technology,Narashino,Chiba 275-0023,Japan4 Chiba University,Inage ku,Chiba 263-8512,Japan5 Department of Physics,Kyushu University,Fukuoka 812-81,Japan6 China Institute of Atomic Energy,Beijing 102413,China

Received Date: 2001-12-12
Accepted Date: 1900-01-01
Available Online: 2002-05-05

Abstract: High spin states in ¹⁷⁶Ir have been investigated via the ¹⁴⁹Sm(³¹P,4nγ)¹⁷⁶Ir reaction through excitation functions, X-γ and γ-γ coincidence measurements. Four rotational bands have been identified for the first time and their configurations are suggested on the basis of the existing knowledge of band structures in odd-odd nuclei as well as the measured in-band B(M1)/B(E2) ratios. Among the four bands observed,the πh_9/2;νi_13/2 and πi_13/2;νi_13/2 bands exhibit an anomalous signature splitting. The signature inversion point is observed in the former at I_c=18 which is consistent with expectations;this signature inversion spin in the πi_13/2;νi_13/2 band may be larger than 25h.